Traxxas 21-T 32-P Heavy Duty Machined Hardened Steel 3mm Shaft RC Pinion Gear - 3951X

The Traxxas 3951X is a 21-tooth, 32-pitch pinion gear machined from hardened steel, designed to fit motor shafts with a 3mm diameter and secured with a set screw. Supplied as part number TRX3951X, this heavy-duty RC pinion gear is a direct-fit replacement or tuning option for a wide range of Traxxas electric models. The 32-pitch tooth profile is a common standard across Traxxas' lineup, making it a straightforward match for compatible vehicles running a 32-pitch spur gear setup. The machined hardened steel construction offers greater durability than standard sintered gears, which is particularly relevant if you're running higher motor temperatures or increased torque.

Key Features

• 21-tooth, 32-pitch profile for use with standard Traxxas 32-pitch spur gears
• Machined from hardened steel for increased wear resistance compared to standard sintered pinions
• Designed for motors with a 3mm shaft, secured firmly with a set screw
• Direct-fit replacement that suits a broad range of Traxxas electric RC models
• Tooth count affects final drive ratio — a 21T pinion is a mid-range option balancing acceleration and top speed

Compatible With

• Traxxas models listed under parts fitment codes: 107154-1, 108046-1, 108076-1, 108164-1, 110056-4, 67097-4, 67376-4, 68277-4, 68386-4, 82044-4, 82216-4, 82224-4, 82246-4, 82256-4, 82276-4, 88086-84, 88296-4, 92046-4, 92056-4, 92076-4, 92086-4, 92144-4, 92154-4, SNAPON17
• Requires a motor with a 3mm output shaft
• Must be paired with a compatible 32-pitch spur gear

What's Included

• 1x Traxxas 3951X 21-tooth hardened steel pinion gear (32-pitch, 3mm shaft)
• 1x Set screw