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More safety tips here.
ura Ace FC-9000 Crankset Compact 34-11 52 teeth
Crank Arm Length: 172.5mm
New 4-arm design for same stiffness with lighter weight
Hollowtech II construction
Same bolt circle diameter for compact and traditional double chainsets means that one crankarm fits all chainring sizes
Bolt circle diameter: 110mm
Chain line: 43,5mm
Includes Hollowtech II Bottom Bracket SM-BB9000 BSA
Weight: 683g (with BB)