Mavic's Ellipse is the perfect rear wheel to dominate at the track! Mavic's aero 6106-aluminum rim and bladed, straight-pull stainless-steel spokes are stiff for ultra-responsive sprinting and aerodynamic for maximum speed. Plus, the hub is threaded on both sides for mounting two different cogs. And, this zippy wheel features Mavic's smooth-rolling QRM+ sealed-bearing hub for years of trouble-free service.