George,
I think the helium filled chains and freewheels were the lightest things going at that time. Some guys even purged the helium and went with hydr ogen. ;-)!
Brian Baylis
La Mesa, CA
Sorry, I couldn't resist.
What were among the lightest Italian chains and freewheels during the pe riod 1970 through 1975? Thanks for any help. George
George Hollenberg MD
CT, USA