I've got a 1993 Diamondback Ascent that I use for commuting. The bike is in pretty good shape and, believe it or not, still has almost all of the original components. One problem that I've had with it for as long as I can remember is that the front shifter will not push the chain fron the middle to outer chain ring. The shifter itself does not seem to have another position for this outer ring. They're pretty crummy Shimano Atlus A10 indexed shifters with integrated brake handles that came with the bike, so I've thought that perhaps with age something in the gearing of the front shifter broke and it no longer can shift to that position. That, or Diamondback put a double shifter on a bike with a triple crankset (which makes no sense). Anyway, I've tried making every kind of adjustment I can think of to the FD itself just to rule out that possibility (limit screws, cable tension, etc), but to matter what I do I can't escape the fact that there still does not seem to be a position in the front shifter for the outer ring. Has anyone else ever experienced this? Is there an easy solution that I'm missing?
I'd like to replace the shifters with something at around the same level, and I was thinking that the current Shimano Atlus (model ST-EF29) shifters would work well with the 7 spd setup that's already on the bike. One question I have here is will the integrated brake handles on these new shifters work with the older type center pull cantilever brakes that are on the bike already, or would I have to switch out the brakes for the v-brake type?
I've always like this bike a lot and would like to get it back in better working order, so thanks in advance for any advice