View Single Post
      02-09-2009, 09:57 AM   #15
GregW / Oregon
Commander-In-Chief
2122
Rep
8,924
Posts

Drives: 2023 M2 Coupe, 2020 GLE 450
Join Date: Nov 2005
Location: Lake Oswego, OR

iTrader: (3)

Garage List
Quote:
Originally Posted by Radiation Joe View Post
I think the speedo reads somewhere between 3 and 5 percent high. If the new tire is less than 3 percent larger in diameter than stock, your speedo accuracy will actually improve.
Well, almost--it's circumference you need to compare, not diameter. A 35 larger diameter will give you a 9+% larger circumference, which translates to 9% fewer revs/mile.
__________________

Greg Lake Oswego, Oregon, USA
2023 M2 Coupe - Brooklyn Grey/Cognac/CF, 6MT; 2020 MB GLE 450
Appreciate 0