Best 200 tread wear auto x tires
 

I have a set of 18s for an 08 C6 Z06 and a set of factory rims for my car (18 front and 19 rear). What would be the best recommended set of tires I could run for autocross as far a 200 tread wear rating is concerned? Also considering to just slap scrubs on the 18s and run them in autocross and then in road courses. I mostly participate in road courses but I'm trying to do autocross to just to get more seat time.

Either the BFG Rival S, or the Bridgestone RE71-R. I’ve run them both on my 2011 Grand Sport for SCCA AS Autocross. I do prefer the RE71-R, but with those you are currently limited to a 305/30-19 rear tire. Rival S also comes in that size, but if you move down to an 18” rear, you can get the 335/30-18 Rival S, which is good at putting down power. Both have the 275/35-18 fronts.

Chris

Bridgestone RE-71R or BFG Rival S

Rivals

the RE71s dont come in mens sizes

I’ll gladly give up the 30mm in the rear to run the ‘Stones, didn’t care for how much longer the Rivals took to get up to temp especially when cooler. Also didn’t like how soft the sidewalls were, though have not run the 1.5s yet to see how much they help with steering response.
https://www.beyondseattime.com/bfg-r...re71r-round-2/

I dont think there’s any fast 200 TW for the widebodies in 19”. Better off using the 18’s for autocross and using 19’s for track tires since you can get NT01’s or R888r in that size.

I tried a couple of setups as tires wore out and got replaced during last years autocross.

275 RE71/325 RE11 was such a mismatch. It was a snap oversteering son of a gun. Do not recommend at all. Push the front end 75% and the back would come swinging around. Bought some 18 wheels to run Rivals after that.

275/335 Rival S huge improvement over the RE11’s which isn’t a surprise. It was better all around but still understeered. It got better as it warmed up, but temps in the 30’s meant they never got to operating temps.

275 RE71/335 Rival S this setup actually worked really well in the 30F weather. Car was very well balance, with slight midcorner understeer if you had to much steering angle that was easily correctable. This setup got me the fast time of the day which I was shocked as I easily beat out the usual fast guys (Elise w/ RE71 & S2000 CR w/ RE71).

The first autocross for my area this year is in 2 weeks. I’ve got 315 Rival S 1.5 fronts and 335 Rival S rear for this year. I will update after said event.

Size for size, I would give the RE71s a nod. But I still have to see what the difference is with the wider Rivals. I would expect the stiffer Rival S 1.5 with 40mm more tread on each tires would make the difference and than some.

Here's a test Vivek did.

https://www.beyondseattime.com/bfg-r...re71r-round-2/

What size wheel were you running on you Rival/RE71 testing.
What size whee are you getting for the 335/315

Will be very interested in your experience/data on this.:thumbs:

:cheers:
DH

i think every single vette and camaro in the Optima series runs the rivals.........................

Interesting you say that about the RE71/11 combo as buddy won regional AS class last year in both autocross and time trials with that set up on his C6Z. I’ve ridden with him on track too, only difference is he ran 285/30s up front.

Set FTD at last event of the year with other buddies CAM-S GS on square 335s, but don’t think that would have been possible in the cooler temps had we not been co-driving and used blankets. I do plan to buy a set of 1.5s for my 18” wheels to run for time trials, but plan to use the RE71Rs for autocross still.

Some are on 19" wheels and RE71s. Its pretty comparable even at the narrower width. Not sure how the Rival 1.5 will stack up yet though.

BFG just added the 305/30-19 and 275/35-19 Rival S v1.5 to the line up.

Good question, shouldve added that.

Fronts:
275 RE71 are OEM 18x9.5
275 Rivals were on 18x10.5
315 Rival 1.5 are on 18x10.5

Rears:
325 RE11 on OEM 19x12
335 Rivals on 18x12

The drawback of the square 305mm 19” set up on the road course is the mass is further from center of rotation and being taller hurts gearing slightly over 335 18”. The 1.5s are just a different carcass is my understanding, so not sure they’ll be any faster as the compound hasn’t changed right?

