Funny you should ask. Yesterday afternoon, I pumped some air back into my front tire, with a 4000s on it, taking it up to 105 pounds. I rode about a quarter mile and the tube blew out, literally, after part of it squeezed through an opening where the tire bead had torn - about an inch long.
I'd only mounted it once, a few months ago, when I got it, and had only ridden it 200 miles since, with no problems until it tore.
I've never seen this before and I'm thinking the tire was defective.
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