Rear derailleur
Rear derailleur currently Shimano Deore XT (swapped from original XTR)
Brakes
Shimano XTR disc brakes — strong and reliable, occasional slight squeak
Tires
Schwalbe Rocket Ron Evo Super Ground (newer, good tread)
Saddle
Selle San Marco Aspide Power (upgraded from original)
Stem
Ritchey WCS Carbon stem & bar
Handlebar
Ritchey WCS Carbon stem and bar
Cassette
Chainrings/cassette replaced multiple times over the years