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

Precision 90T 64-Pitch Spur for R12

The Yokomo YOKR12-6490 is an RC-scale precision spur gear made for R12 chassis layouts, supplying 90 teeth in a 64-pitch format to promote predictable gear engagement. The description highlights accurate tooth geometry intended for fine tuning gear ratios without replacing the pinion, helping achieve balanced on-road drivetrain behavior.

Fitment and role: this component is intended for R12-series setups that use 64-pitch gearing, acting as the primary large gear that meshes with the motor pinion to set the overall gear ratio. Changing the spur tooth count produces measurable shifts in acceleration and top speed characteristics at the scale level, so select this gear when you need incremental tuning rather than a full drivetrain overhaul.

Installation notes: verify your chassis accepts 64-pitch spur gears before installation, set gear mesh with the motor pinion to obtain uniform contact across the tooth face, and confirm the spur sits flush on its mounting hub with no lateral movement. Check bearing support and drivetrain alignment after fitting to prevent uneven wear; treat this as an RC-scale part and use appropriate tools and care.