# What gear ratio do I have?

**URL:** <https://community.electricforum.com/t/what-gear-ratio-do-i-have/5696>\
**Category:** GEM Forum\
**Created:** [December 24, 2015, 7:42pm UTC](https://community.electricforum.com/t/what-gear-ratio-do-i-have/5696 "2015-12-24T19:42:03Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Todd](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/todd/32/1061_2.png) [@Todd](https://community.electricforum.com/u/Todd)\
**Post date:** [December 24, 2015, 7:42pm UTC](https://community.electricforum.com/t/what-gear-ratio-do-i-have/5696/1 "2015-12-24T19:42:03Z")

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I jacked up the front end, then slid the cover screen off my motor and marked the commutator, then I marked the tire and turned the tire 2 revolutions to 9 on the motor… That’s 4.5:1! that can’t be the gear ration, can it?

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**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\
**Post date:** [December 24, 2015, 7:59pm UTC](https://community.electricforum.com/t/what-gear-ratio-do-i-have/5696/2 "2015-12-24T19:59:22Z")

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Both wheels must move.  
Better to push the car one rotation while counting or you will be off .

9/1 ?

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**Author:** ![Old\_Houseboater](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/old_houseboater/32/544_2.png) [@Old\_Houseboater](https://community.electricforum.com/u/Old_Houseboater)\
**Post date:** [December 24, 2015, 8:03pm UTC](https://community.electricforum.com/t/what-gear-ratio-do-i-have/5696/3 "2015-12-24T20:03:07Z")

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Which comes out to 8.9 to 1. If you leave 1 wheel on the ground factor by 2.

Possible ratios are 8.9 10.35 12.44 and 14.76