Quote from Wiki
http://en.wikipedia.org/wiki/Sport_touring_motorcycleDifferences to sport bikes (Comparing a Sport to an ST) though in most cases the lines are blurred.
A larger fairing than is implemented on sport-bikes, and an adjustable windscreen for better weather protection.
A frame that is usually designed from scratch to provide a more upright, less aggressive riding position ("all day comfort").
A longer wheelbase and more relaxed steering angle are usually also incorporated. These provide more straight-line stability than most sport bikes, but not to the degree that most pure tourers do. The addition of these heavier parts (full fairings, longer frames, heavier engine components) also serve to increase the ratio of sprung to unsprung weight, giving the bikes a smoother ride over poor surfaces.
ABS is common on sports tourers, and some manufacturers offer linked brakes and traction control.
A larger fuel tank to extend the range between fueling stops. A special fuel economy mode may exist to increase mileage.
Ground clearance is usually left fairly high, permitting more sport-like riding on twisting roads than on a pure touring bike.
Automotive-like shaft final drive is less maintenance intensive than chain drive.
Locking, detachable waterproof hard luggage, color- and style matched to the bodywork, is typical.
Luxury and convenience features such as electronically adjustable suspension, heated grips, cruise control, electrically adjustable windscreen, navigation system, electrical sockets, multiple tripmeters and tire pressure sensors.
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My previous CX500 filled both commuting and touring rolls and that would apply to the CX650 as well.