Without measuring the weight differences of the tires, it's hard to say what, if any, the effect would be. Pirelli's are often quite light, and assuming that they weigh significantly more, or even more at all, compared to a 130/80 Dunlop, may turn out to be much ado about nothing. I agree that they are taller, and do affect the gearing ratio, similar to adding a tooth on the front sprocket.
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