From the IIHS gem:
Cruisers are the largest class of bikes. Riders typically are about 45, according to insurance data from the Highway Loss Data Institute. Cruisers mimic the style of American motorcycles from the 1930s to 1960s, such as Harley-Davidsons and Indians.
[accompanying picture is of a Harley-Davidson V-Rod]
Standards have basic designs and upright riding positions, with low power-to-weight ratios that result in a user-friendly motorcycle. Their average driver[ibid] is 39.
[picture is of Triumph Thunderbird]
Supersports are consumer versions of racing motorcycles. Reduced weight and increased power allow for quick acceleration, nimble handling, and high speeds. The average driver[ibid] is about 33 years old.
[picture is of a Kawasaki Ninja Devil ZX-10R]
Sport motorcycles are closely related to supersports. Sport bikes are capable of high speeds but don't have the acceleration, stability, and handling of supersports. The average age of a sport bike driver[ibid, can't resist] is 39.
[picture is of an innocent looking Honda ST 1300]
Unclad sport [ibid] motorcycles are similar to sport bikes and supersports in design and performance but without plastic body fairings. The average rider is about 38.
[picture is of a shockingly naked Honda 919]
Touring motorcycles have big engines and fuel tanks plus room to haul luggage. They're often outfitted with antilock brakes, audio systems, and cruise control. These motorcycles are popular among riders in their mid-40s.
[picture is of a Honda Gold Wing]
Scooters have small wheels, automatic transmissions, and small engines, but larger scooters are becoming more popular. The average age of a scooter driver [sheesh] is 48.
[picture is of a Honda Metropolitan]
