[quote=RodKnock;1289877]And debated above too.
15" aluminum wheels with 15" tires are lighter than 18" aluminum wheels with 18" tires. So if you desire light-weight wheels and tires for performance, go with the smaller wheels and tires.[quote]
I think I’ll stand behind Bruce on this one as he has tried them all …
Post #18 from the 15” vs 18” discussion
15" vs 18"
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Originally Posted by Cobra #3170
You put him on 18" Hoosier A6's with proper camber and spring rates and he would pick up 6 seconds a lap. I ran 15" back when they actually made good slicks for 15's (1970's), LMS 16" slicks in the 1980's and 1990's on wider than stock rims (9.5 F and 11 R) and now 18" on (11" F and 12" R) and I can tell you there is no comparison. Yes, part of it is modern compounding but the steering response is so much more precise with low aspect ratio's I would never go back. There is also the problem of tire distortion under high loads with large aspect ratios especially with poor suspension geometry. There is a reason that the automobile and tire companies gravitated toward larger wheel diameters, they are better.
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The weight savings argument is a penny wise pound foolish proposition.
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As for stock size tires, that's pure unadulterated NONSENSE. Please name a couple or few performance cars in automotive history was purchased new and then on "Day 2", said owner did NOT go out to the local tire seller buy bigger tires?
Yep, all those Porsche, BMW, Mopar, Chevy, Ford, etc. owners kept those factory stock-sized tires on those factory stock-sized wheels. 
The stuff you read on the Internets nowadays.
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My point exactly, so don't sell 15" wheels running 295-335 rubber as authentic or classic 'cause they ain't.