eBike mid-drive motor maintenance: Bafang, Bosch, Avinox — what and when

Unlike a standard bike, a central motor e-bike has mechanical + electronic components under constant voltage. Poor maintenance results in:

• Progressive loss of torque
• Overheating and motor failure
• Premature wear of internal reduction gear
• Water ingress (poorly managed high-pressure washing)

### Every 500 km or monthly Do it yourself :

• Clean the motor housing with lukewarm water + mild soap (never direct high pressure on the housing)
• Check crank arm tightness (24 Nm) with a torque wrench
• Visually inspect connectors (oxidation, water)
• Lubricate the chain (transmission is under more stress than a standard bike)

### Every 2000 km

• Check bottom bracket play (if any, disassembly needed for retightening)
• Test each assistance mode (mode not responding = failing sensor)
• Measure actual range vs new (>30% drop = battery needs examining)

### Every 5000 km — workshop

• Housing removal + reduction bearing verification
• Internal cleaning and specific grease application (lithium grease NLGI 2)
• Firmware update via Bafang Config Tool
• Torque sensor test under load

### Bafang wear parts

• Nylon reduction gear: ~15,000 km, replacement €25
• Bearings: ~20,000-25,000 km
• Torque sensor: ~15,000-20,000 km (loss of precision)

### Every 1000 km Do it yourself :

• Check that the display shows no warnings (Maintenance Indicator on Kiox/Flow)
• Quick test: climb a familiar hill, compare assistance time vs when new
• Inspect battery connector (most heavily cycled)

### Every 5000 km — mandatory workshop Bosch requires a motor service via DiagnosticTool:

• Reading of silent error codes (internal logs)
• Motor + battery firmware update
• Torque sensor calibration
• IP54 waterproofing test (if bike experienced heavy rain)
• Cost: €80-120

### Every 10,000 km — comprehensive service

• Partial motor disassembly
• Internal seal verification
• Preventive replacement of reduction gear if wear signs visible
• Cost: €250-350

### Smart System specificity (since 2022)

• ConnectModule update at each service (otherwise AutoLock, eBike Lock can malfunction)
• Verification of ConnectModule SIM subscription (if activated)

### Bosch wear parts

• Torque sensor: ~30,000 km (Bosch uses a more robust magnetostrictive sensor)
• Seals: ~20,000 km
• Nylon gear: 25,000-30,000 km

### Every 1000 km

• External cleaning — IPX6 rated so tolerates slightly more water than others
• Crank arm tightness verification (28 Nm specific to Avinox)
• Firmware update via DJI app (OTA, free)

### Every 5000 km

• Torque sensor calibration via app (guided procedure 5 min)
• Internal logs verification via app (DJI publishes a health report)
• Cost: €0 if done via app

### Every 10,000 km — workshop

• Dismountable motor service (DJI publishes a procedure)
• Expect ~€150 at an Avinox-trained workshop
• Issue: few EU workshops trained as of 2026

### Avinox wear parts

• Unknown in practice (launched 2024). DJI announces 250,000 km without major replacement.
• 2-year warranty + optional 3-year extension (€50)