The gear up extra bike kit bua aluminium racks come as standard with the fittings to hold two bikes but up to two more bikes can be added using extra kits gear up extra bike kit features bua aluminium racks come as standard with the fittings to hold two bikes but up to two more bikes can be added using extra kits vinyl coated arms hold and protect your bike and the patented trak rak system allows them to be independently and infinitely adjusted to accommodate many shapes and sizes