Collinster742002
Collinster742002

Gear Ratio RPM Speed Guide

Using this Google spreadsheet developed by Grice Mulligan, AKA williamggruff, users and abusers alike can investigate the outcomes of matching various BMW  transmissions and differentials, and calculate a variety of RPM and speed values that result.

 

Inputs are simple:  Tire circumference and Redline RPM.  Tire circumference can be estimated using the link provided. Redline RPM can be a target RPM, such as a preferred RPM at a cruising speed.  

 

 

BMW transmission gear ratios and differential final gear ratios.xls


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