ULTEGRA Crankset FC-R8100-P SM-BBR60 • Chainring teeth combinations: 50-34T/52-36T • Bolt circle diameter: 110 mm ITEM SHIMANO DESCRIPTION NO. CODE NO. Y0PW98010 Left hand crank arm unit 160 mm Y0PW98020 Left hand crank arm unit 165 mm 1 Y0PW98030 Left hand crank arm unit...