Repairing a Brose e-bike motor: which parts are available for Drive C, S, T and TF
Yes, a Brose e-bike motor can be repaired: freewheels, drive belts and the crankshaft are available as individual parts. The operating manual, however, only provides for repairs by a specialist dealer. This guide explains what it says and which parts we stock for the Brose Drive C, S, T and TF.
What the operating manual says about opening the motor
The operating manual of the Brose S Mag in the version for the FIT system (version dated 6 June 2025) says that you should not open the drive unit yourself and that it may only be repaired by qualified specialists using original spare parts. It also states that opening the drive unit without authorisation voids the warranty claim. For repairs the manual refers to the specialist dealer, because they require specialist knowledge and special tools.
If your bike is still under warranty or guarantee, go to your dealer first.
First identify the series and the housing
Brose presented the “Drive” family in 2017: the Drive T for everyday use, the Drive S for sporty riding and the Drive TF with assistance up to 45 km/h. Then there is the Drive C. Each of these series exists with a housing made of aluminium (Alu) or magnesium (Mag). We do not stock parts for other Brose motors.
For most of the parts below the series makes no difference: according to the product page, the freewheels, crankshaft and lockring fit the Drive C, S, T and TF with Alu and Mag housing. Only for the belt kit does the housing decide.
Freewheels
A Brose motor has two freewheels: one on the crankshaft and one in the belt pulley. If the crank spins freely when you pedal, one of them is the first suspect. How to narrow it down is explained in the guide Brose freewheel failure: when the crank suddenly spins freely.
- For the crankshaft: Original part BROSE127, suitable for Brose, €44.95 · PLB20127 with metal cage, suitable for Brose, €39.95 · Heavy Duty with reinforced sprags, suitable for Brose, €54.95.
- For the belt pulley: Original part BROSE126, suitable for Brose, €44.95 · PLB20126, suitable for Brose, €39.95 · Heavy Duty with reinforced sprags, suitable for Brose, €54.95.
Drive belt
In the Brose motors Drive C, S, T and TF a toothed belt transmits the power from the electric motor to the drive. For the belt kit the housing decides:
- Belt kit for Alu housing (Drive C, S Alu, T, TF), original part, €69.95.
- Belt kit for Drive S Mag, original part, €94.95: belt, housing seal, bearing protection ring, O-ring, grub screw and housing screws.
How to recognise a torn or slipping belt is explained in the guide Brose motor: belt snapped or slipping? Symptoms, the right belt kit and costs.
Crankshaft, lockring and tool
- Crankshaft, original part, suitable for Drive C, S, T, TF (Alu and Mag), €39.95.
- Lockring, original part, suitable for Brose, €14.95: holds the chainring carrier on the motor.
- Assembly tool (spider) for the lockring, suitable for Brose Drive C, S, T, TF, €29.95. Brose uses a right-hand thread, unlike Bosch. The tightening torque and the steps are in the guide Undoing the lockring and changing the chainring: avoid the costly mistakes.
- For the motors in Specialized bikes (1.2, 1.3, 2.1, 2.2, 3.1) there is a separate assembly tool, suitable for Specialized, €29.95.
- FSA crank arm set CK-220 (170 mm, ISIS), suitable for Brose Alu and Mag up to model year 2025, €29.95.
All prices at bikely, as of 18 October 2026.
What you should know before buying
- Which part is worn only shows once the motor is open. A noise alone does not prove damage. How to rule out other causes first is explained in the guide E-bike motor clicking or grinding? Causes and repair instead of replacement.
- Fitting is a job for a workshop that repairs e-bike motors. We sell the parts, we do not fit them.
- Which parts are original Brose parts and which come from other manufacturers is stated on the respective product page.
- What a repair costs compared with a replacement motor is explained in the guide How much does an e-bike motor repair cost? Bearings, belt, freewheel or replacement motor compared.
What the manual says about care
Never immerse the motor in water and never clean it with a high-pressure cleaner, water jet or compressed air, do not use cleaning agents, but wipe it with a damp, soft cloth. Only replace components on the motor with identical parts or parts approved by the manufacturer for your bike.
Matching parts: Brose spare parts · Freewheels · Belts
Sources: Operating manual Brose S Mag FIT motor, version 02 (German) · pedelec-elektro-fahrrad.de: Brose presents the Drive product family (29 August 2017, German). Read on 16 October 2026.
