ENVE Composites M6 Rim - 29" Disc Black 28H RearENVE Composites M6 Rim 29" Disc Black 28H Rear. The all new M6 are ENVEs flagship every day any trail rims developed for all the bikes riders and trails between cross country and gravity racing disciplines. Like all new M Series rims the M6 features 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 the rear is 29mm. The