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Old 04-16-2007, 09:34 AM   #1
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Default Gearing 13.5 on a JRXS

I'm sure this has been discussed but my searches don't turn anything up. I've got a 13.5 with a sintered rotor and I'm looking for gearing recommendations on a JRXS. Relatively short track. Thanks!
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Old 04-16-2007, 09:43 AM   #2
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On our shortish (about 72' straight) and tight layout we have been gearing around 1.38, or 35mm rollout. This is foams on carpet however. The motors are coming off at about 135-150 deg. F.

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Old 04-16-2007, 04:54 PM   #3
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you might want the smaller spur gear for the jrxs to gear it for a brushless because I believe that you have to gear the brushless pretty high and the losi with a stock spur will only do about a 33t pinion before the motor hits the servo
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Old 04-16-2007, 07:14 PM   #4
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I have my jrx-s geared at 40/128. I'm running rubber tires on an outdoor asphalt short tight track. My 13.5 comes off the track at 105-110 F and the esc(1711 Novak GTB is under 100F. My car has made believers out of a number of brush motor guys, just as much top end speed and killer amounts of torque out of the corners.
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Old 04-16-2007, 08:35 PM   #5
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For Rubber tire carpet with a sintered 13.5
I'm at 112 spur, 40T pinion (and it could handle more)

I use the spur adapter at:


and I use their 112 T Spur.

It works flawlessly on my type R


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