18'' wheels for C6
Drifting
Joined: Nov 2004
Posts: 1,753
Likes: 2
From: Fresno CA
Again just my .02 stay away from aftermarket C5 ZO6 replica wheels or thin spoke replica wheels, they break with track use. You can get 97-98 C5 wheels in 17 and 18 real cheap and better quality than inexpensive aftermarket wheels but there not very light! You can even pick up the Magnesium wheels, special option on C5's, pretty cheap sometimes.Takeoff GM thin spokes or takeoff GM ZO6 wheels are not too bad either price wise.
Originally Posted by LeeWB3
Tried this in the autocross section with no response, so I'll try here as well...
I'm looking into changing out tires for autocross. Already have headers and air box so I'm into group II (NCCC) and definately need tires to be competitive. Since in group II anyway doesn't matter if I switch wheel size....
Everyone around here is running Kumho's, so it looks to me like my best bet is 275/40-17 front and 315/35-18 rear. From Cucchiara's post I'm more or less getting that this will fit with some offset or another. Note that I've lowered the rear as far as the stock bolts allow and then dropped the front just a bit to look "right".
Any suggestions for cheap, track-only wheels? Don't care in the least if they stick out some, etc. - just so that they're wide enough (9.0-11.0 front and 10.5-12.5 rear), have offsets that keep everything from rubbing with the tires listed above and don't weigh too much. I'd guess wider is better as long as they don't rub in order to minimize sidewall flex.
Thanks for any advice.
I'm looking into changing out tires for autocross. Already have headers and air box so I'm into group II (NCCC) and definately need tires to be competitive. Since in group II anyway doesn't matter if I switch wheel size....
Everyone around here is running Kumho's, so it looks to me like my best bet is 275/40-17 front and 315/35-18 rear. From Cucchiara's post I'm more or less getting that this will fit with some offset or another. Note that I've lowered the rear as far as the stock bolts allow and then dropped the front just a bit to look "right".
Any suggestions for cheap, track-only wheels? Don't care in the least if they stick out some, etc. - just so that they're wide enough (9.0-11.0 front and 10.5-12.5 rear), have offsets that keep everything from rubbing with the tires listed above and don't weigh too much. I'd guess wider is better as long as they don't rub in order to minimize sidewall flex.
Thanks for any advice.
Drifting
Joined: Nov 2004
Posts: 1,753
Likes: 2
From: Fresno CA
Originally Posted by mlongo99
I'm guessing you have the Z51 brakes then. If you use the smaller rotors from the base/F55 packages then a 17'' will fit. That is the same rotor and caliper as the C5 Z06 and it has 17'' wheels in front.
Le Mans Master
Joined: Sep 2004
Posts: 7,027
Likes: 6
From: Shiloh Ohio
Actually they make spacers specifically for race applications. Some spacers are the same strength as no spacer at all. I would not do it if it was dangerous.
I am not talking about just a cosmetic type spacer. I am talking a full race type spacer used to increase the rear footprint.
The front OEM offset moves the tires to far in when used on the rear. You would not have to use a spacer but your rear tire will be about 1/2 to in inch further in than the front.
I am not talking about just a cosmetic type spacer. I am talking a full race type spacer used to increase the rear footprint.
The front OEM offset moves the tires to far in when used on the rear. You would not have to use a spacer but your rear tire will be about 1/2 to in inch further in than the front.
Drifting
Joined: Nov 2004
Posts: 1,753
Likes: 2
From: Fresno CA
I wish I had some pics of those I have taken off cars broken. They crack right through a lug hole, when one hole cracks they start to wobble on the car, this usually brings the car into the shop.Its your Vette.
Burning Brakes
Joined: Aug 2005
Posts: 767
Likes: 6
From: near Spokane WA
Originally Posted by mlongo99
I'm guessing you have the Z51 brakes then. If you use the smaller rotors from the base/F55 packages then a 17'' will fit. That is the same rotor and caliper as the C5 Z06 and it has 17'' wheels in front.
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Instructor
Joined: May 2005
Posts: 105
Likes: 1
From: Atlanta GA
OK, then. I guess 17s arn't an option for me.
If so, then I guess 18s all around. I suppose I'd have to go to a 285/30-18 which is quite a bit smaller (60mph goes to 57.7mph). But it should work without TC/AH messing up the car somehow, right?
The 285s require at least a 9.5" rim. So maybe the following sizes:
285/30-18 on 9.5" rim
315/35-18 on 10.5" rim
with normal C5Z06 offsets? Again, I don't care if they stick out, it's for track use. I'd be better off with wider wheels (tire flex), but the ones above appear to be much more commonly available and therefore much cheaper. Does this all sound like it'll work?
