TMS% TruckBedBikeCarrier-PB4 Bike Carrier Rack (4 Bicycle, Truck Pick up Bed Mount Full & Compact New) Designed for use with up to four bikes of varying rim/wheel size Fits both full size and compact size truck beds, securing fully assembled bikes with rim sizes ranging up to 28" Secures along the inner walls of your truck bed utilizing adjustable rubberized lateral stabilizers that simply twist into place with wingnut bype screws Assembles quickly, with no tools required; It won't scratch truck paint - soft padding included to protect bike finish Extends from 54.5" to 67" without a spacer; extends from 60 5/8" to 73 1/4 " with a full-size spacer