I think the OP was asking for the difference between a sport tourer and a TOURER, not a sport bike... but the information is still good to have.
A Tourer will have more creature comforts... think of this as a large comfy Cadillac, with lots of cargo space, bells and whistles and a great, comfy ride. It is designed to make you comfortable on long hauls. An example is Honda GoldWing.
A Sport Tourer, also of late have been adding more bells and whistles, but they offer a little more attitude in performance and handling, with perhaps a little less cargo space. Think of this as a sporty sedan, like an Audi or bmw... perhaps not as cushy a ride as the caddy, but certainly makes up for it in performance and handling. They are also built with long hauls in mind, but for the sportier person who still wants to do perhaps some canyon carving, and rip the throttle open from time to time just for the fun of it. An example is the Kawasaki Concours 14 pictured above.
Not that you can't do this in a Tourer, but Tourers are not built for performance, but for good solid power (they're usually no slouches either with their big powerful engines!), and decent handling. But a good rider can take a full dress tourer and carve some canyons pretty well too...
Tourers also have lots of bling and chrome parts, ST's have less of that as their goal is more performance oriented.
Then you have Cruisers that fall into the Tourer category, which typically are mid sized bikes with some touring amenities that are OK for long hauls with soft or hard saddle bags, floorboards, sissy bar, windshield, etc; but still offer a little more nimbleness than larger full dress Tourers, and make it a little easier to also use the bike for short trips, and maneuvering around town. The nimbleness also allows for a little easier canyon carving as well than in a bigger Tourer, but certainly not like a Sport Tourer will.
These are not definitive statements, but just some general "guidelines." :tongue:
I'm sure more experienced people will chime in with their vast knowledge as well. I was looking into a Sport Tourer, so I was very interested in the C14, but that may be my next (or other) bike
