Description
Specifications
Documentation

These Pinion Kits are exactly what you need to replace a pinion gear in your Sport Gearbox. For complete mounting kits designed to help you switch which type of motor you are using with your Sport Gearbox, please see our Sport Gearbox Motor Mount Kits page.

Included Items:

Sport Gearbox 550 Series Pinion Kit (am-3767):
- 2 - M3-0.5 x 8 mm Socket Head Cap Screw with Thread Patch (am-1500)
- 1 - 16 Tooth 0.7 Module 0.125 in. Round Bore Steel Pinion Gear for 57 Sport RS-500 (am-3783)
- 1 - 0.515 in. ID 0.690 in. OD 0.250 in. Long Aluminum Spacer For 57 Sport (am-4081)
- 2 - M3 Lock Washer (am-1551)
Sport Gearbox 775 Series Pinion Kit (am-3768):
- 2 - M4-0.7 x 10 mm Socket Head Cap Screw (am-1264)
- 2 - M4 Lock Washer (am-1548)
- 1 - 16 Tooth 0.7 Module 5 mm Round Bore Steel Pinion Gear for 57 Sport RS-700 (am-3784)
Sport Gearbox CIM & NEO Motor Pinion Kit (Pre 2025) (am-3771):

Note: This version includes 1 in. long screws for motor blocks shipped pre 2025
- 1 - 16 Tooth 0.7 Module 8 mm Round Bore Steel Pinion Gear for CIM Sport (am-3785)
- 2 - 10-32 x 1 in. Socket Head Cap Screw (am-1056)
Sport Gearbox Kraken Uncut Shaft Pinion Kit (am-5582):
- 1 - 1/4-20 x 0.5 in. Button Head Cap Screw (am-1739)
- 1 - 16T Mod 0.7 SplineXS Kraken Motor Pinion (am-5434)
- 2 - 10-32 x 0.625 in. Socket Head Cap Screw with Nylon Thread Lock Patch (am-1120)
Sport Gearbox CIM & NEO Motor Pinion Kit (am-3771a):
- 1 - 16 Tooth 0.7 Module 8 mm Round Bore Steel Pinion Gear for CIM Sport (am-3785)
- 2 - 10-32 x 1 in. Socket Head Cap Screw (am-1056)
Sport Gearbox Minion Pinion Kit (am-5616):
- 1 - 8 mm ID 0.500 in. OD 0.500 in. Long Aluminum Spacer (am-1751)
- 1 - Kraken/Minion Sport Gearbox Pinion (am-5434)
- 5 - 10-32 x 0.500 in. Socket Head Cap Screw with Nylon Thread Lock Patch (am-1744)
-------------------------------------------------------------------------------------

CIM / NEO Pinion Installation:
The 16 tooth pinion gear for the CIM / NEO does not use a key for torque transfer. There are two possible methods of installation of this pinion on a CIM or NEO style motor.
- If the tolerances of both the motor shaft and the pinion are in your favor an arbor press (possibly up to 3 tons) is required to install this pinion due to the intended interference fit (0.001 - 0.002 in.). In the Sport gearbox these pinions are designed to press flush to the end of the shaft.
- If the tolerances are not in your favor and the pinions slip on the shaft, or you feel that the press fit it too weak, an adhesive is required to transfer torque. The procedure is the same for all motors.
  - Apply a few rings of red Loctite to the shaft, and the bore of the pinion, then slip the pinion onto the shaft so that it is flush with the tip of the shaft.
    - Red Loctite has been tested to a factor of safety of 4x the stall torque of a CIM when let to cure for 24 hours.
If you are are unable or uncomfortable performing these procedures, we recommend purchasing a motor with the pinion pre-installed. They are available as am-0255_16T for the CIM and am-4258a_16T for the NEO.

Banebots Gearboxes and Parts

Sport Gearbox Pinion

Sport Gearbox Motor Blocks

Ratchet Sport Servo Arm

Sport Gearbox Motor Mount Kits

Sport Gearbox Face Mount Flange

NeveRest Sport Motor Mounting Kit