D Stock Are my tires too wide for my wheels?
#1
Are my tires too wide for my wheels?
I'm running 225/50-16 Bridgestone Potenza RE-01 tires on Rota Slipstream 16x6.5 wheels on my 2007 MCS. The tires have a noticable bulge from being on such narrow wheels.
The reason I'm using street tires is that I'm running in a G-Stock Street tire class here in Southern California. I use my car as a daily driver in addition to autocross. FWIW the 225/50-16 is cheaper than other sizes, and my thoughts were along the lines of more rubber for less $$$ is better. Now I'm wondering if more rubber might be less utilized (due to a curved profile on the tread), and heavier than a smaller tire would be and slowing down my autocross times.
I went with 16 inch wheels because the widest rubber I could get on 17's is 225, and that would be no wider than what will fit on 16's.
I would appreciate any input from the wizen fellow AutoX's here.
The reason I'm using street tires is that I'm running in a G-Stock Street tire class here in Southern California. I use my car as a daily driver in addition to autocross. FWIW the 225/50-16 is cheaper than other sizes, and my thoughts were along the lines of more rubber for less $$$ is better. Now I'm wondering if more rubber might be less utilized (due to a curved profile on the tread), and heavier than a smaller tire would be and slowing down my autocross times.
I went with 16 inch wheels because the widest rubber I could get on 17's is 225, and that would be no wider than what will fit on 16's.
I would appreciate any input from the wizen fellow AutoX's here.
#2
225 is safe. I was running 225/50/15 victoracers on 15x6.5 Konig's last season (we're pretty lenient on some rules for stock classes). I've read somewhere that someone was running 235's on stock rims. If you're worried about rubbing, or if you're getting a little bit, you can easily fix it with a 5mm spacer; that's the maximum allowed.
Last edited by L8Apex; 12-24-2007 at 12:34 AM. Reason: typos...
#3
#4
In the OP case he is running Rota's with a 45mm offset, so he could legally add a 3.35 mm spacer in Stock class. If you found some 72mm offset wheels, you could legally run a 30mm spacer... Not that you would really want to do that.
#5
Back on topic. In stock class you can run any size tire you can squeeze onto a stock size wheel. Since you are limited in wheel width it makes sense to try to add more grip by using wider tires. the tradeoff is slightly less crisp response
I will be running my car in our stock street tire class this year, and will most likely be running the 235/40/17 RE-01R on 17x7s. Nice and wide, but with stock height.
I will be running my car in our stock street tire class this year, and will most likely be running the 235/40/17 RE-01R on 17x7s. Nice and wide, but with stock height.
#6
I'm running 225/50-16 Bridgestone Potenza RE-01 tires on Rota Slipstream 16x6.5 wheels on my 2007 MCS. The tires have a noticable bulge from being on such narrow wheels.
The reason I'm using street tires is that I'm running in a G-Stock Street tire class here in Southern California. I use my car as a daily driver in addition to autocross. FWIW the 225/50-16 is cheaper than other sizes, and my thoughts were along the lines of more rubber for less $$$ is better. Now I'm wondering if more rubber might be less utilized (due to a curved profile on the tread), and heavier than a smaller tire would be and slowing down my autocross times.
I went with 16 inch wheels because the widest rubber I could get on 17's is 225, and that would be no wider than what will fit on 16's.
I would appreciate any input from the wizen fellow AutoX's here.
The reason I'm using street tires is that I'm running in a G-Stock Street tire class here in Southern California. I use my car as a daily driver in addition to autocross. FWIW the 225/50-16 is cheaper than other sizes, and my thoughts were along the lines of more rubber for less $$$ is better. Now I'm wondering if more rubber might be less utilized (due to a curved profile on the tread), and heavier than a smaller tire would be and slowing down my autocross times.
I went with 16 inch wheels because the widest rubber I could get on 17's is 225, and that would be no wider than what will fit on 16's.
