I was using my Rival MT10 and suddenly it started to make a grinding noise as the Motor Pinion lost the Screw that holds it in place. It chewed up the Spur Gear even completely taking off some of the teeth leaving nothing but plastic shavings inside the cover. I got a couple just in case it happens again but using some Thread Lock on the Pinion Screw it should be a lot better now. I also took several measurements of the Spur Gear and have 3d Printed one using PLA+ as a test that does exactly mesh with the Spur Gear fits perfectly on the Center Differential but have not tried it out yet.
Moose Moss
Verified Owner
Monday, Aug 1 2022 (about a year ago)
Team Associated Rival MT10 Spur Gear (54T)
Used on my pro4 sc10 and it fits and works amazing. Idk if this is stock for the pro4 sc10 but it works amazing.