A relatively new group to the stunt scene are Vertical Trix, a three man stunt team from the Coventry area who run Kawasaki ZX-6Rs in their stunt shows, and also use one on their wheelie machine... Essentially a trailer fitted with a friction roller, a rear wheel spindle clamp and a strap to prevent flipping over backwards (there's a bit more to it than that, but it explains the principle) the wheelie machine takes up no more room than a small van, and is regularly seen at Bassetts Pole and Bikers Clearance World in Coleshill, although we caught up with the VT crew at the Rocket Centre open day, and Heaton Park 'A Bike In The Park' last weekend. While riding the wheelie machine is different to wheelying on the road, given that there's no side-to-side movement and the way that the ZX-6R gains traction on the roller is different to how it would on tarmac, it is an ideal way for prospective wheelie fiends to find out just how high the balance point of a wheelie really is. And of course, as you can see from this small video, it is an ideal way to practice some of the more complicated monowheeling manoeuvres... and best of all, it's completely safe, so you'll not experience harm to either your body, or your licence!
More details can be found at Vertical Trix