The stock inner bearings are a mere 20x27x4mm

excellent throttle and brake feel

incredible efficiency

Driving feeling feels good in onroad & offroad cars

2V) 6000mAh LiPo

Hot Racing - Steel Spur Gear, Heavy Duty, 42 Tooth, 1.0 Modulus HPI160557 The stock inner bearings areFor the Traxxas Revo 3. 3 and Slayer Pro 4 x 4. Features: CNC machined and lightened hardened steel construction Upgrades factory plastic gear Super heavy duty 1. 0 Mod pitch Black oxide coating for durability and corrosion resistance Red anodized countersunk washers Specifications: Number of teeth: 42 Gear pitch: 1. 0 module Mounting holes: 3 Tooth face width: 6mm