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Hi,

I could use some help on this.  I changed the gearing in the axle to 3.50 gears. It came with 3.0 gears. Do I need to change the speedo cable gear now? 

Thanks for helping 

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Yes you will . Depending on tyre size a 20 or 21 for auto , manual may be bit different 

Edited by Gregaust
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You can use the spreadsheet to get your approximate tire diameter

 

Edited by Don C
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“If you can't explain it simply, you don't understand it well enough.”

--Albert Einstein

 

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  • 2 weeks later...
On 9/14/2020 at 2:51 AM, machattack said:

Thanks for the response.

I left out some important info out, sorry. It is a fmx auto transmission. Rear tire size is 275/60/15

If a street type tread , likely a 20 will do .. I have found a 275/60 drag radial a little taller than a street tyre and is best with 21

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