Speaking of 'bike' controllers, I have Thrustmaster's motorcycle controller. It's pretty good - especially for a sim like SuperBike 2000/2001, tho it takes time to get used to the setup after coming from a car controller.
It's set up a bit different than in real - no foot pedals for gear change or rear brake - you do that with hand buttons and the hand brake style controls. But you basically have the same control as in the real world: throttle, front rear brake, tilt, turn, clutch and gear change. Tilting the whole handle bar assembly left/right tilts the bike. Turning the bar turn the wheel, though you do little of that at the GP level - tilting mostly.
It's a pretty specific controller - not too too many bike sims out there... It can mount on the desk, or has a 'plate' that you sort of slip between your legs and chair - interesting piece of game ware really