Back in the day, the venerable Procaliber was THE cross country race bike. Guess what? It's still THE XC race bike. Trek's Procaliber 9.9 SL is made for one thing: crushing XC race courses and those who dare try hang on your wheel. That's not to say it only races. Shocking your friends, besting personal times up hill climbs, or just trying to squeeze that after-work loop in before it gets dark, the Procaliber is down. The full carbon frame uses Trek's tried and true IsoSpeed decoupler for the ultimate in lightweight efficiency that gently hints at a full-suspension rig. Up front, RockShox's inverted RS-1 leads the charge with a custom 100mm fork. And they don't call it "pro" for nothing, as this baby rocks XTR 1x11 gearing powered by full carbon Race Face Next cranks while XTR Race discs rein in the velocity. Everything on it is carbon: the Bontrager bars, stem, post, saddle rails, DT Swiss wheels, you name it. Meet the new boss. Same as the old boss.