Rides Majestic
Join Date: Jan 2013
Location: Westfield, MA
Posts: 1,339
Bikes: 1983 Univega Gran Turismo, 1970 Schwinn Super Sport, 2001 Univega Modo Vincere, Self-Built Nashbar Touring, 1974 Peugeot U08, 1974 Atala Grand Prix, 1986 Ross Mt. Hood, 80's Maruishi MT-18
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I checked the vintage Trek website for 1990 and didn't see a 400 model, so I looked at 1989 and found it was the last year of the 400. If your bike is a 1989, you might be in luck. If you look at the specs for 1989, you'll see that it has a 7 speed Suntour Alpha listed. For every other bike, they specify if it is a cassette. If they don't specify, I would assume it is a freewheel. If that's the case, you can replace it with a shimano 7 speed freewheel and just about any shimano derailleurs (Claris, sora, etc). Then get some Shimano Tourney 7 speed brifters and you've got a sensible and cheaply upgraded bike. The 7 speed suntour freewheel would be worth some decent money as anyone running 7 speed suntour has to use their freewheels in order to get it to index, and they aint making them anymore.