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Change Dura Ace 9100 53T/39T to 50T/34T chain rings?

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Change Dura Ace 9100 53T/39T to 50T/34T chain rings?

Old 07-19-19, 10:59 PM
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Change Dura Ace 9100 53T/39T to 50T/34T chain rings?


I have a Dura Ace 9100 crankset with 53t/39t chain rings. I want to change to 50t/34t chain rings. I would like to know if the cranks will be compatible with smaller rings because I got conflicting info. I called one LBS and was told the rings would be compatible, however, they don't have them in stock. A second LBS said the rings are not compatible, and I need to buy a new compact crankset.

Thanks for your help...
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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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Old 07-20-19, 01:40 AM
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The first LBS is correct.

You can buy the 9100 chainrings, remove the old and bolt the new ones on yourself.

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