I'm not saying you're wrong, but I thought these tyre products were there to prevent premature ageing and cracking of the tyre wall ?
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And i`m not arguing against Bob, as me don`t know any different, but what is "shortening" in the scale of things, given the respective life of a tyre nowadays anyway? Surely having new 'smaller' tread depths shortens the lifespan far more than any gloss product?
what u thinky?