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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 02-17-06, 11:35 AM   #1
danish
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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.
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Old 02-17-06, 11:38 AM   #2
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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 11:44 AM.
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Old 02-17-06, 11:40 AM   #3
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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.
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Old 02-17-06, 11:43 AM   #4
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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
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Old 02-17-06, 11:43 AM   #5
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http://www.sheldonbrown.com/gloss_bo-z.html
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