Originally Posted by
Lombard
I still don't understand why you say "the chain determines which chain rings can be used". This implies you are saying the number of speeds rating of the chain ring must match the chain. Am I missing something?
All I am saying is that (A) the cassette determines which chain to use, and (B) in turn, the chain determines which chain rings can be used. (A) generally has a 1:1 correlation, i.e., an 8-speed cassette requires an 8-speed chain, a 9-speed cassette requires a 9-speed chain, etc. Whereas, (B) may be broader. For example, I use 10-speed chain rings on an otherwise 11-speed drivetrain.
Technical FAQ: 10- and 11-speed drivetrain component compatibility - VeloNews.com