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  1. #1
    Senior Member
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    Surly Karate Monkey chainring/frame spacing

    I have a Surly Karate Monkey running a 42 tooth single speed crank. The bike was set up by my LBS (Boulevard Bikes in Chicago--great shop). There is just about zero space between the chain ring and the frame. I could fit a credit card in there but not much else. Is this something to be concerned about? I'm afraid that one little nudge and the teeth will be smacking into the frame. I know many others have run single speed Karate Monkeys w/a 42 tooth rings, so I'm wondering what's wrong with my setup---is there something I can do to adjust the crank/chain ring to move it out w/out screwing up the chain line? Isn't the frame designed to handle larger chain rings? Would going larger exacerbate this problem?

    Thanks in advance for any insight or advice.

  2. #2
    cycles per second Gonzo Bob's Avatar
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    It seems like you might want to use a slightly longer bottom bracket axle. How's your chain line?

  3. #3
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    Photos would help, I know. Unfortunately I don't have any right now. Chainline is perfect (I think)--it runs straight from the crank to the rear cog. That's why I thought having a longer bottom bracket would screw it up. I just don't get bike geometry

  4. #4
    Listen to me powers2b's Avatar
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    Quote Originally Posted by russian fighter View Post
    I have a Surly Karate Monkey running a 42 tooth single speed crank. The bike was set up by my LBS (Boulevard Bikes in Chicago--great shop). There is just about zero space between the chain ring and the frame. I could fit a credit card in there but not much else. Is this something to be concerned about? I'm afraid that one little nudge and the teeth will be smacking into the frame. I know many others have run single speed Karate Monkeys w/a 42 tooth rings, so I'm wondering what's wrong with my setup---is there something I can do to adjust the crank/chain ring to move it out w/out screwing up the chain line? Isn't the frame designed to handle larger chain rings? Would going larger exacerbate this problem?

    Thanks in advance for any insight or advice.
    It must be a good shop.
    I aspire to get this type of fit on all my builds.
    Quote Originally Posted by SBFixed View Post
    You're a dick, if your bike gets stolen I hope that you don't get a thread.

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