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Gearbox & Speedo Ratio Calculator

 
 
   Select Details   
Tyre Size 
Drop Gear Ratio 
Gearbox type 
Final Drive Ratio 
TPM of Speedo 
Worm & Pinion ratio 


 
 
   Calculated Speed by RPM in each Gear   
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   Actual Speed vs (Speedo Reading)   
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   Guessworks Feature Product - Speedo Worm Drive - 6 Tooth   
When changing wheel sizes, final drive ratios or Speedo clusters it is essential to make sure the speedo cable worm and pinion drives are correct for the car. There are many combinations available, some work better than others, but one which is suitable for the application can usually be found.

This is for a single 6 Tooth worm drive, 2A3720, compatible with the following pinions

Part number reference
16 Tooth DAM2905
17 Tooth22A1881 superseded by DAM2904
18 Tooth22G2024 superseded by DAM6365

To calculate the required drive please use my ratio calculator page http://www.guess-works.com/Tech/ratio.htm.

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£ 12.50 + VAT
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