Rotor Q-rings give you a smoother pedal action and help reduce build up of lactates at threshold.They give you assistance deadspot by reducing the effective gear, and also help you utilise the Q-moment(point of most force) by raising the effective gear.Proven in the Tour de France by 2008 winner Carlos Sastre available to purchase online from Velotech Services at great prices 130mmbcdcampagnoloinconlineqringsroadservicesvelotech By vistaedin Sport > Sport Shoppingwith servicesshoppingsportvelotech