21 Tooth 32 Pitch (0.8 mod) Pinion Gear for the Traxxas E-Maxx Truck. gear which is attached directly to the motor. FEATURES: Machined Steel Designed for a 3mm shaft YOU WILL RECEIVE: One 21 tooth Pinion Gear with 1/8 inch bore One 3 x 4mm Set Screw REQUIREMENTS: Assembly onto an E-Maxx truck. 1.5mm hex wrench to tighten set screw. COMMENTS: This gear is only one of two which are used on the E-Maxx dual motor set-up. description revised by: DB November 16, 2012