When diagnosing whether a driver assembly is salvageable or requires outright replacement, baseline factory specifications highlight where the assembly has warped or worn past safe tolerances.
| Hub Component | Factory Specification | Wear Limit / Failure Sign | Corrective Action |
|---|---|---|---|
| BMX Axle Nut Torque | 40, 45 Nm (approx. 30, 33 ft-lbs) | Exceeding 55 Nm crushes internal tube spacer | Replace inner spacer; re-torque with calibrated wrench |
| Driver Bearing Size (Kush 2) | 6802RS or 15267RS (Sealed Cartridge) | Notchy rotation; lateral play >0.5mm | Blind-bearing puller extraction; press new pair |
| 9T Micro Driver Cog Teeth | Symmetrical tooth profiles, 1/8" pitch | Cassette cog teeth wear showing hooked profile | Full 9T micro driver replacement alongside chain |
| Pawl Leaf Springs | Spring steel circlip or 3, 4 individual leaves | Flattened leaf, sluggish return, or fractured arm | Install new spring kit; re-align pawl orientation |
