Malone Co-Pilot 2 Bike Expansion Module - The Co-Pilot Expansion Module allows you to increase the capacity of your existing Pilot HM2 from two bikes to four bikes. This modular design with optional expansion capability makes the Pilot HM2 and Co-Pilot combo a great choice. For cross-town transport to the trails or loaded up for a road trip, the Co-Pilot provides safe and confident transportation. Constructed of powder coated steel. The padded ratchet arms hold the bikes securely by the front wheel. Ideal for carbon framed, full suspension, and fat tire bikes. Features Two bike capacity or four bike capacity with the Pilot HM2 ; Folds up when not in use.; Folds down for rear-of vehicle access.; Secures bike with adjustable pivoting ratchet arm.; Bike to bike contact is eliminated by arm and wheel tray mounts.; Best for carbon frames, road, mountain, downhill, bmx, and fat bikes.; Securely carries 20in to 29in wheels and tires up to 5in; Semi-retracting key lock security cable.;