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  1. #1
    Retro Grouch onespeedbiker's Avatar
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    Daytona 110mm bottom bracket

    I have a Daytona/ Centaur 10 speed gruppo on my bike. I just bought a Bottom Bracket on ebay that comes in a Daytona box with a 110mm spindle. The 10 speed ISO ST BB AC-H and AC-S are 111mm as is the Centaur BB. I checked the Campy spare part catalog and there is no mention of a "Daytona" bottom bracket, 9 or 10 speed, just the AC-S/H. Does anyone know anything about this BB? I'm not concerned about the mm difference, just curious where it fits in.

  2. #2
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    AC-H was the BB sold with Daytona, (renamed Centaur) groups in 2000 and the next few years. The 1mm difference form 110 to 111 is meaningless. The AC-S BB sold with Mirage groups was the same basic cartridge, but with a heavier spindle and cups. I suspect that the H & S stood for hollow and solid, but that's just an educated guess. Either will work for your crankset, the only difference being that the AC-S will keep your bike from flying off in a tornado.
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  3. #3
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    Quote Originally Posted by FBinNY View Post
    I suspect that the H & S stood for hollow and solid, but that's just an educated guess.
    correct.

    AC-S, AC-H, and centuar bottom brackets are all 111mm symmetrical and work fine with your cranks. the 110mm listing was an error.

    chorus and record 111mm bottom brackets are asymmetrical and are for chorus/record triples.

  4. #4
    Retro Grouch onespeedbiker's Avatar
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    Either will work for your crankset, the only difference being that the AC-S will keep your bike from flying off in a tornado.
    I figured as much; much thanks. I have the anti-tornado version installed and $35 (ship incl) seemed a good price for an NOS Campy BB.

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