Hello, first time post!

I used to participate in the occasional cross country race years ago and for some reason ended up putting the bike in storage for years. It's a 1997 Specialized Stumpjumper Comp hard tail frame. I have been riding it occasionally this spring and still love it but the drive-train is getting worn and one of the shifters disintegrated on me so I am wondering if it's possible to update everything but the frame? I am not so worried about time or budget on this one, I just love the frame and geometry.

so question is, what all can I upgrade? Disc brakes? 9 or 10 speed? Even wheel size, can I get away with going a bit bigger?

1997 Stumjumper comp options-bike.jpg