This ultra-affordable rooftop bike mount features a pivoting wheeltray for added flexibility. Add the Boa to a standard Yakima car rack system, or use it on a Warrior-style cargo basket for a truly mammoth combination of gear- and bike-hauling capability. -Pivoting wheel tray fits crossbar spreads 32 - 50in -SKS-lockable skewer (SKS LOCK CORE sold separately) -Compatible with most disc brakes -Fits car rack systems with round and square crossbars