Change out "old" Tiagra shifters?
I ride a an '07 Novara Randonee with Tiagra brifters. I've put about 20,000 miles on it and I still like the shifters and most everything else about the bike, but have heard from others that brifters this old can break out in the middle of nowhere and leave one shiftless. Does anyone have experience to shed light on this potential problem? I will be doing some long distance touring and don't want to get stuck with no gears while loaded and far from a shop. I am old and have a crapped out knee so I shift a lot to stay in an easy, knee friendly gear. I've thought about carrying a set of downtube friction shifters with me just in case. They are light and I have years of experience installing them and shifting with them. Any thoughts?