Hot Racing Steel Mod 1 Steel Spur Gear for Traxxas E Revo 2.0/X-Maxx/XO-1The Hot Racing hardened steel Mod 1 spur gear is an optional upgrade for the Traxxas E Revo 2. 0, X Maxx 6S and 8S, Maxx 4S and XO 1 models. Choose from 50, 52 and 54 tooth options. NOTE: Do NOT use the pin system for setting the X Maxx gear mesh. Instead, manually set the gear mesh without the pins. Refer to the Traxxas manual for instructions (ref. pg. 22 Adjusting Gear Mesh) With the pins removed, use the four 4x16mm button head cap screws on the