(828) 412-2632, M-F 9am-5pm ET [email protected]

Extra Mr. Fusion Seat Post Clamp


Extra seat post clamps to swap Mr. Fusion between multiple bikes that have different seat post diameters.

This product is just the seat post clamp and is meant for existing owners of Mr. Fusion that wish to install the seat pack system on multiple bikes that have a different seat post diameters.


  • CNC’d 6061 aluminum
  • Ships with stainless steel bolt, washers, and locking nut.
  • Machined in Calgary, Canada

♦ Not compatible with carbon posts, suspension posts, or dropper posts. ♦


This product was developed by Porcelain Rocket; a Canadian company widely credited as being pioneers in the modern era of bikepacking bags. They developed many ground breaking designs including the first fully stabilized seat pack and the first 100% waterproof framebag.

Today, Rockgeist continues the legacy of Porcelain Rocket by partnering with them to manufacturer their welded, waterproof designs in our workshop located in Asheville, North Carolina.


Additional information

Weight 0.3 lbs
Seat Post Clamp Size

27.2 mm, 30.9 mm, 31.6 mm


Choose the seat post clamp size that matches the diameter of your seat post. Mr. Fusion mounts directly to the seatpost of your bicycle, not to the bicycle frame itself. So, you will want to choose the clamp size that is the same diameter as the seatpost that your bicycle uses.

Not compatible with carbon posts, suspension posts, or dropper posts.