Guy i work with goes reguarly on a bike, a friend of his was a very experienced rider, quick but in a very controlled manner, never frantic or risky.

He came round a corner at the ring and hit some oil on the track from an accident that had just happened and had a very nasty accident that left him paralysed.

Fuck that shit, its not you the bike or the ring thats the problem, its spillages etc, and with such high speeds and so little run off and so many blind corners its pretty much a case of when not if you die at the ring if you ride there reguarly enough IMHO