After 4,000km of mud and rain, my right crank developed ~2mm of play. Giant/Dealer denied warranty, so I did a DIY fix. It’s cheap (3 bearings) and requires only standard BB removal tools.
1. Opening the Casing
Split the halves: Be extremely careful with the wiring harnesses connecting the two sections.
Condition: Despite heavy use, my internals were pristine—no water or corrosion. Note: Never use high-pressure washers.
2. Left Side: Axle & Torque Sensor
Removal: Disconnect the delicate electrical connector near the axle.
Procedure: Remove the torque sensor first, then the axle to access the bearing.
The Part: Standard 6805 LU bearing. Mine showed clear leakage/failure.
3. Right Side: Dual Bearings
Access: Remove the freewheel sprocket and main gear by gently tapping the axle from the outside with a rubber mallet.
The Parts: Two 6807 LU bearings installed in series. Replace both while the motor is open.
4. Reassembly & Lube
Clean: Remove all old grease thoroughly.
Grease Specs: Use synthetic, water-repellent, high-adhesion grease compatible with plastic/Teflon gears.
Safety: Use dielectric grease (e.g., Super Lube) to protect the control board from contact.
Result: Motor is now significantly quieter and smoother. Total cost was minimal compared to a full motor replacement!
1. Opening the Casing
Split the halves: Be extremely careful with the wiring harnesses connecting the two sections.
Condition: Despite heavy use, my internals were pristine—no water or corrosion. Note: Never use high-pressure washers.
2. Left Side: Axle & Torque Sensor
Removal: Disconnect the delicate electrical connector near the axle.
Procedure: Remove the torque sensor first, then the axle to access the bearing.
The Part: Standard 6805 LU bearing. Mine showed clear leakage/failure.
3. Right Side: Dual Bearings
Access: Remove the freewheel sprocket and main gear by gently tapping the axle from the outside with a rubber mallet.
The Parts: Two 6807 LU bearings installed in series. Replace both while the motor is open.
4. Reassembly & Lube
Clean: Remove all old grease thoroughly.
Grease Specs: Use synthetic, water-repellent, high-adhesion grease compatible with plastic/Teflon gears.
Safety: Use dielectric grease (e.g., Super Lube) to protect the control board from contact.
Result: Motor is now significantly quieter and smoother. Total cost was minimal compared to a full motor replacement!
