Patent ID: 8371974

Claim:
A chain tension structure comprising: a transmission including a sprocket wheel mounted on a crankshaft operatively connected to a drive sprocket wheel, the drive sprocket wheel being located forwardly with respect to the sprocket wheel; a chain wound around the drive sprocket wheel and a driven sprocket wheel mounted on a rear wheel side; and a tension roller for imparting tension to the chain, the tension roller being mounted on a rotary shaft inserted into an aperture which is opened in a bracket projecting rearwardly from a rear surface of a downwardly sloping rear frame of the vehicle body frame, and wherein the rotary shaft of the tension roller is offset to the rear surface of the downwardly sloping rear frame, and the sprocket wheel mounted on the crankshaft and the drive sprocket wheel are offset with respect to a front surface of the downwardly sloping rear frame.