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can anyone tell me who makes a 17" ultra heavy duty tube (for a DR650)? The usual people (Michelin, Bridgestone etc) seem to only list 18" and up. I've found one 17" so-called Ultra Heavy Duty tube but it's only 2.8mm thick!!! I was hoping for 4mm.
I'm running a 18 inch ultra heavy duty tube in my 17 inch wheel and it seems to be fine, I think plenty of blokes are doing this. Doesn't seem to be a problem. Hope this helps.