ENVE Composites M6 Front Wheel - 29" 15 x 110 Center-Lock BlackENVE Composites M6 Front Wheel 29" 15 x 110 Center Lock 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 an internal rim width of 32mm and