Originally Posted by
Bill Kapaun
Depends on if early 90's or not.
Some early 90's models were equipped with Suntour drivetrain parts which are a bit problematic to obtain.
IF Shimano, no problem to upgrade or maintain.
Some early Shimano were Uniglide cassettes, which will be problematic to some extent. The earlier, the more problematic.
Later ones can have a newer style Hyper Glide free hub installed. A Uni Glide will have the smallest cog threaded on.
Shimano Cassettes & Freehubs
I like suntour but it's a mixed bag. You're dealing with the second hand market for suntour cassettes; if the bike came with a freewheel, then you have more choices if you don't mind friction shifting.