Originally Posted by
PeteHski
Reliabilty is a total non-issue with modem indexed shifting. It certainly isn’t a reason to choose friction shifters.
Reliability is very good with modern STI, but they do tend to gum up with high mileage. Especially in cold weather.
Whereas downtube shifters are much more foolproof. There is little mechanism to gum up, and very little cable housing to wear out. Another advantage of DT shifting is the mechanical feel. You can really feel the gear teeth engaging with the chain.
Downtube indexed shifting is the best option option for people who want to try out DT shifting. As for friction shifting - I see no reason for that to exist anymore.