Not sure if this will help but at least give you some perspective. I just received today a set of actual OEM 17" Equinox wheels, with TPMS sensor (for a dedicated set of winters I got off ebay).
I weighed myself on a digital scale with and without holding the Wheel.
The Factory 17" OEM Equinox Wheel, model year 2010, 2011, weighs 22.5lbs
I imagine an 18" can't be much more, maybe another 2-3 lbs or so???
I was reading the Edmunds GMC Terrain long-term test blog the other day and it stated:
"As you can clearly see, the wheels that bolt up to those studs are 18x7-inch aluminum alloy castings with a 46 mm offset. The tires on our Terrain are P235/55R18 (99T) Michelin Latitude Tour all-season rubber. Mounted together, each assembly weighs about 51.5 pounds."
Well winter time is almost here, so it's time to take off the 20" rims and put back on the factory 17's. With all the questions about weight, I thought I would weigh each size. I was getting about 2 miles less per gallon with the larger and heavier rims. The 17's weighed in at 49 lbs and the 20's came in at 63 lbs. Each tire had 35 psi. Hope this helps.
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