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  1. #1
    left treadle forward danish's Avatar
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    <strikethrough>BFSSFG IRO</strikethrough>, 197X Raleigh Record Ltd conversion, Java SS
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    IF there's an article that explains this I'd be more than happy to read it, I'm not looking for a hand holding (although if somebody wants to hold hands sometime.. i do get kinda lonely..)

    Err, I need shorter cranks but I like me ratio. How does one measure the spider to make sure new cranks fit current chainring?

    Thanks.

  2. #2
    blah onetwentyeight's Avatar
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    i know thats a chainring but the holes should be in the same place, obviously.

    edit: then go here to get the bcd.
    http://www.sheldonbrown.com/gloss_bo-z.html

    or do what dommer says.
    Last edited by onetwentyeight; 02-17-06 at 10:44 AM.

  3. #3
    aka mattio queerpunk's Avatar
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    you measure the "bolt circle diameter." sheldonbrown.com has info on what bolt-to-bolt distances correlate to what bolt circle diameters.
    the hipster myth.

    i practice vagabondery.

  4. #4
    Banned. dommer's Avatar
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    Quote Originally Posted by onetwentyeight


    i know thats a chainring but the holes should be in the same place, obviously.

    to finish this off...

    Measuring BCD: This 110 mm BCD ring measures 64.7 mm center-to-center.

    Multiplying this dimension by 1.7 will give you the actual BCD for a 5 bolt chainring.

    Use 1.4 for 4 bolt chainrings

  5. #5
    Iguana Subsystem dolface's Avatar
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