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ran these in a race today. not on my vette. size 234x18. These tires do heat up quick. first outing started with 35 cold and end 47 hot. lowered to 32 and ended at 42 hot
Ordered a set today for my C7Z. I'm running 19x10, 19x12. I went with 295/30/19,345/30/19. I was wondering if I should have went with the 305's in the front. I ordered from Phils. How fast does he ship? Thanks
Fair enough. I have also seen them in the past at lower prices from overseas, but they go very quickly which is probably what happened.
What is your home track? Mine is Watkins Glen. I'll be back there again in a few weeks for 6 days and expect my NT01s to be done somewhere in the middle. I think I will take your advice and grab another set of NT01, but I am very much interested in your feedback on the R888R. Are both your Z06s C6s?
Unfortunately, I'm kind of stuck driving a fair distance in about a 3-5hr radius to get to any track. Options are Road America, Autobahn, Blackhawk Farms, and Raceway Park of the Midlands. I visit each of them at least once a year, among some others...so kind of bounce around a bit. Both of the ZO6's I have are C5's. I use one for straight line stuff like 1/2 mile events, and the other for track duty. We are hoping to hit the track in a little over a month. Looking forward to seeing how the R888R's do, as well as the new brakes!
Last edited by Quickshift_C5; 05-08-2017 at 04:18 PM.
Ordered a set today for my C7Z. I'm running 19x10, 19x12. I went with 295/30/19,345/30/19. I was wondering if I should have went with the 305's in the front. I ordered from Phils. How fast does he ship? Thanks
I'm curious how that front tire works out for you on a 10" wide wheels (same width fronts I have). Maybe I'm wrong but I feel like if the front tires are bulging a lot you don't get as crisp of a turn in. It's also not a linear relationship between width and traction. What I mean is that a 10% wider tire isn't going to result in 10% more mechanical grip since the amount of downward force from the weight of the car is the same just more spread out.
In my case 275s just look better and clear everything so that's what I run up front with the 345s in the rear.
Phil's tire service is SLOWWWWW. Good folks that are a great option when you are not in a hurry to get your tires. About 3 weeks ime.
I'm curious how that front tire works out for you on a 10" wide wheels (same width fronts I have). Maybe I'm wrong but I feel like if the front tires are bulging a lot you don't get as crisp of a turn in. It's also not a linear relationship between width and traction. What I mean is that a 10% wider tire isn't going to result in 10% more mechanical grip since the amount of downward force from the weight of the car is the same just more spread out.
In my case 275s just look better and clear everything so that's what I run up front with the 345s in the rear.
Phil's tire service is SLOWWWWW. Good folks that are a great option when you are not in a hurry to get your tires. About 3 weeks ime.
My wheels are 18x10.5 front, 19x11.5 rear. I first tried NT01s at 275/35/18 front, 305/30/19 rear. I thought I could use more traction, and later switched to same brand tire (NT01) at 315/30/18 front and 325/30/19 rear.
Bear in mind, 315s are on relatively small 10.5" wheels. The increase in traction was so immense, that my stock springs couldn't stop my car from leaning too much in corners, despite having GM's C7 T1 sways/shocks. I switched to coilovers, and the combination saved me 4-5 seconds in a 2 minute course.
I did research on the benefit of putting much wider tires without increasing wheel width before I did the switch. A vendor in CA tried this with their Honda and Miata cars. Their verdict was that when they increased tire width within the recommended range, their times dropped similarly, with or without wider wheels, but wider wheels provided better feedback. Sure, feedback is important, but it is OK to compromise when there's just not enough space for a wider wheel without running into excessive rubbing issues.
I'm curious how that front tire works out for you on a 10" wide wheels (same width fronts I have). Maybe I'm wrong but I feel like if the front tires are bulging a lot you don't get as crisp of a turn in. It's also not a linear relationship between width and traction. What I mean is that a 10% wider tire isn't going to result in 10% more mechanical grip since the amount of downward force from the weight of the car is the same just more spread out.
In my case 275s just look better and clear everything so that's what I run up front with the 345s in the rear.
Phil's tire service is SLOWWWWW. Good folks that are a great option when you are not in a hurry to get your tires. About 3 weeks ime.
My friend's '01 Z06 runs 325's square on 18x10.5 quite sucessfully.
