The FR-4 is designed to fit the 20-spline tool fittings found on older SunTour® freewheels. Constructed from heat treated alloy tool steel, the FR-4 features a 1" tool fitting for use with an adjustable wrench, socket, or bench vise.
If you ever need extra cargo space for your bikepacking trip, this is it. The Trail Rack has a top platform for versatility and side rails for panniers, making it unmissable for outdoor adventures.