I concur with Ryan with my X12/78/22. It's true the X12's do run quite a bit hotter than other motors - certainly compared to my Ballistics on same wind/spur/pinion, so I've always been careful in not over-doing the pinion size.
I guess it also depends on the track size and complexity. The smaller the track and higher the technicality the lower the pinion as top speed is not so relevant.
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Originally Posted by ryan_93
i run 22-23 pinion and 78 spur with an lrp x12 7.5
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