Shimano m617 deore chainset 10 speedshimanos m617 deore chainset provides top level performance and technologies at a great value for money price its two piece hollowtech ii design not only makes installation simple it also ensures a rigid and smooth operation that lasts sg x dyna sys chainrings give you quick and smooth efficient shifting even under load helping you to blast down your local trails faster than ever features materialaluminium crank arm and large chainring steel in