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 SL Frameset 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. Set it up with 1x gearing or a front derailleur and continue the Procaliber legacy.