I just worked on the rear wheel. It was out of true in a general sense, and I was able to true it up pretty well. The nipples all still turned, which was one thing I wasn't sure of. Bearings seemed to be in good shape, and I re-greased them.

The front wheel is out-of-true as well, but seems to have more of a definite "bump" in it, as opposed to just being in on one side and out on the other, so I don't know how well it will true up, but I'll try it.

The handgrips are old hardened plastic that if anything seem to be older than the bike, and they say "Schwinn" on them, so it may be an honest-to-goodness Schwinn Heavy Duty, albeit made in Taiwan. The coaster brake arm is a Shimano with some numbers, no markings on the hub itself that I see.

One thing kind of odd is that the front sprocket seems to be unusually lop-sided. The chain is noticeably loose on one half of a crank turn, tight on the other half of the crank turn. The crank bearings don't seem too out-of-whack, though I haven't disassembled the crank bearings to see.

I've wondered how they maintain these at chemical plants. Is it every man for himself? Or do they have a couple of guys that just spend their day going from bike to bike checking on bearing grease and whatnot?