Yamaha R6 is NOT a superbike, It's a supersport!
A super sport is basically a road legal 'racing replica' with:
Over 400cc up to 600cc 4 stroke 4 cylinders.
Over 500cc up to 675cc 4 stroke 3 cylinders.
Over 600cc up to 750cc 4 stroke 2 cylinders.
Whereas SuperBikes have an engine configuration of either 1,000cc 4-Cylinders or 1,200cc 2-Cylinders.
Unlike MotoGP, the bikes raced in WSBK aren't prototypes, they're production models (albeit heavily modified) and are available for civilian ownership because It's a mandatory condition to participate in WSBK!
Whereas in European Superstock championship, the bikes raced are almost un-modified 1,000cc replicas!
Since you're buying a 'crotch-rocket', thought you'd be interested in this little trivia!
Good Day!