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RockyMounts Droptop Adjustable Top Mount


This RockyMount DropTop adjustable top mount will allow you to secure your bicycle to the Bolt It On crossbar. The mount is able to move in any direction on the crossbar. You can secure your mountain bikes, E-bikes, road bikes and more!

The DropTop mount utilizes a TPU overmolded shim to allow for both 12mm and 15mm axles to fit without the need for switching shims out. It is based upon the same clamshell design as the DriveShaft series, which allows for easy loading and adapts to minor differences in axle diameter or contouring. 


  • Installs in under 1 min
  • New Gen 2 Technology
  • Adjustable
  • Rotate in any direction
  • Locking
  • Installs anywhere on crossbar


  • Locking thru-axle mount
  • Compatible with 12mm, 15mm, & 20mm thru axles up to 110mm wide (for 20mm, shims must be removed)
  • Vertical and horizontal mounting positions
  • TPU overmolded shim eliminates the need to switch out shims for 12mm or 15mm axles
  • Anti-Theft: TPU surface provides sufficient friction to stop the axle from being removed when DropTop is firmly clamped and locked
  • Can fit QR bikes with our 9mm QR with Dummy Axle – sold separately
  • Wide mouth opening to easily load your bike and a locking T-Bolt that adjusts for a tighter hold so the thru-axle cannot be removed when locked
  • Lock core, keys, and Track Hardware Included
  • Laser Cut
  • Powder coated
  • Steel
  • Proudly made in the U.S.A.


  • (1) Bolt It On bike bracket
  • (1) Thru axle mount with lock
  • (1) Lock core and keys included