Thanks. Now even more interested in your 315/335 Rival results. I am considering the 10.5/12 inch instead of the 11/13 which seems more common.

:cheers:
DH

Heres the 315 on 10.5
Attachment 48348460
Attachment 48348461

That’s interesting. I let another driver that is a usual suspect for FTD drive my car and warned him about the oversteer. He spun it on both laps he attempted.

Wow, how old are the tires? What’s your suspension setup/alignment? Tire pressures?

I ran the Rivals (315 on 10.5&335 on 12) on my CAM-S C5 FRC before getting C6GS, have also ran 275&295 square setup, as well as R comps in the rear and 200 treadwear up front which people have freaked out about yet never have spun or put more than 2 wheels off. Driving styles of course affect results, but playing with tire psi can also affect how a car handles as well as sway bar/shock settings so to say don’t run this particular combo as it’s undriveable seems odd to me without providing more details. My buddy who’s last year’s BS national champion tested 275/315 Rivals yet chose 275/285 RE71Rs for the win, everyone who trophied at nationals in BS were on ‘stones iirc.

The RE71 were pretty new, like 90% tread left at the least the RE11’s were probably in the wear (definitely past the wear bars after lighting them up). Stock C6 suspension. I was used to have nothing but understeer on entry/midcorner with RE11 on the F/R so it was a very sudden change.

This was the before measurements when I took it in for new alignment after installing coilovers this winter, so they maybe a little bit skewed. Front camber was -1.2, toe -0.15, rear camber 1.3, toe -0.10. Front pressure 38 hot/rears i think around 34?

ive run the rivals 315 square on 10.5s. worked fine. no bulge or wallowing.

but grew tires of having to tip toe threw corners, and wait so long on exit to get on power.
now running 315/335 rivals on 11"/12" ive even run the extra wide R888R 335s on 12" rears.
no doubt 13" would be better, but my spoke style i wanted was only available in 12" for some reason from forgestar :(

[QUOTE=ttx350z;1599246029]Heres the 315 on 10.5
Attachment 48348458
Attachment 48348459[/QUOT]

Well that looks like it will clear the fender lip. At last weekends AutoX another Z06 had the 315 on an 18x11 and he was rubbing ..... even after telling me he sanded the fender lip down after previous event.
What offset is that?

:cheers:
DH

The wheels themselves are 18x10.5 +56 (C5Z wheel spec) with a 12mm spacer so its effectively +44. I’ve got a 20mm spacer on the way since i slightly touch the wheel well housing at full lock. Just seeing if I can eliminate it. Real world driving on the road it doesnt touch.

Edit: that pic is with -2.3 camber

Sounds like the 71s were fresh and the 11s were possibly heat cycled out? Saw you’ve added a lot of power and aero in your profile pic so was curious as to what all mods you had done, if you had fresh 11s in the rear it might have been more balanced I’m thinking. It’d be like putting R compounds up front and street tires in the rear, that would be a very tail happy combo and one I wouldn’t recommend.

The 11’s were close the end of their life. I definitely accelerated wear with all the spins and drifts. The Rivals I put on where actually a used set if takeoffs since i just wanted a cheap set to try for the last 2 events of the year. The Rivals were close to what the 11’s wear wise when I put the 71’s on.

Mods is just cam, headers, fixed heads, msd, halltech, nw102. Aero mods were ZR1 splitter and side skirts.

https://cimg7.ibsrv.net/gimg/www.cor...cbd0c67217.png
Here’s yesterday’s results where he placed 4th in PAX out of 157 with the discontinued RE11s on the rear. It still has stock shocks, sway bar and no harnesses.

Stop showing off my slow 9th place finish on here Chris! I had a fast raw time atleast ....

