I bought a bike off CL for $30, I think it's a Motobecane. It is completely unmarked except for the chrome winged W at the top of the fork. I don't know if it's a French or Swiss bottom bracket, I guess i should know if I want to take it off.
Anyway, this bike I think was never ridden. The teeth of the freewheel are unmarked. Most of the steel components have lots of little rust spots, I guess just from sitting for so long, but the chainring teeth look unused also. The bottom bracket feels OK, not completely smooth, but definitely usable. From the lack of wear on the bike I'm guessing that when I take it off there will be no wear on the cups, just no grease. It's probably completely dried up.
I don't like cottered cranks. Also the big chainring is a little bent. I would like to replace them with some Shimano 105 cranks I have laying around. Can I stick an Octalink spindle in there while still using the original cups? How about a regular square taper spindle? what length would it need to be?
I don't think this is a particularly great bike, considering the lack of lugs everywhere except for the front, and the cottered cranks. But it's pretty lightweight for a beater and with the brake arm clearance will let me put on some knobby tires for snow riding.