Profile Bmx Cranks On A Fixed Gear.. Help

Discussion in 'Cycling Equipment' started by Sheayo, Aug 17, 2010.

  1. Sheayo

    Sheayo New Member

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    So after doing hours of research ive come to the conclusion
    that i want to put profile bmx cranks on to my se pk ripper fixed gear frame
    I am really lost
    and need help on part specs
    I read that its possible to use these cranks
    you just need to get a euro bb
    My problem is
    I have no idea what length the spindle should be
    these are the sizes shown online
    5 5/8
    5 1/4
    6
    Any advice would help me
    and i am also confused on the fact that they have the chromoly race crank set
    and the 3 peice set
    which would be most compatible?
    Thank you..

    Here is the website for the cranksets
    http://profileracing.com/estore2/index.php?catid=1
    if anyone knows the sizes & specs id need
    please inform me
     
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  2. alienator

    alienator Well-Known Member

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    Email them and tell them the inside diameter of your bottom bracket shell, the width of you BB shell, and the thread pitch in the shell. They should then be able to put a packaged together for you to suit your needs.
     
  3. alfeng

    alfeng Well-Known Member

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    Well, inquiring minds want to know -- Why are you changing the cranks on an almost new bike?

    What happened to the original crankset?

    Most importantly, do you realize that you can use almost ANY Road-or-MTB crankset and that it doesn't have to be a BMX crank?

    FYI. "Euro" BB == English Threaded BB in non-BMX jargon



    FWIW. The spindle length is based on the hypothetical "ideal" chainline ...
    • A BMX rear hub is 110mm
    • A "Track"/Fixie rear hub is 120mm
    • A ROAD rear hub is 130mm
    • A MTB rear hub is 135mm
    Presumably, you would NOT want either the longest or shortest spindle ... and, that with a rear wheel's OLD spacing of 120mm you would want the intermediate length spindle ...

    BUT, again, why are you changing the crank?

    Were you planning on getting the Titanium (?) crankset to lighten the bike OR is it just conspicuous consumption for when you are at the coffee shop?
     
  4. Sheayo

    Sheayo New Member

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    I bought the pk ripper frame
    as a frame itself
    the cranks i have on my current bike (felt curbside)
    are the fsa rpm vero's
    ive been riding on them for a while now
    they have definetly have seen some wear & tear plus theyre falling apart
    I thought that i would invest some real money into cranks
    seeing that i will be using them for a while and they are a vital part of a bike
    i chose the profile cranks because of the small chainring sizes avaliable
    and because they sell titanium spindle's
    which im interested in..
    also they do look pretty legit
     
  5. Sheayo

    Sheayo New Member

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  6. alfeng

    alfeng Well-Known Member

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    The 110BCD spider used on three-piece BMX cranks is pretty standard & available on a lot of Road cranks ...

    If you want conspicuous consumption, then you may want to look at a Campagnolo Ultra Torque crankset ... alloy or carbon fiber.
     
  7. alfeng

    alfeng Well-Known Member

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    RACEFACE cranks are probably more serious looking for/to a non-Road rider ...
     
  8. Sheayo

    Sheayo New Member

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    The campy's are nice
    but i have my mind set on the profiles
    as i know its been done before
    i just emailed the company to get theyre say on it
    il keep the site posted on what happens
     
  9. alfeng

    alfeng Well-Known Member

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    Again, "Euro BB" in BMX parlance == "English BB" to the rest of the cycling world ... which is what your frame has.

    So, any crank which uses "Euro" BB cups (but, not Spanish BBs which remain as an unknown quantity) can be used on 90% of the bikes that are rolling down the street ...

    BTW. You can check www.danscomp.com for reference on BMX components ... Dan's Comp will have a lot of BMX-related stuff (but, not everything) ... but, they won't have 32h hubs & 700c rims/tires.

    ONE THING which you may want to consider is the crank arm length ... as you may already know, not all BMX cranks are available in all lengths ...

    There are competing theories as to what length is best for a given rider AND for Fixies & Single Speeds which seems to differ from the length suggested for other riding styles ... I don't subscribe to any of those theories, but you may want to ...
     
  10. alfeng

    alfeng Well-Known Member

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    Understood.

    If my frame-of-reference was strictly BMX bikes, then a set of the CroMoly/Magnutanium Profile crank arms is the way I would probably go.
     
  11. Sheayo

    Sheayo New Member

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    Took a look at the race face atlas cranks
    Theyre really nice
    Just too expensive

    My main thought is to spend this amount of money on a crank set not meant for my type of bike
    I want the profiles due to the fact that they are available in 145mm which appeals to me in many ways
    and the titanium spindle
    ?...
     
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