Haha, you did and enjoyed a front row seat to your great driving! Thanks again for the ride, looking forward to hearing your feedback on the 1.5s once you run them. Hopefully I can break into the top 10 like you guys one day, haven’t gotten below 13th in BS, CAM-S or AS

I'm thinking about going with the bfg rivals. 315 30 18 and 345 30 18. Should be rather interesting to see how they handle.

The rear will be a 335/30-18 as a 345 does not exist. They will handle very good though for a street tire, lots of us do various 200tw race series on them (Optima, etc.)

Just finished up my first weekend with brand new still shiny 315 Rival S 1.5 on 18x10.5" front and (well worn used) 335 Rival S on 18x12" on the rear. On Viking coilvers 550 front/700 rear. Event is ran on a concrete pad that's used as a truck stop.

I have very limited experience with the Rival S on the front (275 on a 10.5" wheel) for like 8 runs in mid 30ºF weather.

I'll be referencing OUSC competitor Brandon Williams R35 GTR (335 Rival S squared/700+AWHP) quite a bit since he's got competitive experience and fleming23 should know who he is since they've competed in the same event before.

So Day 1, it was freezing. It was cloudy and snowing during registration with some moisture/puddles on the ground. Temps where in the 30's until about 1 pm. Of course I got shafted and was in the first run group. First heat was pretty much a lost cause as nobody could get their tires warm. Guys with RE71R's in second run group were only getting 60ºF tires temps after their hot laps. There was no grip at all. So not much to report on. The co-driven GTR was 1/2 after the first heat.

After lunch break, it warmed up into the 40's. Grip improved a little bit but there was still no grip for turn in. RE71's were just getting to 80ºF for the second run group. I ended up like 5th raw/pax time. Behind a shifter kart that set FTD, the GTR with both driver, 2 Miatas with RE71R's. Due to the weather and only 16 cars showing up, we finished early so we reconfigured the course to start another "event" it was about 45º at that point and a little overcast. I was able to set the second fastest time behind Brandon's GTR.

Day 2, it was 35ºF at the start of the first run, but sunny and no snow. Of course I was in the first run group once again. The main competitors on 71R's and the co-driven GTR was in group 2. The slightly warmer conditions made a huge difference. Turn in didn't just understeer into oblivion at 20mph like the previous day. I had the fastest time posted for run group 1, up on the GTR driven by the codriver .1 sec. I was in 4th at the lunch break, 1.6 seconds off the GTR with Brandon driving in group 2 with the same 2 RE71R shodded miatas ahead of me. Heat 2, warmed up and I was finally able to get a feel of what the car could do. Front end felt great, tires felt stiff and did not feel any sidewall flex/wallowing even mounted on the 10.5" wheels. Visual inspection after the weekend didn't show any signs of the sidewall rolling over and rubbing the ground. I didn't feel like I had any issues with precision as I was able to place the car where I wanted. I came into the weekend expecting it to have oversteer, but I'm happy to report that there was no snap oversteer on turn in or midcorner. Car was very neutral even around high speed (60 mph) sweepers, pulled 1.28G's according to the HUD and would scrape the airdam. Power delivery on exits were great and uneventful in second gear, wheelspin was easily managed even though the tires are at the end of their life. I'll probably do one more weekend with those rears before I get the new set mounted. At the end of the day, I finished 2nd in raw and PAX only behind the GTR with Brandon behind the wheel. I closed to gap considerably to finish .2 secs behind in raw time. I know it doesn't count, but I took off another .4 secs off my time during buck runs at the end of the day. So the cars potential is there, I just have to get up to speed quicker myself.

Times are based off of memory and it's been a long weekend. I'll post the times when their available.

On another note, the 315 on 10.5" +36mm wheels had ZERO rubbing at all. No rub while staging, hairpins, fully compression sweepers, nada, zilch. I know it's something people will deal with if they rub, but this is still sort of a daily car to me.

Great report. Thanks for all the info. :thumbs:
Do you think there would still be no outside fender rubbing with stock suspension vs your coil overs.

