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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 02-26-06, 06:19 PM   #1
highpants
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how to measure bolt circle on chain ring?

i bought a campy chainring at the swap meet today here in minneapolis, but didn't buy cranks because i couldn't find any 165s. now i've got this chain ring and i'm sleuthing around on the internet, but have no idea what size the bolt circle is or which cranks are going to be compatible with it. if worse come to worse i can bring it into the shop and see what they have that might fit it, and hope that someone says, "oh, that's clearly the blah blah blah", but i thought i'd check here first.
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Old 02-26-06, 06:23 PM   #2
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Multiply the number by 1.7 and you have your BCD!
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Old 02-26-06, 06:26 PM   #3
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thanks, i love bike forums.
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Old 02-26-06, 06:28 PM   #4
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i get 136 when i follow that formula, but i'm not sure if that makes any sense.
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Old 02-26-06, 06:30 PM   #5
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Quote:
Originally Posted by highpants
i get 136 when i follow that formula, but i'm not sure if that makes any sense.
they're 135's - campy standard for road rings.
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Old 02-26-06, 06:34 PM   #6
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that does make sense, as there were some very low priced 170mm chorus cranks that i probably should have bought for $65. i was worried about my short wife and the low BB on her bike. guess i blew that.
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Old 02-27-06, 08:01 PM   #7
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135mm indeed. you can also find a nice look up table for BCD/ hole to hole measurement on the branford bike website.

note: my mentioning of the site is for info and reference material, not as an indorsement of their products.
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Old 02-27-06, 08:07 PM   #8
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Here's Sheldon Brown's page with a lot more information:Sheldon Brown's Chainring page
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