Goes without saying Shimano has stuck to the alloy crank with hollow chainrings and 24mm steel spindle format that works so well.
OUTER RING MATERIAL Aluminum/ CFRP
CRANK AXLE MATERIAL Steel
AVERAGE WEIGHT 700g,711g
THREADED BB SHELL WIDTH 68/70
CRANK ARM FINISH Anodized
COMPATIBLE BB TYPE Outboard
CRANK AXLE FINISH Plated
GEAR ARMS 4
COMPATIBLE CHAIN CN-M8100
SERIES Ultegra
INNER RING MATERIAL Aluminum
GENERATION R8100
INNER RING FINISH Anodized
CRANK ARM LENGTH 160,165,170,172.5,175
CHAIN RING COMBINATION 50-34,52-36
OUTER RING FINISH Anodized
CRANK ARM MATERIAL Aluminum






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