:cheers:
DH

I don't think it'll rub the fender with stock suspension. Now that the shoulders are worn, there'll be even more clearance.

I'm seeing recommendations in forums for re71r 275-35-18/305-30-19 with a slight edge to the rivals 275-35-18/335-30-18. Stock wheels in AS. Any reason not to use the re71r 285-30-18 up front? I assume they would be close in performance with slight edge to the 285. And if South Florida heat would favor re71r or rivals?

I’ve tried both the Rival S and RE71r in the sizes you list. I do prefer the RE71r for better feel and steering response. But high heat is better for the Rival S. They need some heat in them to work well, and the RE71r works better cold, but can get a bit greasy when hot. So you may like the Rival S better most of the year.

I have not tried the 285s up front because I think they are too short, but it’s possible they will work OK.

To support this statement, I have been working with a guy that won a national championship in a C5. His experience supports this, the RE71 are faster from the first run, but as temperatures build, he was noticeably faster with the Rivals. He runs Rivals for this reason, and because he can get contingency sponsorship to get free tires.

The first thing I would do is evaluate what temperatures you expect to be running under. If its typically 60 deg and cooler, I would go RE71, as getting heat into the Rivals is tough. If its warmer, I would go to question 2, tire sizing. I run Rivals 315 square, and in the first few events of the year I struggle to get any heat into them in the small courses we run. I am thinking of getting a set of Re71s in 285 square just to help them warm up faster and also get a co-driver to help warm tires.

At the end of the day, these tires are really good, and people can win on either one.

I assume you have to be running wider fronts to go 315. Vs the stock 9.5s. also wonder if running rival 275/315 would improve balance, less understeer, help rotation.

Im running a C4 with Forgstar F14s, 11" wide square. Running a 275 front would be more understeer then a 315 front. But maybe your not comparing the 275 to the 315?

Ya, i want to run the stock 9.5/12 rims. Was thinking maybe running 275 front 315 rear for better balance/rotation instead of 335 rear. Not sure if it will be faster overall though. Wondering what combination they're running at Nationals. I could see the top spots c6z have BFG.

Not new to autocross but will be new to the Vette. Hense some of the newbie questions.

I went with the shorter 285/30 up front since it keeps the ratio the same and lowers center of gravity with the 305/30 being shorter.

I agree hot temps with a co-driver on a grippy concrete surface and the new Rival 1.5s will be as fast and feel great I imagine, if it’s cold and your a solo driver in a big field on asphalt then I’m betting on the RE71R being faster.

Have you used the 275 before too, how does it compare?

I have not on the C6GS, but did on the rear of BS C5FRC and honestly don’t think contact patch is much different on a 9.5” wheel though as the 285 is squeezed.

If you're not opposed to running different brands, run the 71R's on the front with the 335 Rivals on the back. That worked better then the 275 Rivals and would still allow you to run the wider rears. Temps were 35ºF when I compared both setups though.

Not sure what your location is. If you were a local, I'd let you try that combo.

I've considered that too, it's tempting. Running looser tires in the rear hasn't worked great for me in the past. Although these would behave more similar. I've been reading about how differently they behave. Re71r grip right away and fall off as they get too hot. Real hot in South Florida. Then the rivals need to heat up for optimum performance. They seem to behave oposite. It's probably too Minor to really matter but that has me on the fence on which direction to go. Re71,rival,or combo. Down here we run in groups of 3-4 runs at a time with about 10 min between runs in the morning and again in the afternoon. Even though it's hot I'm leaning towards the re71 285/305 to start and maybe try something else the following year. I don't think they will get too hot and greasy with those limited runs.

The 335 Rivals wont be loose on the rear paired with the 71R’s on the front. It still had an understeering bias even in the cold. The Rivals are to the point where the wear bars are almost gone compared to like 80% new 71R’s

Managing hot tires is easier than cold tires. You can get a water sprayer and spray your tires between runs if they get to hot.

