I have a 1995 Giant Rincon mountain bike that I inherited from a neighbor. It originally had the following:

42/34/24 170mm crankset
SRAM 3x7 Gripshifters
14/28 7-speed freewheel
Traditional cantilever brakes (which has the crosslink wire)
Single walled rims
26” x 1.95 knobby tires
Rigid steel frame/fork

Most everyone claimed that it wasn’t worth upgrading (at least not in any moderately expensive way). But I liked the geometry of the frame and the bike came into my possession in a manner that has endeared itself to me. So I opted to make upgrades a little at a time until I felt like I had something that was more fitting of how fast I’d become.

Several hundred dollars later, it had the following:

48/36/24 170mm crankset
Shimano 3x8 Revo shifters
Shimano HG31 11-34 8-speed cassette
Acera V-Brakes and V-Brake levers
Double-walled Rhyno Lite/M530 Deore wheelset
26” x 2.0 Bontrager street tires (rated 60 to 80 PSI)

Was it worth it to me? You betcha! (And absolutely no regrets even years later.) It does everything I need it to do and it does it well via a frame that fits me like a glove and one whose appearance I really like. While it weighs 32.6 pounds with the kickstand that I added, I don’t think twice about taking it on my 125 mile rides and it now has 3,174 miles on its odometer. It’s max descent speed thus far is 47.7 MPH and it’s stable and smooth.

My point here is; it’s YOU that has to decide whether it’s worth sinking the money into. For me, every upgrade made it a better bike, which in turn made it all the more enjoyable to ride and it also made the next upgrade all the more exciting to look forward to. Sometimes it pays to upgrade a bike that others typically wouldn’t, as you’ll gain something from the experience that can’t be obtained from purchasing a ready-made better bike; like a genuine sense of achievement and personal satisfaction.

I hope you find this helpful.