quarq-dfour-powermeter-crank-spider-assembly-8-bolt-110mm-shimano-asymmetric-bcd
quarq-dfour-powermeter-crank-spider-assembly-8-bolt-110mm-shimano-asymmetric-bcd, Quarq's power meter technology is reliable, accurate and easy to use. Now available as a spider by itself as an easy upgrade for existing cranks. The Dfour and DZero models offer improved data transfer and frame fit compatibility.