# More speed with oversize tires

**URL:** <https://community.electricforum.com/t/more-speed-with-oversize-tires/18256>\
**Category:** GEM Forum\
**Created:** [March 8, 2020, 1:08am UTC](https://community.electricforum.com/t/more-speed-with-oversize-tires/18256 "2020-03-08T01:08:29Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![BigT](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/bigt/32/6237_2.png) [@BigT](https://community.electricforum.com/u/BigT)\
**Post date:** [March 8, 2020, 1:08am UTC](https://community.electricforum.com/t/more-speed-with-oversize-tires/18256/1 "2020-03-08T01:08:29Z")

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New here !  
I have a 2005 Gem E4. Just bought. Put new shocks, tires(Dura Scorchers 22x11x12) & rims.  
Raise back fender. Everything fits great. Ordered the R4F motor. No reprogramming controller per R4F for a 2005. Supposed to be able to get 35 plus. The shop that did everything said programming controller is a must, based on tire size. Motor a lone won’t get the speed. Is this true ? I like the look. But want the speed. There’s a lot of Gems with left kits and big tires.

Please advice. Thanks

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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:** [March 8, 2020, 2:06am UTC](https://community.electricforum.com/t/more-speed-with-oversize-tires/18256/2 "2020-03-08T02:06:20Z")

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Motor won’t add much speed. High voltage or taller gears, less money more speed.