The bw bike box features a tough abs shell wheel bags and an aluminium frame for robust protection wherever you travel the bike box is made from strike proof abs moulded around an aluminium frame the internal walls have thick foam padding and 4 quick release straps to hold you bike frame and wheels in place the shell is double thickness around the 4 wheels on the bottom corners for added strength the wheels are free running with reinforced axles there are 4 locks which are flush fitting a