Brose Belt Maintenance Kit – S Mag Motors / Specialized Gen2

The Brose Belt Maintenance Kit is designed for Brose motors with magnesium housing (Brose S Mag).

This kit enables the recommended service of Brose Mag and Specialized Gen2 motors, which use a internal drive belt. Preventive belt replacement improves motor efficiency, reduces operational noise, and extends internal drivetrain longevity. The kit contains the essential components required for a full service according to manufacturer standards.

No recommended interval is available from the manufacturer, but in BiciFix we recommend the change every 3-5000kms. With extreme use (enduro or excessive use of Turbo mode, 2-3000kms).

This kit includes the new reinforced drive belt, offering improved durability and performance. Change of the belt  requires removal of motor from the bike and use of specific instruments and greases. If you are located in Spain, in BiciFix, we can do this Brose motor service for you.

If your motor still has the original pre-2020 belt, it’s strongly recommended to upgrade to this reinforced version to prevent premature wear or belt failure.

Important:
If the belt has already broken, a complete internal cleaning of the motor is essential — belt fragments can damage the internal planetary plastic gears if left inside.

Kit Contents:

• Reinforced Carbon Belt

• New Magnesium Screws (must always be replaced; magnesium hardware is single-use)

• Main Motor Housing Gasket

• Bearing Seat O-Ring(for the rotor support bearing located in the cover)

Installation Tip:
Apply a thin layer of petroleum jelly (vaseline) on the belt before installation. Adjust the tension after closing the motor  with a calibrated torque wrench to 0.2 Nm.

Compatibility:

Compatible with all Brose motors with magnesium housing, including:

• Brose Drive S Mag

• Brose Drive C Mag

• Brose Drive T / TF / H Mag

• Specialized Turbo 2.x systems

Used in models from Specialized, Fantic, BH AtomX, Bulls, Rotwild, Decathlon, and other e-bike brands.

Common examples:

• Specialized Turbo Levo Gen2 / Gen3

• Specialized Kenevo Gen2

If you’re unsure which motor your bike has, feel free to contact us for confirmation.