I need to replace my cassette and chain.
I am currently using a 9 speed front and rear D with a 53/39 front chainring. Can I upgrade to a 10 speed cassette and chain without having to upgrade the entire drive train?
If I understand correctly the 10 speed chain is narrower and should work on the rear d, but I am unsure of shifting on the front D.
BTW I am running downtube shifters.
I am sure this has come up, but a short search in the bar revealed nothing.