The Scorpion is compatible with 13, 18 and 20mm hollow crank spindles on either side of the bike. The design elevates the rear wheel and lends itself to lite bike maintenance, like chain lubrication and frame cleaning.Awesome bike storage for garages, sheds, apartments, events or retail bike displaysVersatile design allows for bike parking with 13, 18, or 20mm open cranksSystem fits road bike, cyclocross bike, mountain bike, and electric bike crank designsDesign elevates the rear wheel and stabilizes the bikeConstruction prevents contact with painted surfaces or delicate componentsInnovative design folds to a compact unit when not in useAwesome bike parking solution for even the heaviest of bikes (50lbs / 22.7kg max load)Not compatible with Campagnolo Ultra Torque cranks with internal fixing bolt Feedback Sports Scorpion Display Stand Racks, Display/Storage UPC: 817966011083