I want to put the most rubber I can get on a new Cayman GTS for autocross. Has anyone tried 315/30/18s in the rear or 285/30/18s in the front?
You should reread my post and note the "(OP)" reference, and not apply it to the post directly in front of mine. :hilarious:To answer the previous two posts. I couldn't find the specs for that tire on Tire Rack, however, I have run Hooiser A6s and ZIIs in 285/30/18 on the rears (not 19s) on both my 987 and the new 981 GTS on 10" wide rims with no problems. I agree with Amdeutch using the 285 and 245 F could set up an electronics problem so when I have and do run the 285/30/18 rears I use a 255/35/18 front on an 8.5 in wide rim with no electronics problem as both sizes are approximately the same diameter and the balance of the car is near perfect. My original post here was to explore wider sizes and find out if anyone had used 285 fronts and 315 rears.
I want to put the most rubber I can get on a new Cayman GTS for autocross. Has anyone tried 315/30/18s in the rear or 285/35/18s in the front?
315/30 = 94.5 sidewall and 285/35 = 99.75 sidewall; for the same wheel diameterAmdeutch. I read that and the front diameter of 24.9 and rear diameter of 25.6 would not present a problem with everything I have read and tried over the years in fairly extensive testing. Everything I have read says that the rear diameter has to be equal or greater than the fronts.
Not 285 on the rear, we run 275/35R-19 and 245/40R-19 as our competition tires. I'm pretty sure there's 5mm spare in there, I need to check sometime. The wheels have about 5mm more offset than standard.Has anyone tried 245 front and 285 rear on 8.5 and 10 inch rims.