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All Di2 components on the bicycle require the same firmware version
It’s a key component for comfort
Designed for racers and built for speed
Ring Position/Type: Single
Wheels Manufacturing Italian Bottom Bracket - 30mm Spindle - ABEC 3 - Black Shifters All Di2 components on theWheels Manufacturing Italian threaded bottom brackets feature machined aluminum cups, ABEC 3 sealed bearing, and full serviceability. For use with 30mm diameter cranks with a spindle length of at least 106mm when used in a 70mm wide BB shell Overall spindle length measurement is with all spacers and adjusters removed from the spindle (Measurement is taken from the inside face of the crank arm to the very end of the spindle) Will not work with standard