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  1. #1
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    Anyone know the difference between...

    Dura Ace A-type versus B-type, specifically where chainrings are concerned?

  2. #2
    just pokin' along desertdork's Avatar
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    I believe one is designed for use with 42t inner rings, while the other is designed for 39t inner rings.

  3. #3
    Senior Member vredstein's Avatar
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    Quote Originally Posted by Wrench_Monkey View Post
    Dura Ace A-type versus B-type, specifically where chainrings are concerned?
    http://www.sheldonbrown.com/dura-ace.html#chainrings

    • Set "A" uses a 42 tooth small ring, and a corresponding "A" type 53.
    • Set "B" uses a 39 tooth small ring, and a choice of "B" type 52 or "B" type 53
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  4. #4
    coprolite fietsbob's Avatar
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    yea shift pins and gates are in different spots, depending on the inner chain ring.

  5. #5
    DOS
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    I have mixed A Type big ring with B type small ring with no discernible negative consequence.
    My Opinions > My Knowledge

  6. #6
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    I agree with all the posters above. The A and B designations refer to the chainring combinations that will provide optimal performance. But it's not like your bike will explode if you mix an "A" big ring with a "B" little ring.

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