The GMC Topkick Mountain Bike features a full-suspension, strong aluminum frame that utilizes a floating beam suspension design that is mated to a suspension fork. The Topkick’s features 21 Speed Shimano Shifters and rear derailleur. The drivetrain finishes up with a strong aluminum wheelset featuring V-shape rim profile and high-flange alloy hubs. Stopping is handled by disk brakes on the front and rear. True to it’s GMC roots, this bicycle is rugged, good looking, and built for the long haul.