This higher numbers are upgrades. Trek website
Upgrades on 7.3 FX from 7.2 FX
IsoZone grip and handlebar system
Bontrager Race All-Weather Hard-Case tires
Alloy FX Fork
This higher numbers are upgrades. Trek website
Upgrades on 7.3 FX from 7.2 FX
IsoZone grip and handlebar system
Bontrager Race All-Weather Hard-Case tires
Alloy FX Fork