The Blackburn Central Seatpost Rear Rack is perfect for bicycles with no braze-ons, it mounts just to your seat post. Versatility and simplicity are the virtue of this design. The rack deck can adjust fore and aft, but also flip over to better fit different sized bikes. The beauty of this rack is that it requires no frame mounts. The Blackburn Central Seatpost Rear Rack will mount to just about any size bicycle.