Hehe, I got that name from back when arcade video games only gave you 3 letters for high score. I used PRF.FRUNKenstein wrote: ↑Tue Oct 13, 2020 4:48 pm Professor -
I didn't check the actual dimensions, but Porsche recommends either 265/35 or 275/35 for the rears to go along with 225/40, so I figured they will be fine. The 275 should be closer to the OE circumference (295) than the 265. But, I will double check anyway as I don't want to thrash the viscous coupling.
My owner's guide (I have a 2003 TT) shows 225/40-18 fronts and 265/35-18 rears for winter tires, 225/40-18 and 295/30-18 for summer tires, and I have used 245/40-18 fronts and 315/30-18 rears (GT2 sizes) for track tires.
Track tires are Nitto NT01's:
245/40-18 is 789 revs/mile
315/30-18 is 796 revs/mile
so the fronts are turning slower. Incidentally the digital speedo is exactly correct with these tires!
Summer tires are Sumi HTR3's:
225/40-18 is 823 revs/mile
295/30-18 is 837 revs/mile
so the fronts are turning slower here, too. Incidentally the speedo reads 4 mph slow at highway speeds. Indicated = 75, actual = 71.
Suggested winters, I looked up the Michelin Pilot Sport A/S on tire rack:
225/40-18 is 825 revs/mile
265/35-18 is 816 revs/mile
So now the fronts are turning faster. What's up with this, Porsche? I guess it's OK, as they recommend it. I've read many times of odd handling and performance issues with fronts turning faster though.
Incidentally these are in stock at Tire Rack for $679 with the "instant rebate".
Incidentally the 275/35-18 Michelin Pilot Sport A/S is also listed as 816 rev/mile, which can't be correct.