If you ride a mountain bike that has a 15mm or 20mm through axle (you know who you are – downhillers!), you’re going to need one of these adapters to mount your bike on the SeaSucker rack. The Delta Bike Hitch Pro fork mounts that come on the SeaSucker racks that RackBoy! sells have a standard 9mm skewer. The Fork Up adapters clamp into the fork mount on the bike rack, allowing you to attach your forks.
Fork Up 15mm Adapter
Fork Up 20mm Adapter
Fork Up in use.