I would appreciate any input from the wizen fellow AutoX's here.
Last edited by OasisT; 12-24-2007 at 12:53 PM.
#7
Thanks for the responses Guys,
Oasis T: Is there any reason besides being too tall that makes you say these tires are not optimal? I have noticed a definite decrease in feedback when compared to my 40 series OEM run flats, but also a huge increase in traction. Does lack of feedback make the car slower, or just feel slower? I think it does hurt me in the slaloms when I really cant tell what the tires are doing.
For reference I've had these tires for 30 Autocrosses runs and 2K miles of street driving with No rubbing, and this is a G Stock legal tire and wheel.
Oasis T: Is there any reason besides being too tall that makes you say these tires are not optimal? I have noticed a definite decrease in feedback when compared to my 40 series OEM run flats, but also a huge increase in traction. Does lack of feedback make the car slower, or just feel slower? I think it does hurt me in the slaloms when I really cant tell what the tires are doing.
For reference I've had these tires for 30 Autocrosses runs and 2K miles of street driving with No rubbing, and this is a G Stock legal tire and wheel.
Last edited by acender; 12-26-2007 at 03:14 AM. Reason: added detail
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#8
Thanks for the responses Guys,
Oasis T: Is there any reason besides being too tall that makes you say these tires are not optimal? I have noticed a definite decrease in feedback when compared to my 40 series OEM run flats, but also a huge increase in traction. Does lack of feedback make the car slower, or just feel slower? I think it does hurt me in the slaloms when I really cant tell what the tires are doing.
For reference I've had these tires for 30 Autocrosses runs and 2K miles of street driving with No rubbing, and this is a G Stock legal tire and wheel.
Oasis T: Is there any reason besides being too tall that makes you say these tires are not optimal? I have noticed a definite decrease in feedback when compared to my 40 series OEM run flats, but also a huge increase in traction. Does lack of feedback make the car slower, or just feel slower? I think it does hurt me in the slaloms when I really cant tell what the tires are doing.
For reference I've had these tires for 30 Autocrosses runs and 2K miles of street driving with No rubbing, and this is a G Stock legal tire and wheel.
I run in Canada, and our courses are apparently much tighter than the average National course. As such, I do not know of a great 16" tire combination, as the 215 and 205 section width tires are probably not enough, but the 225/50s are just too tall. I think that the 225/40R17 is proabably a better GS choice.
When it coems to response times, you just need to anticipate what the tire or car is going to do.
#9
#10
I have the tires mounted and on the car now! They look GREAT. The 225/45r16 has to be the widest tire you can fit on the rim that is still a hair shorter than the stock one. They hang off the sides a bit, but it is actually less than I expected. I can't believe that others have not tried these tires yet. I know they are expensive, but from my research I believe that they will be very competitive. Plus, if you want, you can put your wheels on at home then drive to the track. If you had Kuhmo's or Hoosiers you could not do this.
#13
a 225 RE01R is sized like a 235. I'm concerned about running them in 215 on a 7", so I wouldn't recommend a 225 on a 6.5". Look at the manufacturer's site (or tirerack.com) for specs on your size - I doubt it's recommended to go below 7". Can you do it? yes, but it's not ideal
http://www.tirerack.com/tires/Spec.j...m%3D25VR6RE01R
#14
tire sizes
Not to complicate things, but the question of what size tire is the largest you can get on a rim width will vary with the tire.
Hoosiers have always worked well stuffed on a narrow rim (the CRX guys were running 225s on 5 inch rims), but Kumhos generally hate to be stretched.
Based on the way my RE01Rs are wearing, I think 225 would work on a 6.5'rim.
Hoosiers have always worked well stuffed on a narrow rim (the CRX guys were running 225s on 5 inch rims), but Kumhos generally hate to be stretched.
Based on the way my RE01Rs are wearing, I think 225 would work on a 6.5'rim.
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