I think I figured a way to make 37s lighter than 35s on the same wheels I'm already running(aev saverge). Do away with the spare, mount a viar system under the hood( cheaper than a 37"tire), and keep a plug kit in the center console. I would also be able to drop an additional 39 lbs from my swing away spare tire carrier. I've never not run a spare, and the worst damage I've had to a tire was easily fixed with a plug. Another pro would be I could actually see out of my rear window before backing over a Prius. Haha. Also this would lower my COG.