The bolts and bolt holes are different. The 63 has modern-style c'ring bolts.
Wow, $700! And to think I have one of these beauties in top condition! Now I'm jonesin' to see if I can top the $629 that I got for a pair of titanium Sims Lightning cranks a few years back. Of the two top bidders on my Ti cranks, one was a crank collector (Europe), the other (Japan) bought nothing but Ti, based on their respective histories.
David Snyder
Auburn, CA usa
Maybe a dumb question, but what is the difference between Stronglight 57 and 63 cranks? There are some visible differences in the chainrings but the cranks look very similar.
Hugh Thornton
Cheshire, England