ENVE Composites M6 Rear Wheel - 27.5" 12 x 148 Center-Lock Micro Spline Innerdrive 80pt BLKENVE Composites M5 Pro Rear Wheel 29" 12 x 148 Center Lock Micro Spline Innerdrive 80pt Black. The all new M6 is ENVEs flagship every day any trail wheel developed for all the bikes riders and trails between cross country and gravity racing disciplines. Like all new M Series wheels the M6s rims feature unique shapes and constructions front and back. To accommodate the modern trail riders preference for 2. 4 2. 5 wide tires the M6s front rim features