Wow, that's the first time I've heard of anyone using 325's on front. Would love more info on this. Running them on the OEM 10.5 wheels sounds a bit absurd, there is already stretch with the 315's.
Moving to a lightweight aftermarket 10x11 wheel with 325's all around would be fantastic...
My wheels are 18x10.5 front, 19x11.5 rear. I first tried NT01s at 275/35/18 front, 305/30/19 rear. I thought I could use more traction, and later switched to same brand tire (NT01) at 315/30/18 front and 325/30/19 rear.
Bear in mind, 315s are on relatively small 10.5" wheels. The increase in traction was so immense, that my stock springs couldn't stop my car from leaning too much in corners, despite having GM's C7 T1 sways/shocks. I switched to coilovers, and the combination saved me 4-5 seconds in a 2 minute course.
I did research on the benefit of putting much wider tires without increasing wheel width before I did the switch. A vendor in CA tried this with their Honda and Miata cars. Their verdict was that when they increased tire width within the recommended range, their times dropped similarly, with or without wider wheels, but wider wheels provided better feedback. Sure, feedback is important, but it is OK to compromise when there's just not enough space for a wider wheel without running into excessive rubbing issues.
Good info. Looks like I have something new to try in the future. Thanks
I did look at those photos. His car looks pretty nice with those 295s on 10" wide front wheels. But I can't pull that off. My 275s already rub my brake cooling ducts. Also my car is still a street car and the tires would be hanging out past the fenders if I ran 295s.
As far as performance goes, I don't know if there are any gains here or not when utilizing a wheel that is a it narrow for the 295 tires. I will probably never know!
I'm sure eventually the R888R will be released in a 285/30x18 which would be a good fit on my car. But with the lower height would I really be gaining any actual additional contact patch? I dunno.
Also wider tires up front sort of suck when it starts to rain if you care about that sort of thing.
Wow, that's the first time I've heard of anyone using 325's on front. Would love more info on this. Running them on the OEM 10.5 wheels sounds a bit absurd, there is already stretch with the 315's.
Moving to a lightweight aftermarket 10x11 wheel with 325's all around would be fantastic...
The member's name is "Last C5" that runs those sizes. I'm sure he's posted about them.
Both are 345/30x19s and are lying on a flat surface. That's the old R888 on the left and the new R888R on the right that is 3/8" wider overall.
You need to mount them on the same wheels to get an accurate measurement. Keep in mind, all manufacturer measurements always come off of a tire mounted on a wheel, usually in the middle ballpark of the recommended wheel width range.
My opinion is that if you are measuring the tread as I did, and the rim is approximately the correct size for the tires being discussed, it doesn't make a hill of beans difference whether it's mounted or not.
In this case, when mounted on the same rim, the R888R turned out to be 5/8" wider when mounted on the rim than the previous R888.
My opinion is that if you are measuring the tread as I did, and the rim is approximately the correct size for the tires being discussed, it doesn't make a hill of beans difference whether it's mounted or not.
In this case, when mounted on the same rim, the R888R turned out to be 5/8" wider when mounted on the rim than the previous R888.
That doesn't make sense to me at all, but you're entitled to your opinion : ) There is no tire spec that is measured on an unmounted tire.
Both are 345/30x19s and are lying on a flat surface. That's the old R888 on the left and the new R888R on the right that is 5/8" wider overall.
That 5/8" difference is measured at the widest part of the tire. It doesn't matter what wheel width you mount it to, it's not going to change that delta. I have measured it myself on my 295x30x18's.
So I drove with a full set of R888Rs with the top off yesterday up to 80 mph. I would say the road noise is average to below average. Certainly quieter that the high efficiency tires that many cars run.
The pavement your on certainly makes a difference. I hit a bridge with grooves on it and the noise level jumped up notably.
My car on E85 has somewhere in the 510rwhp range but also has 4.10s.
They certainly hook up much better than my very worn old R888s but I still killed them off completely during a 25-60 mph roll yesterday. Lots of factors in that. Heat in the road, asphalt or concrete, etc.
On my old tires my car was pretty much on ice up to about 50 miles per hour in any gear. I swear I don't know how these Z06 guys drive around with 650 rear wheel horsepower on pilot sports.
05-07-2017, 07:47 PM
That 5/8" difference is measured at the widest part of the tire. It doesn't matter what wheel width you mount it to, it's not going to change that delta. I have measured it myself on my 295x30x18's. 
