Changing rim size, changing mpg?
So im think of changing from stock 175/65/15 to 205/40/17. The tyre calculators tell me the circumference difference is -2%. what have peoples real world experiences been of changes to fuel comsumption when making the change?
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I think it boils down more to tire weight, & rolling resistance.
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In my case, i went wider 205 tire albeit (lighter then stock tire and wheel) and maintained just about the same gas mileage (maybe marginally better). Handles miles better with the wider tire too.
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wow one of the responders here REALLY answers your question in depth
http://www.wiki.answers.com/Q/Does_r...change_mileage |
Originally Posted by Madasadad
(Post 1166117)
So im think of changing from stock 175/65/15 to 205/40/17. The tyre calculators tell me the circumference difference is -2%. what have peoples real world experiences been of changes to fuel comsumption when making the change?
Difference in tire diameter if speedometer and odometer are affected. How you drive- if 205/40-17 makes you drive faster and brake more you won't get as good mpg True mpg may change due to- Weight of wheel and tire combo if drastically different than stock Higher rolling resistance of aggressive tire size- wider gives more grip but lower mpg When I want more street comfort and more mpg I use narrow wheels and all season tires and when I want performance I use 17" wheels with Extreme or Max Summer tires. The difference can be about 2-3 mpg depending on how you drive. |
Originally Posted by Madasadad
(Post 1166117)
So im think of changing from stock 175/65/15 to 205/40/17. The tyre calculators tell me the circumference difference is -2%. what have peoples real world experiences been of changes to fuel comsumption when making the change?
I went from the oem steel/hubcab rim combo 15x5.5, +55et, 175/65/15 to 17x7, +45et, 205/40/17 on my GE8 Jazz VTi. Both wheel/tire combo's weigh in @ 14.5kg The fuel consumption remained the same. Cornering Grip is better due to wider 205 tire/ 7" rim. Riding Comfort is similar as well (Kumho KU31 @ 36psi front & 34psi rear) Slightly quicker acceleration due to the smaller rolling diameter. If you want better fuel consumption, get some lightweight 15" alloys weighting in @ 5kg & below. My GE8 uses half a liter less per 100kms rolling on my other set of wheels: Mugen RNR 15x6.5 +45et, 4.7kg Hope this helps you decide :thumbups: |
The smaller wheels will likely perform better overall, big wheels are good for style points though. :)
Good article here: Effects of Upsized Wheels and Tires Tested - Tech Dept. - Car and Driver |
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