Fitting Compact Double on Old Trek
After riding a bunch of new bike candidates to replace my faithful but worn 1986 Trek 400 as my commuter/light-touring bike, I haven't found anything that I like a whole lot better, at least not enough to make me part with $1300 or so. So I'm thinking of taking it apart, cleaning everything up, building up some new wheels, and maybe fitting lower gears.
Ten years ago I added bar-end shifters, fitted a new 7-speed rear cluster with a 32 big cog, and replaced the 39 in front with a 38. That's worked pretty well, but there are big hills where I live, my knees have seen better days, and I'm considering loading the bike this summer and taking a week-long tour. I think I could use a little more help on the low end of the gears.
Since my Sakae SX crank/old-style-spindle BB is original and basically worn out, I could retrofit a triple and get my lower gears, but I've never liked triples and it sounds like this might need new shifters, FD, RD, etc. So how about a 50-34 compact double? Everybody seems to love the R700 Shimano setup and I can pick one up with shimano BB for a pretty good price. AFAIK
, my Trek has a very standard 68mm, English thread, 1.37 BC setup for the bottom bracket. Does anyone see any issues with fitting a modern compact double like this? Will the chainrings be on the right centerline for the FD and rear driveline? I'm Okay with fitting a new FD, but I thought I'd see if the old one works first.
Thanks for any guidance.