I think it's best to store them upright. I've always understood that tyres stored flat for some time are difficult to fit. Apparently the beads 'droop' after time, and won't seal on the rim come fitting time. I've seen tyre fitters really struggle with uncooperative beads. It's the fitting that's the problem, once the're on and inflated everything is ok. I don't suppose it would do any harm to turn them now and then during storage.
Edited by Ernied on 30/08/2010 at 22:29
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