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^ 15" tyres typically have a larger profile but lower width and obviously radius... No idea on the weight effects this would have but my 16" tyres feel heavier than my 15" ones.
2118's are amazingly heavy in road spec. Magnesium versions like they used on the Cup cars are far too brittle for road use. Plus, they're pretty much the ugliest wheel ever made.
UL's on the other hand, look brilliant in 15". I've been tempted a few times.