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  1. #1
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    So my conversion didn't go over so well =/

    I converted a Jamis Aurora cyclocross the other day using some parts I had laying around, and it went pretty piss poor. I was hoping that 40/16 would be a magic gear, given that is what I had on hand and it has vertical dropouts, but I didn't have such luck. The chain can be knocked off by tilting the bike over rapidly. I believe a half-link will work, so I am going to give that a shot. If that doesn't work going up a tooth in the front should put it where it needs to be, then once the chain stretches I would go to a 17 in the rear. In addition the 175 crank arms + toe clips give quite a bit of overlap for the front wheel. It's a shame, the bike rides like a dream otherwise. I might put the Sora group back on the Jamis and sell it, and put the SS stuff on a Pista frame that is too big for me and sell that, then pick up a group buy Iro frame and build it up. Decisions decisions...

  2. #2
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    yea, guessing on magic gear ratios usually doesn't turn out that great....

  3. #3
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    Oh well, I tried and learned my lesson. My big decision is how much money I want to put into this versus something else.

  4. #4
    perspective distorts killsurfcity's Avatar
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    how far off were you? could a half-link in the chain sort that out?
    the sound of life

    "I have nothing to say and I am saying it and that is poetry." - John Cage

  5. #5
    Honking drivers see you noriel's Avatar
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    You're better off starting on an easier frame, like a track frame or a cyclocross fram with track ends or horizontal dropouts. Leave the Jamis alone. I'd rather have two good fixed gear bikes, instead of 4 so-so builds that may never really be finished.
    Noriel
    ----------------
    Geared-->SS-->Fixie.
    Somewhere between I got a dual slalom and mod trials bike.
    I think I'm through with derailleurs.
    I guess uni's are my next step.

  6. #6
    Bow$$ dustinlikewhat's Avatar
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    wait was this fixed or single speed? if single speed just get a tensioner.

  7. #7
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    Quote Originally Posted by dustinlikewhat
    wait was this fixed or single speed? if single speed just get a tensioner.
    I would like to run both, and it def isn't worth $150 for an Eno hub

  8. #8
    Bow$$ dustinlikewhat's Avatar
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    if it's a great fitting/riding frame, it is. or just slap the gears back on it and save up for a frame with track ends.

  9. #9
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    Bad idea on the chain stretch. Although it compensates for the distance between front chainring and rear sprocket, the distance between teeth on a gear is constant. Riding a stretched chain will wear out your teeth really fast.

    Quote Originally Posted by anomaly
    If that doesn't work going up a tooth in the front should put it where it needs to be, then once the chain stretches I would go to a 17 in the rear. .

  10. #10
    MFA jjvw's Avatar
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    Waiting for your chain to stretch to move up a gear is a bad idea.

  11. #11
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    Good to know, then where exactly does a chain 'stretch' if the distances remain constant?

  12. #12
    Mmmmm potatoes idcruiserman's Avatar
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    Pin wear.
    Idaho

  13. #13
    oldsprinter oldsprinter's Avatar
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    Get a 1/4 link for now

  14. #14
    Honking drivers see you noriel's Avatar
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    I had an ss mtb conversion and the chain tension was so tight that it wore out the drive-side races on my rear hub. It was a bike that I had a "magic-gear" figured out.
    Noriel
    ----------------
    Geared-->SS-->Fixie.
    Somewhere between I got a dual slalom and mod trials bike.
    I think I'm through with derailleurs.
    I guess uni's are my next step.

  15. #15
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    Quote Originally Posted by idcruiserman
    Pin wear.
    roller/bushing wear

  16. #16
    domestique squeakywheel's Avatar
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    Adding a tooth will move the rear axle forward 1/8 inch.

    Adding a half link will move the rear axle backwards 1/4 inch.

    Adding a full link will move the rear axle backwards 1/2 inch.

    Measure your error with what you have now and then figure out which combination of adding / removing any of these three will put the axle in the dropouts.

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