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Tyre won’t seat nicely – bead too short?

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  • January 21, 2014 at 3:36 pm #20524
    cat1commuter

    The pair of Schwalbe Marathon XR 26×1.6″ tyres which I have on my winter commuting bike won’t seat properly. The previous pair of the same model were fine. In fact I liked them so much that I bought this extra pair some time ago when I discovered that Schwalbe had discontinued this model. They’re folding tyres, with a kevlar bead, and it seems that the bead is a little too short, which produces one or two low spots on the tyre, so I’m not rolling on round wheels and the ride is a bit lumpy. I hoped they’d settle in, but I’ve done a few hundred miles and they haven’t stretched. I’ve also tried taking them off and trying to stretch the bead, and have blown them up hard to greater than running pressure. I’m about to give up on them and buy some different tyres, but can anyone suggest something I haven’t yet tried?

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  • February 2, 2014 at 4:44 pm #769663
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    cat1commuter

    Success! Just tried this.
    Success! Just tried this. Diluted a little washing up liquid with a little water. Wearing a nitrile glove, and with wheel flat on floor, tyre fitted but with inner tube deflated, it was easy to smear liquid along the bead with a finger, then flip the wheel over to do the other side. The tyres have a max. inflation pressure of 85 psi, and I went up to 100. Rear tyre went “pop”, and bead was seated nicely. Front tyre had a spot where the bead refused to pop out. I deflated it again, put more liquid over the spot which refused to emerge, and re-inflated to 100 psi. Bead still didn’t pop out. In desperation I pressed on it with the rounded, blunt end of a plastic tyre lever, and it eased out into place. Let tyres down to working pressure of 55 psi front / 60 rear, and the beads stayed in place. There’s a tiny ridge on the tyre at the edge of the area which is designed to contact the rim, and I think this might have been catching on the edge of the rim, preventing it from seating properly.

    January 21, 2014 at 5:40 pm #769661
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    cat1commuter

    Thanks, I’ll give that a try.
    Thanks, I’ll give that a try. (Though in my case it will have to be Ecover!)

    January 21, 2014 at 4:06 pm #769659
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    NIrish

    An old friend suggested fairy
    An old friend suggested fairy liquid rubbed along the side and then over inflating to smooth off.

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