Bicycle Mechanics - "bcd" term in chainring
Bikeforums.net is a forum about nothing but bikes. Our community can help you find information about hard-to-find and localized information like bicycle tours, specialties like where in your area to have your recumbent bike serviced, or what are the best bicycle tires and seats for the activities you use your bike for.
07-18-07, 07:10 PM
what does the term "bcd" refer to when talking about chainrings?
07-18-07, 07:14 PM
Bolt Center Diameter. Literally, if you were to draw a circle through the center of the chainring bolts, the diameter of that circle is the measure referred to. Usually specific to a manufacturer. Easier to research what goes with your crank than to try and measure yourself.
07-18-07, 07:19 PM
Sheldon has a nice table for various old and new BCD standards for different manufacturers HERE (http://www.sheldonbrown.com/gloss_bo-z.html).
07-18-07, 07:30 PM
Four 4-bolt chainrings the BCD is easy to measure, just measure the distance across two opposing bolts. For 5-bolt cranks it's not so straight forward so the usual method is to measure the distance between two adjacent bolts and look up a conversion chart such as Sheldon Brown's.
07-18-07, 08:02 PM
ok-thanks for the info
Powered by vBulletin® Version 4.1.12 Copyright © 2013 vBulletin Solutions, Inc. All rights reserved.