Hi! I have for a long time this early 2000's Trek Alpha 4500 and I want to do an upgrade project on this bike, what things do you recommend me to upgrade
2005 Trek 4500 Mountain Bike – Frugal Average Bicyclist
TREK 4500 Disc XC Hard Tail 2012 - Pedal Room
IT TOOK ME FIVE YEARS to BREAK EVEN on the TREK ALPHA 4500 MOUNTAIN BIKE! - YouTube