I’m considering trying that setup myself this summer as I picked up some used 335s.

Results from my first Pro Solo this past weekend, only Vette faster on the right side course was Vivek by .3 Had a .499 redlight on the left side, then the asphalt course got greasy in the hotter afternoon and the next morning it was wet for the final heat. Had the fastest 2.1 60’ out of the Vette’s with my Grand Sport and wasn’t doing a burnout even though it’s allowed before the run. Temps were ~80, 90 and 70 for the respective heats, hope that helps. Porsche’s with their launch control and PDK we’re cutting 2.0 60’s
https://cimg7.ibsrv.net/gimg/www.cor...fc70db5830.png

What he said!

... Unless you are in very hot temps and can handle the vague feeling of the Rivals. If you are trying to be ultra competitive the Rival S is the way to go in hot temps but will not "switch on" quick enough in cool temps. I use RE71 in spring, switch to Rival in mid summer, then back to RE71 in fall. I like the feel of RE71 much better, they inspire more confidence, but in very hot temps they get over heated and greasy after a run or two.

If you have the money/space for 2 sets of track tires, this is the way to go.

So, what a lot of folks don't know is that the Rival 1.5, while the same compound as the 1.0 is a very different construction and what was maybe the "right" deal before for setup may not be now. Made more complex by the fact the old one was pretty good out of the box, the new one takes a lot more heat cycling to get good, kind of like the RE71R. So beware. And I stay on top of this stuff pretty well. Also there is the new Yokohama which seems to hold some promise too, though not seen them much on any big car, but what they are doing on smaller cars is typically what we want (like better power down) in the higher HP RWD stuff.

Just did a test and tune with a STS Miata prepping for nationals. They tested RE71, Rival S 1.5, AD08R and A052. Ambient temp was mid 90’s and track temp was 120+.

In order of fastest to slowest for multiple drivers.
A052
Rival S 1.5
RE71R
AD08R

The A052’s ran consistent times 5 runs in a row, tread temp reached 160 with no dropoff in lap times. The tread didn’t get gummy or melted like the way Rivals/RE71R’s do at 140. They also commented that launching at 5K with Rivals would spin them, but they needed to launch at 6K with the A052’s, since they hooked that much better on launch.

They look really good and I want to try the 295/30-18 on my fronts when my 315 Rivals wear out.

What was the Delta if you don’t mind sharing?

Rode in last year’s BS national champion 1M initial test run on the Yokos at the last local event and was impressed, he just won the Topeka Pro Solo on them so they seem to be working.

The 2 fastest drivers were .2 secs faster with the A052 than with the Rival S 1.5 on a roughly 28 second course. It was a shorter course since it was geared more for car setup to remove/minimize as much driver error as possible.

Also, the Rival S 1.5 were 225 and the others (71R, A052, AD08R’s) were 205.

As you can see tires are/were sticker and not worn out. AD08R’s werent originally part of the test, a Civic driver offered them up for comparison.
Attachment 48347215

So the best fastest Corvette tire is the bfg rivals...

I think more testing of A052 needs to happen first to see if they do better than the rivals in hot and cold before making that statement, but in the heat it may be splitting hairs between 275/335 Rivals, 265/315 A052s and 285/305 RE71Rs. Could be reverse order when cold though, I didn’t like the mixing 285 RE71Rs and 335 Rivals at last event fwiw.

Do they come in Corvette sizes? 275-315 and 325-345

315’s are the widest they come in. I’ve got 10.5” front wheels so the 295 is the perfect fit for it, so I should gain some better front end feel by not having pinched tires.

The fastest time the Rivals ran on the STS Miata was a 28.1xx which came on lap 3 I believe. The very first lap on the A052 was a 28.1xx, keep in mind if was the first first time the driver used the A052. By the third lap, he ran a 27.9xx. He was within .1 sec for laps 4/5. We checked tire temps and it was 160F. We sprayed the tires and the codriver took it out for 5 laps and beat his fastest Rival time by .2 and all 5 laps where consistent. Tires looked amazing in terms of wear at 160F. I can see why the A052’s are banned for CAMS.

