Parts & Accessories

Know what's coming. Ride with extra confidence with Trek CarBack Radar Rear Light. CarBack's radar helps detect rear-approaching vehicles from up to 240m and provides audio and visual alerts through paired GPS head units for increased on-bike awareness. Built with integrated best-in-class Daytime Running Lights that are visible from up to 2km away, CarBack is a must-have for every cyclist riding on shared roads. - CarBack can detect and alert riders of rear-approaching vehicles from up to 240m away - Compatible with most cycling GPS computers - Pair CarBack with the Trek Accessory app to see a vehicle's rear-approaching and passing distance on your smartphone - Designed with focus, flash, and range to be Daytime-visible from up to 2km away - Four light flash modes: Day Flash 90LM, Day Steady 25LM, Night Steady 5LM, and Night Flash 5 LM - Visible fuel gauge LEDs make it easy to see CarBack's 7+ hour battery status - IPX7 waterproof rating to confidently ride through wet conditions - Includes Quick Connect Plus rear mount and USB-C charging cable

Mounts to the Knock Block frame chip display tabs on Rail Gen 2 to mount the Bosch Kiox display behind the stem to keep your cockpit spotless.

Features
- Not Bosch Smart System compatible
- Designed for Rail Gen 2 frames
- Refer to Service Manual for assembly instructions and service

The right parts for the right bike.

Features
- Compatible with Carbon and Aluminum
- Refer to Service Manual for assembly instructions and service

Specific for Bosch Smart Systems.

Features
- 970mm cable length
- Mounting hardware not included

Original replacement battery holder for your Domane MKIV.

Features
- For use with Shimano internal Di2 battery
- For installing a Di2 battery in your bike's seat tube
- Integrates seamlessly with the frame

Keep your bike operating as it should.

Features
- Diametrically magnetized to improve sensor reception
- For use with 6-hole disc rotor mounts
- Compatible with rear dropout sensors only

Original replacement battery cover for your Powerfly.

Features
- Refer to the Service Manual for assembly & service instructions
- Hardware sold separately

Use a smaller battery in your 750Wh or 625Wh RIB battery slot.

Features
- For use with Bosch Smart System batteries only
- Used in 750Wh battery slots with 625Wh batteries
- Used in 625Wh battery slots with 500Wh batteries
- Not for use in 750Wh battery slots with 500Wh batteries
- Hardware is not included
- Refer to Service Manual for assembly instructions and service

Foam pads to help reduce movement of the battery inside a RIB cavity.

Features
- Compatible with all RIB equipped models
- Refer to Service Manual for assembly instructions and service

The extension cord is an optional item for the SRAM AXS drivetrain, powering the derailleur from the e-system battery instead of a separate AXS battery.
Integrating into the derailleurs AXS battery port, the cord routs through the bicycle frame into the e-system drive unit.

Features
- Works with any AXS derailleur
- Powers derailleur by main e-system battery