With SRAM's Torpedo Single Speed hub, you can easily switch between riding free or fixed! Seven rotations with a screwdriver will switch the Torpedo from a fixed gear to work your legs, to a freewheel to give your legs a rest and keep rolling. A "fixed gear“ means riding without a freewheel, which means no coasting. As long as the rear wheel is moving, the chain, crank and rider’s legs have to keep moving. Legs and bike work together in harmony. Riding "freewheel" lets you coast, corner like a cheetah, and zoom down hills. The choice is yours!