The Subrosa Street Rail XS Kit was designed for both new and young riders who may not have the hops necessary to ride a standard height Subrosa Street Rail. The XS kit includes two new legs that lowers the Street Rail from stock 18" height, to a more manageable 12", while still remaining tall enough to grind a 20" BMX bike. Not only is this height ideal for new 20" BMX riders, but also works well with 16" bikes, 18" biked, scooters and skateboards.