I purchased Tuffy 29 x 3.1 MR inserts. They were 3.5 inches wide (which is what I want) but didn't look fat at all! To test them with our dried mesquite thorns and our goat heads here in the desert, I took a standard thumbtack and gently poked the liner: THAT WAS JUST! Almost no resistance. Does the description say it prevents punctures from spikes, glass and road debris? They won't survive a rose thorn, let alone a goat's head or mesquite thorn. I'm sending them back. I don't know where everyone who drives hundreds or thousands of miles without a flat tire goes, but even my Mr. Tuffy 29 x 2.5-3, which looked a lot fatter than these, easily punctured when I saw that greener Slime sealed many punctures in my tires. Not sure. If they've changed their composition or rely on slime to seal holes, "never got any flats" is true, but more so on slime than Mr. Tuffy. I can't figure it out unless all the drivers are on the sidewalk with the "Never got a flat" sign right now. me in the city
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