Folks,
After 50 years of riding nothing but 3-speed Sturmey-Archers,
I have just acquired my first MTB, a Schwinn Sierra MOS with a
Shimano Biopace-SG chainset (ca.1990 I'm told).
I tried a search for Biopace-SG but can't come up with anything.
I want to know what the `SG' designation means. Can anyone say?
Bill
www.nyx.net/~wboas
"Do what you can, with what you have, where you are." T. Roosevelt