Still on original block and chain, and front brake blocks (and it shifts and stops very nicely, thankyou).
Haven't been offroad on it for a long old while (I think the last time was in a forest somewhere, where I went over the handleabars at low speed face-first into a tree).
Largely original from when it was built up (by me, at Edinburgh Bicycle) - though unfortunately I recently had to rebuild the rear wheel with a new mavic rim and spokes due to some scrote reversing a mini-digger into it where it was locked up at a station .. BX23 rims a bit thin on the ground but I'd still like to rebuild it with the genuine article. Also got a taller seatpin having finally got tired of creaking knees...
Other non-Specialized spec (though original timeperiod replacements):
Royce Ti bottom bracket (creaks like a bugger)
Control tech 150mm (I think, though I'd have to measure it) stem
Marin Lite (VERY light - 130g) alloy bars
Xlite stubbies (w. Ti clamp bolts, no less)
Spesh grips are maybe 2000-era.
Shimano 1-sided SPD pedals in place of the original DX-spec SPDs of the era (which I still have).
Rear brake blocks I replaced last year I think.
(pics of details in my profile/gallery thingy)
It could do with some TLC but it's a commute bike - what do you expect!