If so, then I guess 18s all around. I suppose I'd have to go to a 285/30-18 which is quite a bit smaller (60mph goes to 57.7mph). But it should work without TC/AH messing up the car somehow, right?
The 285s require at least a 9.5" rim. So maybe the following sizes:
285/30-18 on 9.5" rim
315/35-18 on 10.5" rim
with normal C5Z06 offsets? Again, I don't care if they stick out, it's for track use. I'd be better off with wider wheels (tire flex), but the ones above appear to be much more commonly available and therefore much cheaper. Does this all sound like it'll work?
Last edited by LeeWB3; Apr 11, 2006 at 08:29 AM.
Burning Brakes
Joined: Aug 2005
Posts: 767
Likes: 6
From: near Spokane WA
Originally Posted by LeeWB3
The 285s require at least a 9.5" rim. So maybe the following sizes:
285/30-18 on 9.5" rim
315/35-18 on 10.5" rim
Does this all sound like it'll work?
285/30-18 on 9.5" rim
315/35-18 on 10.5" rim
Does this all sound like it'll work?
2. The rear of the C6 will take 11" width with no problem. I'd go with 11" width if you are considering 315s. And I'd go with 18s with 10" width on the front. Those are common sizes that CCW is sending out all over the country.
3. The issue of AH/TC still isn't clear to me but it seems that most of the guys are saying that if you shut the whole system OFF that some disparity from stock in front to rear diameters is not a problem. The C6 is so new and so few guys reporting that the jury may still be out on this one. But with a 285x30x18 on the front and 315x30x18 on the rear (Hoosier R6 sizes) then you'd have a 1" larger diameter in the rear and I don't think a nervous computer would react to that -- especially if you shut the AH/TC OFF.
Norm
Last edited by Norm_427; Apr 11, 2006 at 09:34 AM.
Instructor
Joined: May 2005
Posts: 105
Likes: 1
From: Atlanta GA
This is strictly as second set of wheels/tires for autocross.
I wasn't looking at Hoosiers. Around here the preferred tires are Kumho 710s. I'm told that while the hoosiers may be somewhat better they wear out very fast and that the Kumhos will last about a full season. That's why I was spec'ing the sizes I gave.
I'll look into the larger wheel sizes, would prefer that anyway. However, cost is a very big deal and was looking for cheap, track-only wheels rather than the gorgous stuff CCW sells.
As to AH/TC, I'm very new at this so I was running in comp mode on the stock tires as a little bit of insurance that I don't completely spin. Tried it a couple of times without and did fine but wasn't able to mentally be quite as aggressive. I'm sure I'll get over that soon.
Just doesn't appear to be all that many good choices yet!
I wasn't looking at Hoosiers. Around here the preferred tires are Kumho 710s. I'm told that while the hoosiers may be somewhat better they wear out very fast and that the Kumhos will last about a full season. That's why I was spec'ing the sizes I gave.
I'll look into the larger wheel sizes, would prefer that anyway. However, cost is a very big deal and was looking for cheap, track-only wheels rather than the gorgous stuff CCW sells.
As to AH/TC, I'm very new at this so I was running in comp mode on the stock tires as a little bit of insurance that I don't completely spin. Tried it a couple of times without and did fine but wasn't able to mentally be quite as aggressive. I'm sure I'll get over that soon.
Just doesn't appear to be all that many good choices yet!
Le Mans Master
Joined: Dec 2004
Posts: 5,759
Likes: 539
From: AZ
St. Jude Donor '06-'08-'10-'11-'12-'13 '14-'15-'16-'17-'18-'19
Originally Posted by LeeWB3
This is strictly as second set of wheels/tires for autocross.
I wasn't looking at Hoosiers. Around here the preferred tires are Kumho 710s. I'm told that while the hoosiers may be somewhat better they wear out very fast and that the Kumhos will last about a full season. That's why I was spec'ing the sizes I gave.
I'll look into the larger wheel sizes, would prefer that anyway. However, cost is a very big deal and was looking for cheap, track-only wheels rather than the gorgous stuff CCW sells.
As to AH/TC, I'm very new at this so I was running in comp mode on the stock tires as a little bit of insurance that I don't completely spin. Tried it a couple of times without and did fine but wasn't able to mentally be quite as aggressive. I'm sure I'll get over that soon.
Just doesn't appear to be all that many good choices yet!
I wasn't looking at Hoosiers. Around here the preferred tires are Kumho 710s. I'm told that while the hoosiers may be somewhat better they wear out very fast and that the Kumhos will last about a full season. That's why I was spec'ing the sizes I gave.
