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Old Jan 20, 2013, 08:25 PM
Mad Matt is offline
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SC10 4x4 - 32 Spur gear / pinion selection??

Hello my fellow radioheads,

I am in the research phase of building a new SC10 4x4 Short Course truck. I have been out of the hobby for about 10 years so there are things I don't know or remember. I am looking for some clarity for my new build's gearing.

I watched several YouTube videos on the truck and I hear everyonr saying use 32 tooth spur gear but I am not getting the information on a pinion.

I am planing a Reedy 540-SL 3900kV brushless motor but Reedy doesn't provide any information on number of turns etc. I don't want to have a motor gear ratio that cooks the solder off and I don't need a rock crawler torque set-up either, just a good center line racing set-up for use at my local track.

So can someone help me out here??
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Old Jan 20, 2013, 08:51 PM
mredzadventure is offline
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USA, MI, Hastings
Joined Jan 2007
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The best bet is going to see what guy's are running at your track. I would check the manual for your final gear ratio is I would start with about one tooth up or down and see how it goes.

This is a link to some of the factory drivers set-ups Maybe this might help for a starting point. 2wd 4wd
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Last edited by mredzadventure; Jan 20, 2013 at 09:02 PM.
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Old Jan 21, 2013, 10:27 AM
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Are you sure they said 32 tooth and not 32 pitch?

Here's the manual with parts listings:

The stock spur is either 32 pitch 62 teeth or 48 pitch 93 teeth (both are apparently in the kit). The RTR version runs a 62 tooth (32 pitch) spur with a 14 tooth pinion.

The RTR uses a 550 3500kv motor (longer rotor means a bit more torque), so you'll want to drop a couple teeth from the RTR gearing to the motor you want to run.
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