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zonker · 05-15-2011, 05:59 PM

this might help on the speedometer calculation...

http://www.miata.net/garage/tirecalc.html

as far as whether or not there is benefit, it's a mixed bag of issues here, so it could help or hurt.

you'll need to be more specific about the suggested alteration to determine if you'll see improvement or not.

wheel weight, diameter, tire width, aspect ratio, and tire design as well will all contribute whether or not there will be benefit.

and... believe it or not, many alloy wheels weigh more than their steel counterparts, so an exact wheel choice will also be needed to help determine if your new wheel is eco friend or foe.

05-15-2011, 05:59 PM	#5 (permalink)
zonker 500 Mile Metro Traveler Join Date: Jan 2011 Location: Sun City, CA Posts: 183 '89 Dakota LB - blue - '89 Dodge Dakota V6 LE 90 day: 19.8 mpg (US) '17 Fiat 124 - SunFiat - '17 Fiat 124 Spider Classica 90 day: 30.51 mpg (US) '89 Metro - The Egg - '89 Geo Metro Base 90 day: 50.71 mpg (US) '94 Alto - The Box - '94 Suzuki Alto Ce-L 90 day: 39.5 mpg (US) Thanks: 14 Thanked 13 Times in 10 Posts	this might help on the speedometer calculation... http://www.miata.net/garage/tirecalc.html as far as whether or not there is benefit, it's a mixed bag of issues here, so it could help or hurt. you'll need to be more specific about the suggested alteration to determine if you'll see improvement or not. wheel weight, diameter, tire width, aspect ratio, and tire design as well will all contribute whether or not there will be benefit. and... believe it or not, many alloy wheels weigh more than their steel counterparts, so an exact wheel choice will also be needed to help determine if your new wheel is eco friend or foe. Last edited by zonker; 05-15-2011 at 06:09 PM..