The Bolinas Ridge family of mountain bikes are designed for the recreational mountain biker looking to explore their local singletrack or dirt paths. Utilizing our lightweight, Series 1 aluminum alloy frames, 100mm travel suspension forks, and reliable Shimano drivetrains, these bikes are capable of tackling real trails and pushing your own boundaries. Size-specific 27.5" or 29" wheels, disc brakes, and 2.25" MTB tires mean comfort, traction, and control through any rough terrain. Get outside and explore with the Marin Bolinas Ridge. - Series 1 6061 Aluminum frame - SR Suntour XCE Disc, 100mm travel fork - Shimano Tourney 3x7-speed drivetrain - Power CX7 mechanical disc brakes