I'll look into the larger wheel sizes, would prefer that anyway. However, cost is a very big deal and was looking for cheap, track-only wheels rather than the gorgous stuff CCW sells.
As to AH/TC, I'm very new at this so I was running in comp mode on the stock tires as a little bit of insurance that I don't completely spin. Tried it a couple of times without and did fine but wasn't able to mentally be quite as aggressive. I'm sure I'll get over that soon.
Just doesn't appear to be all that many good choices yet!
I have a set of 18" Champions for sale in pretty much the size you want, if I remember correctly. Here is the link to the posting in the parts section. Let me know if this might work for you.
http://forums.corvetteforum.com/show....php?t=1347133
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Burning Brakes
Joined: Aug 2005
Posts: 767
Likes: 6
From: near Spokane WA
I understand the Kumho vs Hoosier issue -- however, Hoosier has just come out with a new line of tires the A6 for autocross and R6 for terrorizing the track. I think the difference between the 2 brands will be much less with these new tires.
I too am trying to get the best autox setup and the Kumhos 285x30x18 and 315x35x18 just give too much rake for my comfort level -- 2" rake is a bit too much. That's why I am going with the new A6 Hoosiers 285x30x18 and 315x30x18 with 1" rake.
I've run 2 or 3 autcrosses on the stock tires and I must say that those tires stick better than I thought they would. The advance in high performace street tires is simply amazing. They probably stick as well as my autocross tires I used 10 years ago which were Yokohama 008s. Street tire classes are poping up around the country.
As for cost, you might even consider some steel wheels. ? If you do go with the better custom wheels you can run them a few seasons and sell them and recover much of your original investment. Racing is expensive -- even autox.
I too am trying to get the best autox setup and the Kumhos 285x30x18 and 315x35x18 just give too much rake for my comfort level -- 2" rake is a bit too much. That's why I am going with the new A6 Hoosiers 285x30x18 and 315x30x18 with 1" rake.
I've run 2 or 3 autcrosses on the stock tires and I must say that those tires stick better than I thought they would. The advance in high performace street tires is simply amazing. They probably stick as well as my autocross tires I used 10 years ago which were Yokohama 008s. Street tire classes are poping up around the country.
As for cost, you might even consider some steel wheels. ? If you do go with the better custom wheels you can run them a few seasons and sell them and recover much of your original investment. Racing is expensive -- even autox.
Race Director
Joined: Jan 2000
Posts: 12,375
Likes: 406
From: Florida
Originally Posted by Cucchiara
Your first paragraph is also crap, you want to see my C5 size C6 replica wheels in 18x10 on the back of my C6? They dont stick out at all.
Regarding 17 fronts, they won;t fit Z51 cars, but you just change caliper mounting bracket to the base car's and run a solid rotor. At least that rotor won't crack at the track.
8th Gear
Joined: Jan 2005
Posts: 8
Likes: 0
From: Delta Ohio
c5 wheels n a stock c6
Since this is a tire and rim discussion.
I would like to know if the c5 wheels (17 front & 18 rear) will fit my 2006 stock c6
Being a cheep a** and I am not going to put it on a track or hard driving
Will the above tires and rims fit so that I do not have to buy the pricey 19 on the back?
Also has anyone found out how to defeat the tire pressure monitors
If you go with out run flats
Not being a smart a** but if I go with regular tires. I can check the tire pressure like I do in any of my other cars and truck and believe me the tires on my 2500 heavy-duty have to be checked because you can not look and say if the pressure is ok like my suburban
Thanks for your input on this
John
I would like to know if the c5 wheels (17 front & 18 rear) will fit my 2006 stock c6
Being a cheep a** and I am not going to put it on a track or hard driving
Will the above tires and rims fit so that I do not have to buy the pricey 19 on the back?
Also has anyone found out how to defeat the tire pressure monitors
If you go with out run flats
Not being a smart a** but if I go with regular tires. I can check the tire pressure like I do in any of my other cars and truck and believe me the tires on my 2500 heavy-duty have to be checked because you can not look and say if the pressure is ok like my suburban
Thanks for your input on this
John
Racer
Joined: May 2004
Posts: 477
Likes: 0
From: South Park (Pittsburgh) PA
Originally Posted by jfs427
Since this is a tire and rim discussion.
I would like to know if the c5 wheels (17 front & 18 rear) will fit my 2006 stock c6
Being a cheep a** and I am not going to put it on a track or hard driving
Will the above tires and rims fit so that I do not have to buy the pricey 19 on the back?
