Moved By Bikes Shortboard RacksMBB Shortboard Racks build on the popular quick release bars of our Longboard Racks, but in a lower cost double seat post mount. If you only have short boards, usually boards less 7 8 feet in length, these racks are for you! Super quick and easy installation with a 4 bolt seat post clamp. The bars can be adjusted for angle and height to dial them in just the way you want them. Bars click in for use, or click out when they aren't needed, with a simple