Modernizing a bike from the 80s or 90s really doesn`t present any major issues. You can still buy brand new and smoothly working replacements straight from your LBS, Amazon, or any of the big online bike stores for just about anything on your bike as long as you don`t care about bling factor. Finding high end fancy-pants parts for anything other than "flavor of the day" is where you`ll need to start hounding E-Bay.
Originally Posted by PolarBear007
If you want to keep the drivetrain 3 X 7, you can easily do that (low level parts, but they`ll function as well or better as what you have now), or you can go whole hog with a zillion Dollars worth of high end 10-speed parts, or anything in between. The only thing you won`t be able to do without frame mods is convert to disc brakes, although you could switch from straddle cantis to "V" brakes as long as you replace the levers at the same time.
EDIT: If you go looking for replacement or upgrade parts for anything, note that an unknowledgeable or unscrupulous vendor or LBS employee might well tell you that you can`t do this or that. You`ll be doing yourself a big favor to research "speeds", cable pull, hub width compatibilities and work arounds for yourself before starting. Sources such as Sheldon Brown, Park Tools, or Biketutor will give you all you need to know, or you can just ask on the mechanics or collectors subforums here on BFnet or any other big cycling discusion forum. People will gladly explain exactly what you can or can`t do for any stage of a refurbishing.
This has been a work in progress but I believe it is finished now. Put it on the trainer to get her all dialed in.
1993 Trek 830 Antelope
Attachment 371683Attachment 371684
1984 Specialized Stumpjumper. His name is Ludlow. Nic put this together for himself. Nic is 16.
Ludlow is a classy ride. I'd be tempted to put a 50 or 52 ring on the front and drop the bars down to a roadie position. Then I could get to trailhead and back a little bit faster.