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.

 

Width 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

Gear	First Second Third Fourth Fifth Sixth Reverse
Engine speed	RPM
Speed MPH	mph
Speed Km/h	km/h