What was the issue? I have that combo and love them. Only done 2 AutoX so far but 4 more coming up before end of August.

:cheers:
DH

Yeah, the 295s are 11” wide tread width.
I didn’t know they were banned from CAM-S???

It was a low grip surface and wasn’t necessarily horrible just not as precise, but definitely more tail happy for the first bit of each run till the rears got some heat in them as I didn’t have a co-driver and we have large heats in Texas with 167 total entries.

I’ll probably still try them anyways since i’m just doing regional stuff. And they arent banned from other events like Gridlife, Optima, street machine summer nationals, etc. https://dk1xgl0d43mu1.cloudfront.net...pdf?1543873785

Wow, sounds like they’re a faster tire if banned...

They were previously banned because their mold depth wasn't deep enough. They have since changed the mold and are molding them to the required starting depth to be legal. I wouldn't be surprised if they got made legal for next season in CAM.
If I remember correctly, the 295/315 Yoko combo has the same footprint as the 315/335 rival combo and is 2-3lbs per tire lighter. It'll be interesting to see what happens.

The 295/315 A052 setup would save 18 pounds of rotating mass vs the 315/335 Rival S. You’d lose a total of 1” of tread width on the front and .4” on the back. Seeing as how I was pinched on the front anyway, I wouldn’t be losing any noticeable tread.

https://cimg8.ibsrv.net/gimg/www.cor...24c66543b.jpeg
Yes, they changed to 7/32” to be legal as advertised in the SCCA magazine now. Doesn’t say anything about not being legal in CAM-S though I guess it isn’t a real class technically.

https://cimg0.ibsrv.net/gimg/www.cor...25db91c838.png
https://cimg1.ibsrv.net/gimg/www.cor...fc916135a2.png
https://cimg2.ibsrv.net/gimg/www.cor...be8b2c3b4d.png
https://cimg3.ibsrv.net/gimg/www.cor...c399983d0c.png
I’m seeing 14lbs total weight savings, only .2” narrower front and .2” narrower in the rear.

https://cimg2.ibsrv.net/gimg/www.cor...ed008d1a82.png
Except that the CAM rules say they aren't legal. Unless it's been announced somewhere that they are now legal.

I saw that in the link provided earlier, was the first I’d heard. Just don’t understand why they’re clearly legal in street classes, but not in CAM classes?

Ohhh I was looking at the Rival S 1.5, they’re heavier and different tread width. Either way, the A052 is quite a bit lighter with minimal tread width loss.

Because the regular SCCA is a little faster to move on allowances or changes than CAM. One thing I've noticed is once the rules are finalized in CAM then that's that for the year. That's why I said don't be surprised if they are deemed legal next year.

My main question, if in fact they were illegal because of tread depth then that doesn't make sense because tire shaving is legal, so whats it matter?

https://cimg9.ibsrv.net/gimg/www.cor...48b04ad490.png
https://cimg0.ibsrv.net/gimg/www.cor...339db8dee8.png
You’re right the 1.5 is 1lb heavier over the RivalS because of the stiffer construction, 335 is the same width though 315 is .3” wider

What would you think about using the 295/30/18 instead of the RE71 285/30/18 on 10 inch front wheels and keep the 335/30/18 Rival on the rear. Right now I am very happily with the RE71/Rival combo that you had recommended before. :thumbs:

:cheers:
DH

Thats what I want to try when my front Rival S 1.5 wear out. Not sure about you, but my fronts are taking a beating in autocross, so the better hot temperature consistency and durability from initial testing looks appealing. If they run same time and have the same balance with better wear, i’d be extremely happy.

