Yokomo YOKR12-6490 90T 64-Pitch Precision Spur Gear for R12 Chassis (Black)  [YOKR12-6490]

90T 64-Pitch Precision Spur Gear for R12

The Yokomo YOKR12-6490 is an RC-scale precision spur gear intended for R12 chassis setups, offering a 90-tooth count with 64-pitch specification for predictable gear engagement. Its description emphasizes precision tooth geometry to suit fine tuning of gear ratios without changing the pinion, making it a component for balanced on-road drivetrain adjustments.

Fitment and role: this part is designed to work with R12-series configurations that accept 64-pitch gearing, serving as the main large gear that meshes with the motor pinion to define the overall gear ratio. When you change the spur tooth count, expect adjustments in acceleration and top speed characteristics at the scale level, so use this gear when you need incremental tuning rather than wholesale drivetrain changes.

Installation notes: confirm your chassis uses 64-pitch gears before fitting, check gear mesh with the motor pinion for a uniform contact pattern across the tooth face, and ensure the spur sits flush on its mounting hub with no lateral play. Always verify bearing support and drivetrain alignment after installation to avoid uneven wear; this is an RC-scale accessory and should be handled with scale-appropriate tools and practices.