View Single Post
      04-04-2013, 06:54 AM   #32
Lieutenant General
CanAutM3's Avatar

Drives: 2015 M4 DCT
Join Date: Jan 2012
Location: Montreal

iTrader: (0)

Garage List
2018 Audi RS3  [0.00]
2015 BMW M4  [4.29]
Originally Posted by kotik View Post
Tire size is 285/30-19.

Hmm... maybe i had a bad calculator before.... My math is bad this morning... so what is the descrepancy % if shown speed is 337km/h?. About 7%?
With this tire size, theoretical max in 6th at 8400RPM is 309km/h. This means about a 9% error.

These are all approximations though. The actual tire diameter is not necessarily a direct correlation to the "quoted" size and aspect ratio. Further, especially at these high speeds, tire slip is not negligible which induces an even greater error. The easiest way to figure out the exact speed is with a GPS.

Last edited by CanAutM3; 04-04-2013 at 07:22 AM.