Originally Posted by
GFish
Had my first ever pinch flat last Friday, 21 mph on a flat road. Using 25mm Gatorskins pumped to 110 psi, rear tire. I went back to see what I ran over. There was a solid steel wedge, apx. 1" x 1" x 3/4" thick. The tube blew out with two holes opposite of each other. I weigh 175 lbs, didn't think I was to heavy for the volume or that the psi was to high. In my case, I think the hard steel edge was the cause.
GFish; A chunk of crap that size would do it...whether metal, wood, glass or whatever...including ice. Don't think that flat falls in the formal definition(sic) of a pinch flat, but I'll go along with you on it. I would note that on my commuter, tourer and tandem bikes, I would not have really noticed a piece of FOD-bait like that. Schwalbe Marathon Plus in 700c x 1 3/4" on 48-spokes at 65psi are almost unflatable, but undoubtably take a few extra watts to keep spinning [
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/K