I'm going to guess you didn't air down enough or hit the rock to hard/fast. If you air down to about 12PSI the tire becomes twice as wide as the rim. This creates a barrier so the rim should of had rubber between it and the rock. Look at my video here fast forward to 1:26 this is aired down to 15-17 PSI I think it was but you can see how much the tire mushrooms out protecting the rim from the rock.
The first time I did this, I wasn't sure if speed might have been an issue. i wasn't going very fast, but I was moving. This last time, I know exactly where and when it happened. There was only one rock, about twice the size of a basketball, but shapped like a footbal. It had a scuff mark on a small sharp spot (the pointy end of the football) from the impact with the rim.
Sal - I watched your video and I see what you are talking about. My circumstances were a little different. This was the front tire, and it was turned all the way to side at the time. I am speculating this sideways force is what pulls the tire sidewall over enough to expose the rim. I wonder if airing down more as you suggest would make that pulling sideways of the rubber off center from the rim worse, or better? My thought was a stiffer tire (more psi) should stay more true to form right over the rim.
The best things in life can not be found on a map; they can only be found while Wandering.
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2007 XK - 4.7L Flex Fuel // Rocky Road 2.25 lift // Rocky Road Super Sliders // Toyo Open Country 265/70R17 tires // 4xGuard Front Guard // 4xGuard Belly Guard // 4xGuard Matrix-HC with optional front hitch // Warn XD9000I hitch mounted winch // Graco Carseat for the Youngun
http://www.xk-forum.com/blog.php - The Wild(life) Side of Jeeping
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