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  1. #1
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    Does 1/2cm matter?

    So I started building up my 90' Miyata 914 tonight with the new-to-me group I got. I put the BB in and bolted the cranks on. I suppose ideally you'd want the same distance between each crank arm and the seat-tube. I measured and the inside of the drive-side crank arm is 1/2cm closer to the seat-tube than the other crank arm. Does that small difference really matter? I've never really measured before, so maybe they're all usually exactly the same distance or maybe 1/2cm isn't really a big deal?
    90 Miyata 914 with full Dura-Ace
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    Quote Originally Posted by scyclops View Post
    Oh yeah, sure, what if everyone thought that way? Then internet forums would merely be places where rational people exchange useful information and ideas - instead of the chaotic, emotionally-charged circuses that they are.

  2. #2
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    It wouldn't matter to me. I know some people will notice any slight variation in their bikes but I once checked all of mine and found all sorts of differences in seat height, reach, etc. I thought they were all the same.

  3. #3
    Cisalpinist Italuminium's Avatar
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    Depends on the crank, bb spindle, bb width... but in the end only the marketing departments "feel" the difference IMHO.
    Pass the Dutchie on the non-drive side.
    Everything in life is about bikes. Except bikes, bikes are about power.

  4. #4
    Senior Member Grim's Avatar
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    Some cranks are Asymmetric and the correct BB is longer on the cranks side. Was the BB original to the cranks or are you running a modern BB?
    See if Sheldon has it listed. this would be a good start but there is other info if you dig.
    http://sheldonbrown.com/bbsize.html
    You cant have a signature unless it fits in this box

  5. #5
    Must... ride... more... Phil_gretz's Avatar
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    Get A New Spindle?

    Quote Originally Posted by 3speed View Post
    Does that small difference really matter? I've never really measured before, so maybe they're all usually exactly the same distance or maybe 1/2cm isn't really a big deal?
    This will depend on how sensitive your body will be to this misalignment between your femurs and knee joint relative to your pelvis. I'm very concerned about mechanical alignment for my body, so would just pull the old spindle, and search for a new one that has the correct dimensions. That's just me. Wouldn't take much effort or cost a lot. Just replace it...

    PG

  6. #6
    Senior Member peazweag's Avatar
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    good grief
    1980 MIYATA 610

  7. #7
    rhm
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    The 5 mm would not matter to me. Phil's points above are well taken, but my body is already asymmetrical in more ways than I can measure, so I just don't worry about it.

    On the other hand, is it possible you put your spindle in backwards?

  8. #8
    Senior Member due ruote's Avatar
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    Personally I wouldn't worry about it. No one has a perfectly symmetrical body anyway. Many people, for example, have one leg longer than the other, yet we ride with the same length cranks on both sides of the bike.

  9. #9
    Senior Member Lewis_Moon's Avatar
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    Is the spindle symetrical? They're sometimes longer on the drive side. Do you have the spindle in backwards?
    A new hip and a 2005 Lemond Poprad...This will not end well.

  10. #10
    Is a real super guy. Henry III's Avatar
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    If it moves when it's pedaled then it's cool with me.

  11. #11
    Senior Member randyjawa's Avatar
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    Out of curiosity and because there is a Miyata 916 sitting not twenty feet away from me, I went and measured. Yup, about 5mm difference with the drive side crank being further away from the center line of the bicycle - measured at the spindle. My bike has, however, been fitted with a 9 Speed crank set and transmission.

    Then I measured the distance of the crank ends to the chain stays and guess what. Identical measurements.
    Learn how to find, restore and maintain vintage road bicycles at... MY "TEN SPEEDS"

  12. #12
    Senior Member due ruote's Avatar
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    Quote Originally Posted by randyjawa View Post
    Out of curiosity and because there is a Miyata 916 sitting not twenty feet away from me, I went and measured. Yup, about 5mm difference with the drive side crank being further away from the center line of the bicycle - measured at the spindle. My bike has, however, been fitted with a 9 Speed crank set and transmission.

    Then I measured the distance of the crank ends to the chain stays and guess what. Identical measurements.
    Do you mean identical to the first measurement, ie. a difference of 5mm, or identical to each other?

  13. #13
    Can'tre Member 3alarmer's Avatar
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    I've been telling women for years that size doesn't matter......just sayin'
    Quote Originally Posted by CbadRider View Post
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  14. #14
    Senior Member randyjawa's Avatar
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    Do you mean identical to the first measurement, ie. a difference of 5mm, or identical to each other?
    Sorry to confuse and good point.

    I mean that there was a difference, in measurements, from the bicycle's center-line to the spindle ends. But, when I measured the distance from the pedal ends, of the cranks, to their respective chain stays, that measurement was the same for each side.
    Learn how to find, restore and maintain vintage road bicycles at... MY "TEN SPEEDS"

  15. #15
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    If you put an assymetrical BB in the bike you will have that problem, but it will depend on the crankset. Sincerely for the type of bike you are talking about i wouldt care. You wont take it to a contest to start with, right?

  16. #16
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    Thanks, guys. I really didn't think it mattered at all. Just wanted to make sure. And as for spindle, this is actually a newer style sealed BB that came with the 9sp cranks. It's just that the spindle in the BB is slightly longer on the non-drive side. I'm not gonna worry about it at all unless I get surprised by some minor issue once I get it out on the road.
    90 Miyata 914 with full Dura-Ace
    74 Ellis-Briggs, full butted 531
    80s Cierra Professional 5000, Tange Champion 2 and Shimano 600
    2011 New Belgium Cruiser
    Fetish Cycles "Discipline" built up with DJ2 fork and Shimano XTR, LX, Avid BB7.

    Quote Originally Posted by scyclops View Post
    Oh yeah, sure, what if everyone thought that way? Then internet forums would merely be places where rational people exchange useful information and ideas - instead of the chaotic, emotionally-charged circuses that they are.

  17. #17
    )) <> (( illwafer's Avatar
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    you can drop a 2mm spacer on the drive side of the bb. that should make it only 1mm closer.

    edit: there's actually a 2.5mm spacer that should even it out:
    http://www.amazon.com/Wheels-Manufac.../dp/B001AYMP7G

  18. #18
    Gearhead old's'cool's Avatar
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    I would make sure that things like chainring clearance (i.e. with the chainstay) and chainline are in good shape before giving any thought to symmetry.
    Geoff
    "I think that I think, therefore I think that I am"

  19. #19
    Senior Member Paramount1973's Avatar
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    5mm is about 1/5 of an inch (holding up a ruler and squinting). Nah, you'll never feel that. For example, for someone with a 32" inseam, that works out to about 0.6% in length. In terms of angle, that is about 0.28 degrees.
    Last edited by Paramount1973; 05-03-12 at 08:58 PM.

  20. #20
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    Quote Originally Posted by 3alarmer View Post
    I've been telling women for years that size doesn't matter......just sayin'
    My wife calls bull****.

  21. #21
    MIKE is my name! puchfinnland's Avatar
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    in this case I bet that if you were given the bike to ride and you did not measure it you most likely would have never known.

    but as the boys are joking about I would agree that I wish I had 5mm more, and normally it is on the left side!

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