Sheldon Brown has a good description too (and if you've not discovered this fellows website, its got lots of great stuff for us newbies):
http://www.sheldonbrown.com/
rich pinder van nuys, ca
PaulieFlt@aol.com wrote:
>Okay gang,
>
>I have these chainrings up on eBay and it's apparent I need to know how to
>measure BCD. Can somebody explain that to me?
>
>Many thanks!
>
>Have tape measurer, will travel,
>Paulie Davis
>Los Angeles