I've got a PX-10 in an incomplete state (missing rear wheel, crappy aftermarket stem, chipped paint, etc.). It's a beautiful bike, and I want to turn it into my new commuter. My plan is since it's already incomplete and missing original components, to upgrade the drive-train to 7 speed shimano. I'd like to set it up with the RSX gruppo, which has STI shifters. I've got several questions about the feasibility of this, however.

-The current dropout spacing is 120mm. Will I need to cold-set the frame, or can I get away with just spreading the dropouts when inserting the 126mm 7 speed hub?

- Will I be able to keep the original stronglight 93 crankset and use it with a 7 speed chain?

- If not, will I be able to attach a modern shimano square taper crankset to the spindle of the original bottom bracket?

- Is this a bad idea, should I just keep it at a ultra 6 speed with friction shifting, or (god forbid) a 5 speed? Not that 5 speed isn't cool, but for a commuter bike I want lower gears and easier shifting.

- How good are the RSX brifters?