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Old 03-10-11, 10:58 AM   #1
Wrench_Monkey
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Anyone know the difference between...

Dura Ace A-type versus B-type, specifically where chainrings are concerned?
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Old 03-10-11, 11:20 AM   #2
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I believe one is designed for use with 42t inner rings, while the other is designed for 39t inner rings.
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Old 03-10-11, 11:00 PM   #3
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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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Old 03-11-11, 02:08 AM   #4
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yea shift pins and gates are in different spots, depending on the inner chain ring.
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Old 03-11-11, 07:31 PM   #5
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I have mixed A Type big ring with B type small ring with no discernible negative consequence.
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Old 03-11-11, 08:49 PM   #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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