In a recent thread about weight limits, the issue of tires came up, ineveitably, as did the suggestion that a car tire on the rear added some margin of safety for high weight loads. I'm a fairly conservative rider, and although I've never scraped a footpeg, I can't help but wonder how a car tire, with a relatively sharp corner between the contact portion and the sidewall, corners. Is there an abrupt shift of the bike as it reaches or goes beyond the edge? Does cornering eventually round out the edge? Etc.???