At the shop I used to work at, back in the late 1980's, a full tune up (mostly inspecting and adjusting and some liquid lube here and there) was $45. But the major thing was we adjusted the brakes, derailleurs, and hubs and if needed, re-lubed the cables/housing on the brakes and shifters, and lubed the drive train. We checked out the whole bike, all bearings and adjusted and lubed. We didn't clean the chain, or remove bearings, although we might squeeze more grease in there sometimes without charging extra.

For $85 back in late 1980's, you got an overhaul. Then we took the chain off, crank, pedals, loose parts and bearings on head set, derailleurs, seat post, freewheel/cassette, BB and hubs, put them in a shallow plastic tub with holes poked in the bottom and into the solvent tank with some ultra-sonic cleaning gizmo and filter. A few minutes later, we'd take the parts out, let drain and dry. And we'd re-install all the parts to spec with lube. During those few minutes waiting for the tank, we deflated and removed tires, inspected rims and rim-strips, and inside walls of the tire. If the bike needed new brake or derailleur cables or new rim strips, we'd call the customer with a new estimate, which might add another $15 in parts. The overhaul took all of 2 hrs really working fairly quickly. So I'd say that with inflation factored in, the $90 sounds reasonable. But this does depend on the bike shop. I do recall, that while the bike was in the shop, it was easy enough to spin the wheels and wipe down rims and spokes, and to then take a clean rag and wipe down the bike. I think customers seemed to always perceive they got a good value if we cleaned up the bikes for them. That would include the exposed BB axles on left and right side between the crank arms and BB, hub surfaces, the seat post, the main triangle tubes, and the top of the right chainstay that would always have a bunch of chain slap marks on it. Those little things might add 2 minutes to the completion of a bike, but it seemed to impress customers a lot. We had a hose out back and remember the early mtb adopters would come in with filthy bikes. A quick gentle misting, with a soft tooth brush on the drive train, rims, and tires would work huge wonders with customer satisfaction and save money on replacing filters for the ultrasonic solvent tank.