Also has anyone found out how to defeat the tire pressure monitors
If you go with out run flats
Not being a smart a** but if I go with regular tires. I can check the tire pressure like I do in any of my other cars and truck and believe me the tires on my 2500 heavy-duty have to be checked because you can not look and say if the pressure is ok like my suburban
Thanks for your input on this
John
I would like to know if the c5 wheels (17 front & 18 rear) will fit my 2006 stock c6
Being a cheep a** and I am not going to put it on a track or hard driving
Will the above tires and rims fit so that I do not have to buy the pricey 19 on the back?
Also has anyone found out how to defeat the tire pressure monitors
If you go with out run flats
Not being a smart a** but if I go with regular tires. I can check the tire pressure like I do in any of my other cars and truck and believe me the tires on my 2500 heavy-duty have to be checked because you can not look and say if the pressure is ok like my suburban
Thanks for your input on this
John
Give me a call anytime on 724-882-5266. Leave a message if I miss the call and I will call you back.
Thanks,
Bob
Drifting
Joined: Nov 2004
Posts: 1,753
Likes: 2
From: Fresno CA
Originally Posted by TTRotary
No, you're full of crap. There is no such thing as 18x10 C5 wheels. There is 18x9.5, which fits, and there is 18x10.5, the Z06 wheel, which won't fit. I know they won't fit, because I have both cars and swapped.
Regarding 17 fronts, they won;t fit Z51 cars, but you just change caliper mounting bracket to the base car's and run a solid rotor. At least that rotor won't crack at the track.
Regarding 17 fronts, they won;t fit Z51 cars, but you just change caliper mounting bracket to the base car's and run a solid rotor. At least that rotor won't crack at the track.
Sorry I forgot the little .5 after the 10 in my post.The 10.5 inch wide wheels I put on my car fit and did not stick out of the wheel well.The 9.5 inch wide C5 wheels on the back are actually inside the wheel well lip not even with the lip.
The standard 17" and 18" C5 wheels also fit right on my C6 without any fitment issues.My C6 is not a Z51 car.
Race Director
Joined: Jan 2000
Posts: 12,375
Likes: 406
From: Florida
I cannot believe you put 18x10.5 C6 style wheels or any other C5 / C6 type wheel in that size on the back of your C6 and they did not stick out. Those wheels stuck out nearly 0.5 inches on one side and 0.25 on the other on my car, and the 4 vendors of these wheels I contacted concede that ALL 18x10.5 C5 / C6 wheels will stick out on the C6. That is because you are putting a .5 inch wider wheel with a 65mm offset in a fender designed for a 79mm offset, 10 in wheel. It's not even close.
I would really like to see a pic of this on your car.
I would really like to see a pic of this on your car.
Last edited by TTRotary; Apr 14, 2006 at 06:39 PM.
Burning Brakes
Joined: Aug 2005
Posts: 767
Likes: 6
From: near Spokane WA
http://www.ccwheel.com/misc/march22pics/c6's/2753518front3253019rear/
These are pix of CCW wheels on a C6 featuring 18x10 on the front and 19x11 rear with 275s and 325s. I think it is Pix # 9 that shows a good shot down the side of the car. John at Complete Custom Wheels says these tires tuck in on compression and clear the fenders. Check the pix and see what you think. You may have to copy and paste the site to get it to work.
I'm going to autocross my C6 Z51 some and I just ordered a set of 18x10s for the front and I'm putting 285 or 295 Hoosier A6s on them & a pair of 18x11s for the rear with 315s. John is taking the extra inch of the new rear wheel and putting 1/2" inside and the other 1/2" out ... and with the extra 1 1/2 " width of the front wheel he's tucking 1" inside and letting the other 1/2" hang outside. It should look just like the photos above with the exception of heigth with my rear being an 18.
"Sticking out" is a bit relative as the fenders curve some at the bottom and then the amount of negative camber also affects how much and just where a tire "sticks out".
These are pix of CCW wheels on a C6 featuring 18x10 on the front and 19x11 rear with 275s and 325s. I think it is Pix # 9 that shows a good shot down the side of the car. John at Complete Custom Wheels says these tires tuck in on compression and clear the fenders. Check the pix and see what you think. You may have to copy and paste the site to get it to work.
I'm going to autocross my C6 Z51 some and I just ordered a set of 18x10s for the front and I'm putting 285 or 295 Hoosier A6s on them & a pair of 18x11s for the rear with 315s. John is taking the extra inch of the new rear wheel and putting 1/2" inside and the other 1/2" out ... and with the extra 1 1/2 " width of the front wheel he's tucking 1" inside and letting the other 1/2" hang outside. It should look just like the photos above with the exception of heigth with my rear being an 18.
"Sticking out" is a bit relative as the fenders curve some at the bottom and then the amount of negative camber also affects how much and just where a tire "sticks out".
Last edited by Norm_427; Apr 14, 2006 at 07:43 PM.