HRP High-Speed idler gear 24T (48P) - GRK5-R

TheR31S129 HRP High-Speed Idler Gear 24T fromR31 House is a reinforced idler gear designed for the transmissions of theGRK5-R / GRK-R motor unit, designed to improverotational speed, reliability, and drivetrain consistency.

Developed under the supervision ofHayato Yoshiba, this model benefits from advanced optimization of theresin materialand the manufacturing process, offering an excellent balance oflightness, strength, and mechanical efficiency.

The bearing housing has been specifically adjusted to account forthermal expansion, ensuring stable operation even during long sessions at high temperatures.

Thanks to its “High-Speed” design, this gear promotes a freer and more efficient transmission, ideal for drift setups requiringhigh responsiveness and quick throttle response.

This model has been validated in competition, notably inSDC, where it contributed to top-level performance.

• Brand:R31 House

• Reference:R31S129

• Type:reinforced idler gear (intermediate gear)

• Number of teeth:24T

• Pitch:48P

• Material:optimized high-performance resin

• Development supervised byHayato Yoshiba

• Precise bearing seat fit (thermal management)

• Compatible with:GRK5-R / GRK-R motor unit

• Optimized forspeed and transmission smoothness

• 1 × 24T idler gear

👉 An optimized idler gear directly affects:

• thedrivetrain smoothness

• thethrottle response

• theloss of mechanical efficiency