I have 50 runs on the set up so far. The rear rivals are wearing perfectly. The front RE71 are wearing even except for the outside of the driver side is worn to not tread on outside 1.5 inches while the passenger still has tread on the outside. I don't know if this is from a preponderance of clockwise turns or my alignment being off. I only weight 150lbs but next alignment I'm going to have weight in driver seat. I plan on flipping the fronts after next couple of events to get the most out of these RE71.

So I'm counting on you to do all the experimenting and getting the empirical data when its time to replace the fronts ...... :rofl::cool::D:rock::thumbs::thumbs:

:cheers:
DH

Both of my inside shoulders are wearing really fast. I’m sure my alignment is thrown off quite a bit. I need to invest in some monoball or delrin bushing before I get tires. Here’s what my front UCA bushings look like.
Attachment 48347154
Attachment 48347155

Well my bushings are the original OEM. Car has 70.5K miles and built in 12/2005. But I like my bushings:D

09 with like 71k on mine. They were fine until this year when I got an aggressive alignment and sticky tires.

It's not that little bit of bushing walk that is causing the uneven L/R wear. It's more likely other factors. Alignment, corner weighting, driving style, dominant course direction, etc...

What are all your alignment specs?

Results from yesterday finishing 6th in PAX, even beat the raw time of the two CAM-S Grandsports on square 335s Rivals. If I hadn’t coned away the 42.8, I would have been 2nd overall in PAX.

https://cimg1.ibsrv.net/gimg/www.cor...b75e00e472.png

Yeah, yeah, keep bragging Chris. We both know I'll get you when we are back on the bus lot! :toetap:

Haha I don’t expect to beat you or Anthony on a regular basis, but when I do I’m gonna talk about it :D

And I expect to beat y’all on the bus lot when it gets colder, unless y’all gang up on me and co-drive or get tire warmers;)

Reconfirms my findings during my test and tune that the A052 were .2 seconds faster than the RE71R and Rival S 1.5 and the huge longitudinal grip. Interesting to note that the A052 has so much longitudinal grip, that it made the car understeer, looks like going with slightly narrower 315's vs 335 Rivals for the rear wont be a hindrance.

Tire Rack's review of the A052, Rival S 1.5, RE71R, Direzza ZIII. Tire Rack tested the A052's and were .2 and .3 seconds faster than the RE71R's and Rival S 1.5 on a 29.X second course.
https://www.tirerack.com/tires/tests...y.jsp?ttid=242

I am thinking of getting into the AS with c6 z06. Looking at getting the 18 inch forgestars. From what I am reading 18x9.5 and 18x12 are the right sizes (must keep stock rims width sizes for AS, but can put as big a tire you can fit) with rival 1.5s 275/35/18 and 335/30/18 tires. I could also option for the RE-71R 275/35/18 or 285/30/18 front size.

If anyone has a set of these forgestar F14s that clear BBK for c6 z06 in black I would be interested in buying.

Well you did beat me in raw time, but I still got you covered in PAX with my pizza cutters lol and with Tom now on the 305 RE71R rears he beat us both...
https://cimg7.ibsrv.net/gimg/www.cor...5c693f892c.png

I can easily build those for you. I know all the details, done lots of them. You might find a set for sale, but it's rare, as most sets aren't AS/SSR legal and most that have them, use them.

Let me know if I can help. No sales tax in most States.

So yesterday we had a local event mean Washington DC. That's not really look what I mean but it's my region of record and I run there a fair bit. There are also quite a number of other top national kind of folk that run there. The results are going to be pretty messed up because when you run non-comp runs your name disappears from the official result since they don't count.

there's pretty much one other guy in Miata who's fast and I didn't really see what he was running. However, I ran three cars. 2 C7 Grand sports that I set up, one in super stock trim on Goodyear supercar 3s. My car and SSR trim on Hoosiers. And a street mod RX8 (with big stranoparts.com stickers on our, because I have a lot to do with it) with a 2.5 turbo that I suspect is going to quickly become one of the top cars in the class.

