Well some people have great luck with it, I am one of those people. I have several thousand miles with it now and only two flats, one of which was completely my fault since I had let the fluid dry up. Both of my flats happened at Slatyfork, WV. If you have ever ridden there you will understand how I ended up flatting.
Some people don't have the same luck.
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I may be fat but I'm slow enough to make up for it.