I happen to have a 1999 Stumpjumper Comp here at the moment. Acquired it for a friend, you understand, not really my cup of tea.
It is definitely a 1999, as per Bikepedia. However Bikepedia says the tubeset was M2XX, but this example has a sticker saying M2X, which incidentally is at the foot of the down tube, not the seat tube.
It has a gusset with S stamped on it on top of the top tube, it has no disc mount and it has no chain stay bridge.
Same as mine. And yes my "m2x" is on the down tube not seat tube as I posted earlier.
Yours too must be mirror blue if a 99 comp.
Why did they puy m2x on the downtube if by then it was made from m2xx. And, what is the difference ?
1997 GT Yellow Karakoram (had from new)
1999 M2 Mirror Blue Stumpy Frame (out from under the bed. Rebuild time!)
2010 Yeti ARC
2011 Yeti ASR-5A