I don't understand the numbering system on TREK bikes.
Is it the lower the number the better, or the higher?
What is exactly is the difference?
This higher numbers are upgrades. Trek website
Upgrades on 7.3 FX from 7.2 FX
So....Not much. I'm currently working on one of these, an older 7.3, and it's equipped almost exactly as the 7.2 is now. Has the steel fork and the regular handlebar grips. Tires are Bontrager...Don't know which model.
Nice bike, I'm considering keeping it. (I refurbish bikes for re-sale)