I think people are looking for real tires not touring tires and if that is the case go 17" because Michelin is the only half decent tire for 18" Tire worthy of road racing but only in a 160/60-17. If you change to a ZX11 wheel you can put a 180/60-17 with room to spare. A 190/55-17 will fit in fine, now that is a tire and alot of choices.
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