Bought two of these a year ago, one to fit, one spare. The one on the bike blew off the other day and looking carefully at the bead it had delaminated and appeared undersize in the area the tyre blew off. I examined the spare and found the bead almost disappeared in the same position on that unused tyre. Clearly a moulding fault Nutraks quality control failed to pick up - too late now to rectify after purchase and both are going in the bin, one unused. My advice would be if you buy check the bead when they arrive, if its inconsistent send back.