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I see only one extra gain for 18", and it might be mostly for twin owners in EU. All new top UHP tires like MPS4S, Conti sportcontact6, Goodyear eagle f1 SS are available only beginning with 18" size, limiting a bit tire choice to earlier tire models for those running 17", or getting tires from other classes.
Not an issue for US twin owners, as eg. MPS4S available there in 17" too.
Rare occasions when one upsizes wheel for BBK clearance imho shouldn't count, as it's not clearcut that all 18" will have better clearance as to some 17", and one buying BBK usually does homework, which wheels it clears.
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