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  1. #1
    Commuting Fool
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    Can you use a 103mm on any squarte taper crankset?

    I'm interested in this fixed gear crankset below:

    They recommend Shimano style(?) square taper 110mm spindle bb, even though the chainring is mounted on the outside of the spider Seems kind of wide, maybe??

    I want a 42mm chainline. Would a 103mm work, or would I have to go 107mm or their suggested 110mm?
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  2. #2
    Low car diet JiveTurkey's Avatar
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    If it's a true fixed gear/single-speed/track crank, there's only one place to mount the chainring (on the "outside").

    May want to look at this thread: Origin-8 track crank spindle length MISPRINT

    Harris Cyclery lists 103mm BB for 42mm chainline: http://harriscyclery.net/itemdetails.cfm?ID=2672
    Edit: So does the Origin-8 site: http://www.origin-8.com/
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  3. #3
    Commuting Fool
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    Quote Originally Posted by JiveTurkey View Post
    If it's a true fixed gear/single-speed/track crank, there's only one place to mount the chainring (on the "outside").

    May want to look at this thread: Origin-8 track crank spindle length MISPRINT

    Harris Cyclery lists 103mm BB for 42mm chainline: http://harriscyclery.net/itemdetails.cfm?ID=2672
    Edit: So does the Origin-8 site: http://www.origin-8.com/

    Thanks. Didn't even know what brand this was?? I just want to experiment with a 160mm crank (I'm 6'2"!)
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  4. #4
    Your mom
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    Yeah, per the above thread, Origin 8's 103 seems to be the right measurement. But you never know. I solved my problem by redishing my rear wheel. No biggee. 6'2" with a 160 is pretty short.

  5. #5
    Senior Member Sincitycycler's Avatar
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    Quote Originally Posted by tellyho View Post
    Yeah, per the above thread, Origin 8's 103 seems to be the right measurement. But you never know. I solved my problem by redishing my rear wheel. No biggee. 6'2" with a 160 is pretty short.
    36 " inseam. 180mm on my roadie, 175mm on fixed currently. Mashing a bit on a 53x17 (81g.i.). RPM's rarely above 85 on the flats

    I want to go shorter cranks to work on my spin on the fixeie. Maybe around 100 rpm on a 46x17 with the 160s?
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  6. #6
    Your mom
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    Why not gear down? It's a hell of a lot cheaper to buy a new chainring than new cranks? Not to mention easier to replace.

  7. #7
    Senior Member Bill Kapaun's Avatar
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    Quote Originally Posted by Sincitycycler View Post
    36 " inseam. 180mm on my roadie, 175mm on fixed currently. Mashing a bit on a 53x17 (81g.i.). RPM's rarely above 85 on the flats

    I want to go shorter cranks to work on my spin on the fixeie. Maybe around 100 rpm on a 46x17 with the 160s?
    I have a different situation, being bad knees. Going from 175 to 170 increases my cadence 20%.
    I didn't have enough range of motion in my knees with the 175'.
    I installed 160's to give that a try, and I'm POSITIVE I'd be better off with 165's.
    I'm 6' with about a 30-31 inseam.
    You might look at my post here about crank length- Read the first and then skip to the end, and you can see my results from 175> 170> 160.
    Are Your Cranks Too Long?

    IF you have a sq taper BB, you might try these as a low cost "test" for 160's-
    http://www.nashbar.com/profile.cfm?sku=20985.

  8. #8
    cab horn
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    You're pedalling a smaller circle with smaller length crankarms, so yes, it does make a difference rather than just gearing down.

    No matter what gear you choose, your crank length will stay the same.

    103 bb for 42 mm chainline cranks 4TL. It means you won't be able to find a shorter BB unless you go real expensive to lower the Q-factor, if you are concerned about that at all.
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  9. #9
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    I'll let you know

    I just purchased this same setup, only Harris was out of the silver version, so I got black.

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