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If you own a new Trek MY19+ Madone SLR, MY20+ Domane SL/SLR & MY20+ Madone SL. and have the Trek Integrated Seatpost Light Mount (Trek model W561410) This adapter will slide right into place and allow you to mount a Garmin Varia device. Works with all newer Varia models RTL 510 and above (The original Varia model RTL 500 is physically too large to mount in this location). Slide the adapter into the Trek mount then you can install your Garmin device in place of the Bontrager light.
Please check with your local Trek dealer to see if your model year bicyle can use the Trek part listed above.
Three variants are available, please double check that you have selected the correct size. The SMALL version is compact and only extends 8 mm beyond the face of the Trek part. The MEDIUM protudes rearward an additional 10 mm making the total 18 mm from the Trek part. The LARGE is offset downwards 30 mm and extends rearward approximately 12 mm. The LARGE also hasd the additional functionality of accepting an Apple AirTag on the rear section of the Garmin socket.
SMALL = original adapter MEDIUM = Extended additional 10 mm rearward LARGE = Offset downward 30 mm and includes a snap in location for Apple's AirTag
This product or service is not affiliated nor endorsed by the Trek Bicycle Corporation, Apple Inc. or Garmin, Ltd. All trademarks belong to the respective owners.