Avon Trailrider 170/60ZR17 Rear Tyre (72W Rating)Using technology from the other rubber in its range, the TrailRider uses an Advanced Variable Belt construction to control sidewall flex. The tyres are silica rich, promised to enhance wet grip, while the rear is a multi compound construction (softer on the edge, harder on the centre) to extend the tyres life when riding in a straight line. Sipes in the radial TrailRiders are small cuts that create extra grooves, improving water displacement and