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
16" TREK 4500 Aluminum 24 Speed Hardtail Mountain Bike ~5'4"-5'7"
Is Trek 4500 Mountain Bike A Good Bike? [Trek 4500 Review]
TREK 4500 Alpha Aluminum Rock Shocks 20" Mtn Bike Red Black REBUILT | eBay