singletrack machine. Anyone who never looks for the easiest line downhill and sees every trail as a challenge has found a friend in the DOC SPEED. 29er Trailbike with sufficient tire clearance for 2.6 tires on 30 mm wide carbon wheels. Combined with a 150 suspension fork, nothing stands in the way of having fun downhill. How do DOC-SPEED bikers greet each other? IS MOBILE!