Spur Gear 81T 48 Pitch Compatible with 48 Pitch Gearboxes - Yokomo YOKSG4881  [YOKSG4881]

Fitment and longevity guidance

This Yokomo YOKSG4881 spur gear is a 48 pitch, 81 tooth replacement item for RC models using 48 pitch gearing. It is intended for applications where tooth count changes are used to adjust the mechanical advantage and influence durability under load. The paragraphs that follow emphasise fitment checks and practices that help extend service life.

Compatibility: this item is for 48 pitch drivetrains and gearboxes designed for 48 pitch spur gears; double-check your chassis run gear pitch before installation. Moving to an 81-tooth spur increases the gear reduction compared with smaller spurs, which commonly enhances torque delivery but reduces peak speed for the same motor and pinion setup.

Installation notes: remove or adjust slipper and motor mount clearances as required for your chassis, set precise backlash to avoid accelerated tooth wear, and ensure the motor pinion is aligned with the spur center to prevent side loading. Perform a cautious run-in at low throttle while listening for irregular noises, then inspect mesh and fasteners and make final adjustments.

Tuning role: using an 81-tooth spur is a straightforward approach to shift acceleration and throttle feel without modifying motor or ESC hardware. Coordinate spur choice with pinion selection to achieve your desired overall ratio, and always verify that the new gear clears the chassis, housings, and any aftermarket components.