matt33

It seems most ppl go with 9x18 and 12x18 wheels for track use.

18" for more tire options and a little cheaper I understand.

Why though do ppl not opt for 9.5" fronts to have more tire width options? (especially considering most 245's can still be fitted to a 9.5" rim)

adi_d

Matty you are going down a dangerous path man!

I have 10 inch wide 18 wheels that accommodate 265/275/285 tires, and a 9.5 inch wide 19 wheels that can also accommodate 265/275 while also allowing 245/255 to be used. I would say that 9.5 is an ideal upgrade as it fits normal street tire sizing or track tires that you would want to be wider. Only issue I can think of is the fitment under stock fenders. I have the cup fenders and flares so it is not an issue, but I am sure stock fenders can accommodate the size with the right wheel offsets and/or fender modification.

Also, as a side note, the only 18 inch tire worth considering these days is NT01 for R-comp and BFG R1S for semi-slicks (best price/performance by far, but not streetable). In 19 sizing you have NT01 (stock size so meh), Cup2, RE71R (stock size) and Trofeo R. Hoosiers are available in all sizes

-Adi

bmwtye

9.5 fronts with 265s don't fit without modifications (ride height, alignment and having a lot of adjustability) and correct offsets. you will most likely need to roll Stock fenders as well. I also run cup flares with 9.5 and 265s. If you don't have things dialed in correctly even 265 will rub the fender liner with cup flares. 275 u need to move radiator mounting bracket forward a little.