Shimano FC-R8100-9 Ultegra 12-Speed Hollowtech 2 172.55mm (50-34T) Front Chainwheel Crankset

• Outer ring material: Aluminum/ CFRP
• Crank axle material: Steel
• Average weight:  -,758g,769g
• Threaded BB shell width: 68/70
• Crank arm finish: Anodized
• Compatible BB type: Outboard
• Cranks axle finish: Plated
• Gear arms: 4
• Compatible chain: CN-M8100
• Inner ring material: Aluminum
• Inner ring finish: Anodized
• Crank arm length: 160,165,170,172.5,175
• Chain ring combination: No Chainring,50-34,52-36
• Outer ring finish: Anodized
• Crank arm material: Aluminum