Differences betweek Trek FX Bikes

[Zen]

I have the 7.3 and the 7.6

The 7.6 is my "road bike".
The 7.3 would be a good commuter. I ride mine on the C&O Canal towpath.

When I was in NYC, I rented a 7.5 and rode it across town. It was great.

The 7.3 is rather heavy, if you think you're going to ride a lot I don't think this is the bike for you.

Basically, as you go higher in the series the bikes become lighter and faster and the tires get skinnier, though none would be termed a road bike.

They also become more expensive