Bigger Rims Better MPG?
#2
Re: Bigger Rims Better MPG?
Lighter, yes.
Bigger wheels, assuming shorter tire sidewalls, would simply mean more shock travel/heating that would otherwise go into tire sidewall flex.
Otherwise simply a question of comfort.
Better to have the tire and suspension absorb the road "undulations", not the entire vehicle weight.
Bigger wheels, assuming shorter tire sidewalls, would simply mean more shock travel/heating that would otherwise go into tire sidewall flex.
Otherwise simply a question of comfort.
Better to have the tire and suspension absorb the road "undulations", not the entire vehicle weight.
#3
Re: Bigger Rims Better MPG?
Be very, very careful about going with a wider tread. This increases the rubber area exposed directly to the line of motion and can easily impact mileage. Also, there are some reports of wider tires extending out far enought to impact the edges of the wheel wells when going over bumps. This would be a very, very bad thing.
There may be some better things to do to improve your mileage than changing wheels and tires. What are you getting now and where do you want to be?
Thanks,
Bob Wilson
#5
Re: Bigger Rims Better MPG?
51 is my average, which Im very happy with, considering what most people are getting in their non-hybrids. I watch my monitor constantly so it's hard for me to think I could get any better. Is that low to some of you guys?
I was just trying to figure that -in a mile, a bigger wheel will take less rotations and a smaller wheel will be more. Thats the only thing I was going off of with the better mpg on bigger rims. Otherwise I don't know much on physics and all that...
I saw a prius with nice wheels on it and I was thinking about getting some. However I don't want to change wheels if it's going to dramatically hurt my mpg.
I have a 2008 prius -package 6 if that matters
I was just trying to figure that -in a mile, a bigger wheel will take less rotations and a smaller wheel will be more. Thats the only thing I was going off of with the better mpg on bigger rims. Otherwise I don't know much on physics and all that...
I saw a prius with nice wheels on it and I was thinking about getting some. However I don't want to change wheels if it's going to dramatically hurt my mpg.
I have a 2008 prius -package 6 if that matters
Last edited by AshieLou; 01-26-2008 at 09:04 AM.
#6
Re: Bigger Rims Better MPG?
A larger -wheel- (the aluminum part) will result in a heavier wheel/tire combo. Heavier will decrease the mileage.
While your thoughts of a large dia. wheel turning less are correct, it's the combination of the vehicle driveline design and the wheel that matters. The Prius is optimized for the overall diameter of either the 15" or the 16" combination (they both have the same overall diameter). Because the wheel weight goes up faster by diameter than the tire weight comes down due to sidewall height, the 15" combo is lighter than the 16" combo.
Now, if you wanted to drop the wheel weight to get better mileage, Volk Racing has come out with some really nice wheels for the Prius that are about 30% lighter than stock (same size). They are available in 15" and 16" sizes, 15" again being lighter.
CE28 ECO DRIVE Volk Racing Prius only Wheels
15 inch: 4.6kg (10.1 lbs)
16 inch: 4.9kg (10.8 lbs)
Toyota OEM Rim
15 inch 6.5kg (14.3 lbs)
16 inch 6.9kg (15.2 lbs)
They aren't particularly expensive compared to other good quality aftermarket wheels, at around $400 each or $1600 for a set. They also have a lot of "bling".
While your thoughts of a large dia. wheel turning less are correct, it's the combination of the vehicle driveline design and the wheel that matters. The Prius is optimized for the overall diameter of either the 15" or the 16" combination (they both have the same overall diameter). Because the wheel weight goes up faster by diameter than the tire weight comes down due to sidewall height, the 15" combo is lighter than the 16" combo.
Now, if you wanted to drop the wheel weight to get better mileage, Volk Racing has come out with some really nice wheels for the Prius that are about 30% lighter than stock (same size). They are available in 15" and 16" sizes, 15" again being lighter.
CE28 ECO DRIVE Volk Racing Prius only Wheels
15 inch: 4.6kg (10.1 lbs)
16 inch: 4.9kg (10.8 lbs)
Toyota OEM Rim
15 inch 6.5kg (14.3 lbs)
16 inch 6.9kg (15.2 lbs)
They aren't particularly expensive compared to other good quality aftermarket wheels, at around $400 each or $1600 for a set. They also have a lot of "bling".
#7
Re: Bigger Rims Better MPG?
I was just trying to figure that -in a mile, a bigger wheel will take less rotations and a smaller wheel will be more. Thats the only thing I was going off of with the better mpg on bigger rims. Otherwise I don't know much on physics and all that...
I saw a prius with nice wheels on it and I was thinking about getting some. However I don't want to change wheels if it's going to dramatically hurt my mpg.
I have a 2008 prius -package 6 if that matters
I saw a prius with nice wheels on it and I was thinking about getting some. However I don't want to change wheels if it's going to dramatically hurt my mpg.
I have a 2008 prius -package 6 if that matters
Bob Wilson
#8
Re: Bigger Rims Better MPG?
BTW; I own a 2008 Prius Touring and currently average between 45 to 49MPG.
Regards, Robert
#9
Re: Bigger Rims Better MPG?
It appears you are getting decent MPG as is. I wouldn't waste my money on a new set of rims/tires. Your biggest factor going against you now, is weight. If you want to spend money, see if you can replace some components (hood, trunk, etc) of your car with CF.