Shimano Deore M590 CrankBottom Brackets Sets Chainring spider is not removable All 3 chainrings are steel and replaceable unless noted otherwise 9 spd compatible Hyperdrive chainrings with aluminum outer ring Item Specifications BB Thread Type English Spindle Interface Type Hollowtech II Pedal Spindle 916 Bolt Pattern 4Bolt Rings 223244 CrankFD Type Mountain Triple BB Shell Width 68mm
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