Steel Motor Pinion 21T Compatible with 1/48 Scale - Kyosho UM321C  [KY-UM321C]

Kyosho UM321C - Steel Pinion Gear(21T)1/48
Price:
AUD$0.00
Brand:
Kyosho
Model:
KY-UM321C
GTIN:
4548565271634
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Spares / Hop-ups - Kyosho - RB6.6 spare parts category
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Precision 21T Motor Pinion for 1/48

The Kyosho UM321C is a 21-tooth steel pinion crafted for 1/48 scale radio-controlled drivetrains. It provides consistent tooth contact and improved resistance to wear compared to softer materials, making it a solid choice for tuning.

For setup, adjust the pinion position for correct mesh, ensure axial alignment on the motor shaft, and secure the set screw with care. Run a low-speed check to confirm smooth rotation and recheck after a few minutes of use to catch any loosening or misalignment.

Specifications

  • Item: Steel Pinion Gear
  • Material: Steel
  • Model Number: UM321C
  • Compatibility: 1/48 scale RC models

This 21T steel pinion is a practical upgrade or replacement for small-scale RC drivetrains where predictable gear engagement and durability are priorities.
Remark :
Due to limited stock availability, please notice that some Kyosho items may have to order from the factory and the ready time is around 4-6 weeks. Customer purchases the item is assumed to accept the waiting time which allows us to order directly from the manufacturer if the item is out of our warehouse.

How does changing to 21T alter performance?

Tooth count affects the overall gear ratio: increasing teeth on the pinion generally raises top speed but reduces low-end torque. Match the pinion size with an appropriate spur gear to achieve the desired balance.

Should I change the spur when altering pinion size?

If you change pinion teeth to alter gearing, adjust the spur gear accordingly to keep motor load within safe limits. Small changes can significantly affect acceleration and top speed.

Any setup tips to improve acceleration?

Ensure exact mesh with minimal backlash, confirm pinion runs true on the shaft, and keep bearings clean to reduce parasitic drag that hurts acceleration.

Can this handle higher power setups?

Performance depends on motor output and operating conditions. Verify the pinion mounts securely on the shaft, monitor for heat and wear, and inspect the mating spur after heavy runs.

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