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I had a fat bike slow flat a few weeks ago, then another slow flat Sunday so I pulled the tire off again. I think the issue might be that the tire casing is starting to break down at regular intervals along the outside knobs on one side of the tire. I patched the cracked spots to see if I can stretch some more life out of the tire. Plenty of height left on the tire knobs, but the rubber has flaked off the casing in a lot of spots along the sidewalls.