GREY AND BLACK TREK ALPHA 4500 23 SPEED FRONT SUSPENSION MOUNTAIN BIKE WITH DISK BRAKES
2005 Trek 4500 Mountain Bike – Frugal Average Bicyclist
16" Trek 4500 (6806 B4) - Working Bikes
2003 4500 - Bike Archive - Trek Bicycle
Used, restored and overhauled bikes and parts in Pittsburgh PA
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