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nubbzcummins · 08-31-2009, 12:17 AM

My current tires are 325/55/22 and weigh 68lbs each and are 36.1" tall on a 55lb wheel. So Tire/wheel combo is ~123lbs each. I'm wanting to go to a 305/45/22 in the same tire which weigh 50lbs each and are 32.8" tall. This will save me 18lbs or 17.1% in rotational weight for each tire/wheel combo but will affect my overall drive ratio by 10%. Also the later tire will have less frontal area being shorter and slightly narrower. I drive 90% highway and 10% city through slow rolling hills. How should this affect my FE?

08-31-2009, 12:17 AM	#1 (permalink)
nubbzcummins EcoModding Lurker Join Date: Jul 2009 Location: North Carolina Posts: 56 THE DODGE - '06 Ram 2500 ST 90 day: 22.64 mpg (US) The Saturn - '08 Vue XR 90 day: 21.94 mpg (US) The Odyssey Van - '011 Odyssey EX-L 90 day: 29.1 mpg (US) Thanks: 0 Thanked 2 Times in 2 Posts	Tires and FE ?'s My current tires are 325/55/22 and weigh 68lbs each and are 36.1" tall on a 55lb wheel. So Tire/wheel combo is ~123lbs each. I'm wanting to go to a 305/45/22 in the same tire which weigh 50lbs each and are 32.8" tall. This will save me 18lbs or 17.1% in rotational weight for each tire/wheel combo but will affect my overall drive ratio by 10%. Also the later tire will have less frontal area being shorter and slightly narrower. I drive 90% highway and 10% city through slow rolling hills. How should this affect my FE? (Support Ecomodder.com & get rid of these annoying ads!)