Not counting Brian Karwan, who's time I don't know. I do know that I ran the street tire C7 first and those tires made a lot of noise, but seemed to be to be really good. It wasn't until after I ran the other cars that I knew more what was what.

I've already done the math but you guys can probably quickly figure it out. :)

C7 in SS trim. 47.1
C7 in SSR. 45.3
SM RX8. 44.9

So there might be a fourth player. It's a good thing the Street tire stuff makes everything easy. Bottom line You're going to need a test, probably more than once. But based on this result on a site I know well unless the good years do not react well to concrete, which ironically some of these tires already don't, might be a damn good choice especially because there's tires that actually fit the stock wheels.

just a reminder I do carry tires. Lots of places to do and I'm competitive with the big guy you tend to think of in terms of price. But I'm also deeply involved in this stuff on a weekly basis And get a lot of opportunities to try a lot of different things more than the average guy answering the phone somewhere. Unfortunately people often want absolutes, and there are never absolutes especially more talking about racing. But I can definitely help with information to help make the decision, and to even supply the tires.

Tom is just a crazy man. To be able to beat him in PAX, I would have had to run a 40.08! I needed a 39.99 for 1st. No way either of those were happening yesterday!

Does that make 3 top 10 PAX finishes in a row for you? And you thought you weren't good enough! :rofl:

Yeah, really impressive that his suspension is all stock too.

Nah just two, think I’ve got the shock setting and fuel load figured out on the GS though and looking forward to trying to make it 3 in a row though.

Good news, my front 315 Rival S 1.5 are worn out so I threw on some 275 Rival S I had sitting around. They are so much slower than the 315’s. I checked Tire Rack and surprise, they had fewer then 3 of the 295/30-18 A052’s in stock. I ordered a set and they should be here on Thursday. Next autocross for me is in 2 weeks. My rear 335 Rivals still have plenty of tread, so I’ll be using 295 A052 fronts with 335 Rival S on the rear. I’m still planning in going to 315 A052’s on the rears when the Rivals wear out.

Not sure if anyone local to you will care, but the A052's are on the exclusion list for CAM still. Just a heads up.

Great. Will look forward to your review.:thumbs:

:cheers:
DH

Thanks! None of the locals in my club care. They encourage it because they think it’ll be legal next year and they want me to come to nationals with them. Gotta be the guinea pig!

I wonder if the A052 are on the exclusion list this year as they knew availability was going to limited in the CAM-S sizes for nationals? Will be interesting to see how many street class cars will be on them this year.

I think the 7/32 tread depth A052 released around April. The CAM supp was last updated in Jan i believe.

3 of the 4 STS Miata in my club going to nationals are gonna be running A052’s. I think the 4th car has brand new set of rivals 1.5 so I dont think he was gonna order a set.

Tire Rack shows them as 6/32 !!
This tire is asymmetrical so can't flip them like the RE71 so may may not get as much life out of them ????

:cheers:
DH

The original A052 are 6/32. The revised ones are 7/32
https://www.tirerack.com/tires/tires...XLV2&tab=Sizes

I dont think i’d need to flip them. My Rivals wore pretty darn evenly
Attachment 48346800

I likely don't run as much camber as you. And I needed to flip my front RE71 after 5 days. So I'm just saying the RE71 can be flipped but not the A052. I will definitely be considering these when my RE71 need replacement as the 295 is .4 inch wider that the 285 and it is in the 10-11 inch recommended wheel size. (my fronts are 10 inch)

:cheers:
DH

Any chance the A052 will be out soon in a 335/18 ?

https://cimg4.ibsrv.net/gimg/www.cor...2e76e1a61c.png
https://cimg5.ibsrv.net/gimg/www.cor...4100a8babd.png
I’ve run Rivals flipped fwiw

Yokos run fat...I’ve seen a 315/30r18 squeezed onto a 10” rim though it wasn’t pretty