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Thread: Campagnolo hidden chainring bolt question

  1. #1
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    Default Campagnolo hidden chainring bolt question

    Any know the OD of the 5th/hidden chainring bolt in the 2011-2014 FC-SR200 chainring bolt set?

    And are the bolt holes sizes in the pre-2011 crankarms the same as those in the 2011-14 arms?

    Thanks! Looking at some questions of Rotor Q-Ring compatibility.
     

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    Default Re: Campagnolo hidden chainring bolt question

    I dunno the years involved but the 5th hidden bolt and spacer had different shank diameters, larger for the earlier 10-speed rings and smaller for the newer 11-speed stuff. The earlier rings used allen-head chainring bolts and separate nuts, the newer rings used torx-head bolts and a threaded inner ring. The older 5th bolt did not fit the new rings. I turned down an old triple inner bolt's head to fit, and shortened it a hair. Problem sol-ved.

    Are you looking for the shank OD or the head OD? If it's the former, it's the same thread and shank OD as a standard chainring bolt.

    TH
     

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    Default Re: Campagnolo hidden chainring bolt question

    The Campagnolo chainring bolts are a small jungle (er, like Shimano but to a greater extent) and differ for many points:
    -length of the straight shank
    -OD of the above
    -length of the threaded part (their thread ø and pitch is actually the same as other chainring bolts)
    -bevel of the bolt head

    Now, if you are not going to use Campag chainring you are going into a minefield: you'll have to just try to see what works and allows you to tighten the bolts to those 6-7Nm without "bottoming-out".
    Last thing you want to do is to strip the crank thread because of an odd chainring.
    As a rule of thumb, the Campag chainring bolts would change mainly if the cranks are carbon or not. Past this, it's all about the hole in the chainring and the bevel this has (single or double).
    Andrea "Gattonero" Cattolico, head mechanic @Condor Cycles London


    "Caron, non ti crucciare:
    vuolsi così colà dove si puote
    ciò che si vuole, e più non dimandare"

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    Default Re: Campagnolo hidden chainring bolt question

    thanks for all the replies; I've been out of pocket on family vacation. Talked with the US Rotor guys (very helpful). I had been running an earlier version of Q-rings and the two-piece Campag-compatible bolts worked. When Campy went with the thread-in inner chainring Rotor eventually changed their specs to match, so they recommended the Campy OEM SR-200 bolt set. My set was with our held mail today so tomorrow I'll see if I'm good to go.
     

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