A roadracer friend told me to remove the security bolt from the rear wheel of my Vincent. He pointed out that they are a pain to deal with when changing tires, sometimes pinching the tube. He also said that I would put more horsepower (in reverse) through the front wheel when braking than the Vincent could ever put through the back wheel. This is probably correct.
I followed his advice and the rim turned inside the tire on my second startoff! The valve stem was ripped out and I had an instant flat.
I should point out that this was an older tire. I don't like to take chances though so I have reinstalled the bolt. There may not be huge horsepower at play but there is more torque than a couple of 600 cc superbikes put together and a huge rotating mass for flywheel effect.
The Norton doesn't have quite the flywheel effect or lowend torque of the Vincent, but it is great by most modern standards.