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  1. #1
    Junior Member
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    Road cranks on mtb

    I had nothing going on this past week so I dug out my old Diamondback Ascent mtb from when I was a kid. The bike is probably 17 years old and it's beat bad lol. I've decided instead of replacing the derailers and shifters(due to some wrecks the front shifter busted and the rear derailer bent) I'd get rid of them and make it a single speed.

    I've been searching all day and haven't found an answer so I'm gonna ask. Is it possible to run the older road crank arms with my existing BB? I've got to replace the rings on this bike and I just like the cleaner lines of the road crank arms.


    Thanks

  2. #2
    Senior Member
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    Nov 2004
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    Portland, OR
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    07 Fisher Paragon, 00' Lemond Buenos Aries, Specialized Langster, Schwinn World Sport SS townie, 99 SS-Works single speed conversion, early 90s Raleigh roadie rain bike, 07 Fisher Rig, Trek 520, and a home-modified chopper
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    Just try it. You'll know pretty quick if it's going to work or not if you try to put it on. It'll either hit the frame or not.

  3. #3
    LF for the accentdeprived
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    If both cranks are either japanese or italian, give it a shot. Don't put a Campy crank on a made-for-Shimano BB, though. Different taper on the BB spindle.
    Quote Originally Posted by dutret
    Do you deny that you are clueless or do you just think that "moron" didn't need to be tacked on there?
    Bike on flickr and on FGG

  4. #4
    Junior Member
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    Another couple questions(maybe even dumb ones at that lol).

    Is there anything I would need to be aware of(other than BB size & length) if I decided to switch out the whole BB/crankset from what I have? I have the older square taper but almost everything now seems to be ISIS. I don't care about having top of the line stuff on a beater but having to scrounge around for used parts isn't exactly fun in my book.

    I can use a narrower(or wider) BB to help adjust my chain line without screwing anything up(assuming nothing rubs), correct?

    Do the SS specific cranksets move the chainring in so that your sprocket isn't out so far? If not what purpose do they actually serve? Is it just cosmetic?

    It seems like you'd want the chainring as close as possible to the frame so the sprocket would be closer to the body of the hub instead of out near the end of the axle. I'm using an old Shimano 7spd hub with just a single sprocket and pvc to space it properly for a straight chainline. With my current crankset(have no idea what they are but the outer chain ring bolts to the middle ring not the crank arm spider) using the middle ring my sprocket is way out by the frame to get a straight chainline.

    After typing that last bit up I had a thought, SS or fixed hubs must be wider than a cassette hub.

    Thanks,
    Brad

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