BMW Gearing Calculator

This is a wee Javascript routine to help the really Sad and Nerdy amongst us who loose sleep worrying about gear and final drive ratios. Enjoy!

First you need to know your wheel diameter.


in mm
Profile Alloy diameter
in inches
Total diameter
in mm


Then we can worry about the gearing. Default values are my 635CSi euro.


1st gear 2nd gear 3rd gear 4th gear 5th gear 6th gear Reverse Final drive
:1 :1 :1 :1 :1 :1 :1 :1
Engine speed RPM  
Speed MPH mph  
Speed Km/h km/h  


BMW at Partsgeek