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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 12-26-05, 06:54 PM   #1
BDixon
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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
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Old 12-26-05, 07:04 PM   #2
PhattTyre
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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.
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Old 12-27-05, 04:43 AM   #3
LóFarkas
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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.
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Old 12-28-05, 12:21 PM   #4
BDixon
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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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