A 17x9 is absolutely adequate for a 255 "for track use".

 

I currently have TSW Nurburgring 17x9 +63 for track wheels. BTW, 255 fit perfect on it!

I would love to know if Advan Racing RG-D 17x8.5 +51 offset would fit.....anyone know?

 

Will need a tiny roll unless you're running a lot of camber.

 

Many of us know that a 255 on a 17x9 its tried and true, I think what he meant was that a 17x10 will be better for track use than a 17x9. As in faster and better feel.

 

A 17x9 is adequate but it is far from optimal for a 255.

If you are going to spend the money to go to the track 17x10 is best:

* It is a proven fact that 17x10's will turn significantly faster lap times. This has been verified through datalogging by a number of consistently fast drivers on this forum and elsewhere.

* If you are buying new wheels save time and money and get the best size and brand from the beginning.

* You can by the 17x9 RPF1's then after a few weeks or months of tracking when they break and/or bend, you can buy the the the wheels you should have bought at first.

Ask the guys that track and have already gone through the 17x9 wheels and the weak wheels.

 

I have 17X9 +54 PF01 and the StopTech BBK does not fit. I would have needed like a 30mm spacer. I actually bought the kit and had to send it back and got hit up for like a 300 restocking charge, not a happy camper. PF01 are strong and are great for autocross, everyone in STR class runs 17X9 with 255. Cannot speak to tracking.

 

I meant to say if they will fit under Stoptech BBK?

 

A 17x9 is adequate but it is far from optimal for a 255.

If you are going to spend the money to go to the track 17x10 is best:

* It is a proven fact that 17x10's will turn significantly faster lap times. This has been verified through datalogging by a number of consistently fast drivers on this forum and elsewhere.

* If you are buying new wheels save time and money and get the best size and brand from the beginning.

* You can by the 17x9 RPF1's then after a few weeks or months of tracking when they break and/or bend, you can buy the the the wheels you should have bought at first.

Ask the guys that track and have already gone through the 17x9 wheels and the weak wheels.
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doesn't make sense intuitively that a 255 is faster on a 10" wheel than a 9" wheel. all things being equal a 10" wheel is going to be heavier and have worse steering response. would love to see the data on that if you have it. was the change in wheel width the only variable in the comparison? no other changes to the car, tires, or conditions?

i've also never seen/heard of an RPF1 breaking. are you saying that RPF1s are weak or 17x9 are weak? what do you suggest for a stronger wheel?

 

^^^ rpf1s are notoriously weak and bend and crack at the track quite often (bend more than crack). If you want to stick with a cheaper cast wheel, got for the NT03+M in 17x9.5 +44. They're a lot stronger and are sized better for 255s. Another stong cast wheel is the rp03.

As far as 17x10s being faster, a little bit of stretch is good. It stiffens up the side wall and improves both feel and response (due to less sidewall flex).

All the major race teams run stretched tires. Dtm, super gt, and lemans lmp1 cars are all moving to wider rims, but not necessarily tires.

A number of s2k challenge guys have done the comparisons. As far as everyone in STR running 17x9s, it's because it's the widest wheel that you're allowed to run and, no fender mods allowed. However, the next class up (bsp??) Are all running 17x10s to even be somewhat competitive at the national level.

 

The 17x9 +45 rpf1 will need closer to 20mm to clear the stoptech BBK.
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Ill be using the 8 inch front unfortunately . I want to use the tsw square but the rpf1 light weight i see as a greater benefit. I have to find a wheel that doesnt require my fenders flared to fit, has to be only a roll or i get a performance point in the time attack i enter next season.