Thread: Change Dura Ace 9100 53T/39T to 50T/34T chain rings?
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Old 07-20-19, 01:04 AM
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All the shiumano dura ace road cranks went to the same BCD a WHILE ago so that you didn't need to buy a different crank to go from say 50/34 to 53/39. Pretty sure that's still the case.

110mm bcd for all the r9100 rings.
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