Spur options
Hi. There is an alternative answer to your problem:
The Tamiya Buggy Champ 2010 uses a spur gear that would fit. there are two choices; a 65 tooth, and a 70 tooth, and both are sold together under part number: 9808256. However, you would then have to use Tamiya Pinions because of the pitch. I haven't tried this approach yet, so i'm not sure what pinion sizes will fit?, but i'll let you know if i get it working.
Also, i think 3.25 f.d.r. is a bit of a long ratio for that class, it depends upon your ESC, with a turbo ESC you could get away with it, but my Nosram/SPV3 17.5 tends to overheat beyond 4.09 f.d.r.
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