With a new frame and motor for this year, the 5th generation Trek Rail+ is packing a bigger battery and a whole lot more ...
The best method to attach the Carback is directly to the saddle. If you ride with a Trek or Bontrager saddle, you can attach a Blendr mount directly to the shell with an adapter (sold separately).
Trek’s 5th Gen Rail+ also has a range of adjustment ... Every build option will be on RockShox suspension packages, Bontrager wheels, and SRAM brakes (except for the Deore build).