Bicycle tyres main sizes

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Watch out, a 26 inch can hide another!   Recently a customer called us to say « the tyre I received is too big for my wheel. Yet I did buy a 26 inch tyre! ». He had in fact purchased a 26 x 1.00 tyre with an ETRTO of 42-584, when he needed a tyre with an inner diameter of 559….Both tyres are « 26 inch » tyres, their outside diameter is about 26″, but their inner diameters – the one that must match that of your wheel – differ Un …