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Speedometer Gear Calculator

Changing tires to a new size or changing rear-end gears can have an impact on speedometer accuracy. This is because your speedometer is controlled by two small gears that are optimized for a particular combination of tire size, rear-end gear ratio, and transmission type. The drive gear is attached to the transmission output shaft inside the tail shaft. The driven gear is attached to the end of the speedometer cable that is inserted into the side of your transmission.

wf      
mm
In mm, example: 225
wf      
percent
Also known as "profile", example: 70
wf      
inches
In inches, example: 14
wf      
:1
Example: 3.50:1
wf      
wf      
This should only be marked "Yes" with 3.91 or 4.30 rear end ratios.
     
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