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  1. #1
    Senior Member tkehler's Avatar
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    Surly Crosscheck double chainring question

    A friend of mine is thinking about buying a Crosscheck, which he wants to use for commuting and light touring and fitness riding. (Good choice methinks!)

    But the bike's got a double up front. How tricky is it to add a third (small) chainring? Would he need a new crankset?

    Thanks for your help!

  2. #2
    Senior Member
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    If the cranks are only doubles i would think that he will have to get a triple crankset.
    derailleur? I hardly know her
    http://a2bikegeek.wordpress.com/

  3. #3
    Team Beer Cynikal's Avatar
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    Generally a new crank and BB along with a new rear derailer are needed for the conversion. This is assuming that the left shifter is set up for it. You may want to look at a cassette with a wider range (may also need a new RD) or a compact crank (110 BCD).
    I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC

  4. #4
    Senior Member tkehler's Avatar
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    The shifters are bar end shifters, and I believe that they are set up to work with triple and double chainrings. (But I'm not positive.)

    So, I think that while he'll need a new crank, he will get by with the same bar end shifters.

    As for the cassette, I have no idea what is on the bike he's proposing to buy...

    Thanks very much!

  5. #5
    Senior Member c_m_shooter's Avatar
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    The stock crank is a triple without the inside ring. He will just need a wider bottom bracket and the appropriate small chainring. The stock rings are 36/48, so the gearing is lower than a regular road bike to begin with. The rear derailer will work fine with an 11-32 mountain cassette if he chooses to go that route instead. I have two wheelsets for mine, one with an 11-32 cassette and 45mm knobbies for mountain bike trails and one with the stock cassette and 28mm slicks for road rides. I can swap between the two without adjusting a thing.
    Last edited by c_m_shooter; 08-27-08 at 01:34 AM.
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  6. #6
    Senior Member tkehler's Avatar
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    Quote Originally Posted by c_m_shooter View Post
    The stock crank is a triple without the inside ring. He will just need a wider bottom bracket and the appropriate small chainring. The stock rings are 36/48, so the gearing is lower than a regular road bike to begin with. The rear derailer will work fine with an 11-32 mountain cassette if he chooses to go that route instead. I have two wheelsets for mine, one with an 11-32 cassette and 45mm knobbies for mountain bike trails and one with the stock cassette and 28mm slicks for road rides. I can swap between the two without adjusting a thing.
    This post provided me with great help, I appreciate it.

  7. #7
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    In addition to the other stuff mentioned, he'll also need a new front derailleur for the triple.

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