The complete automotive resource for buyers, sellers, and owners like you.
Car, Truck and SUV Forums at Roadfly
+ Bentley Forums
+ BMW Forums
+ Cadillac Forums
+ Chevrolet Forums
+ Ferrari Forums
+ Jaguar Forums
+ Lamborghini Forums
+ Lotus Forums
+ Mercedes-Benz Forums
+ Maserati Forums
+ MINI Forums
+ Porsche Forums
+ General Discussion
+ Marketplace Forums
Speeds-in-gears w/2.82 vs 3.15 (archive)
[ Follow Ups ] [ 5-series (E39) Message Board ] [ Msg. Board FAQ ]
Posted by JEM on May 07, 2000 at 22:32:07:

Someone wanted this earlier, thought I'd better start a new thread on it:

The 235/45-17 and 255/40-17 are approximately equal in diameter (what matters is the loaded radius, and the 255/40-17 is about .10 inch shorter on both BFG and Dunlop spec sheets.)

Assuming 825 revs/mile (approx) it works out to:

tire revs/mile * top gear ratio * final drive ratio
= engine RPM @ 60mph

Or, for the automatic:
825 * .80 * 2.82 = 1860rpm @ 60mph, 2480rpm @ 80mph
825 * .80 * 3.15 = 2080rpm @ 60mph, 2775rpm @ 80mph



Follow Ups:


[ Follow Ups ] [ 5-series (E39) Message Board ] [ Msg. Board FAQ ]
Questions, comments, or problems, please visit the Roadfly help desk.
Roadfly.com Logo © 1997 - 2009 Jump Internet Inc. All rights reserved.