Thanks to all of you for the info and advice. Retailer is taking it back and ordering another. They cannot decide if safe or not so they are erring on the safe side. Very nice of them. If the next one turns up the same, I will return that and maybe get some over-the-top-bombproof Schwalbe Marathon Green Guards. Though I like the look of the Nifty treads and narrower width of the Niftys. For now, I'll just sit on my Rumpkins.
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