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Old 07-31-08, 09:14 AM   #1
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bcd question

here's the deal: i have these cranks. sugino gt's. they're five-bolt road cranks for two chainrings. i like them rather a lot.

however, i've now gone a stripped some teeth down on my chainring and would like to get a replacement. the question is: what's the bcd? it's not written anywhere on the cranks, my measurement ability is insufficiently accurate to come up with the right number and sheldon brown doesn't seem to have that info squirrled away anywhere.

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Old 07-31-08, 09:20 AM   #2
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A lot of the Suginos were 110mm, but I don't know the GT specifically. The first entry on this page will help you figure it out:
Slow Ride Cyclists of NEPA

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Old 07-31-08, 11:18 AM   #3
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You can calculate/look up your BCD with a ruler and the info posted there. Make sure to go from the center of one bolt hole to the center of the next. Sheldon does explain this measurement, and he also quotes the formula for calculating the BCD from it.

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