This a lot of questions rolled into one: but first some background. I am pretty good at working on bikes and I want to build or buy a fast commuter, something with fat fenders, 700x32-ish tires and a rack, but still able to kick ass in traffic. I've been flirting with just dropping $900 on a Surly Cross-check, but I also own a sweet 70's or 80's Peugeot, realy nice brazed renolds 531 steel frame. I have a lot of parts laying around too, and so most of my inquiry is about compatability of drivechain and deraileurs, and what it would take to get this bike up and racing some cars.
I will probably rock downtube shifters on this bike or maybe some bar-end shifters, I want to stay fairly low-tech. I will also probably buy a new back freewheel but stick to the original 6- speeds instead of trying to add more speeds.
I also already have:
A set of ultegra double race cranks for a 9-speed
The original front deraileur
back deraileur: I have a dura-ace short-cage 9 speed or an XT MTB deraileur
So if I run six gears in back am I going to run into trouble with the back deraileur, since the chain might be wider than those are built for? or can I maybe get away with it? will a 6/7 gear chain have problems running on the ultegra chain rings? I dont think so.
O maybe I should just look fo a 8/9 speed freewheel and hopefully that will fit in the hub spacing no problem, then I could rock the dura-ace deraileur in back and no problem with the cranks either.
So I would love to hear any feedback, and advice on whether it's worth it to fix this guy up. I think it could be, and a lot cheaper than buying a brand new bike. But I only want to do it if it's going to run smoothly in the end and be a great bike.