17" rims and fuel economy

[MadMax]

But remember, if you add 17" wheels then you need to multiple the distance driven by 1.07 to get the exact mileage, due to the larger wheel diameter...

So when I drive an "indicated" 350 miles, in reality it is 374.5 miles...

Cheers! M2

[thebarber]

Originally Posted by MadMax

But remember, if you add 17" wheels then you need to multiple the distance driven by 1.07 to get the exact mileage, due to the larger wheel diameter...

So when I drive an "indicated" 350 miles, in reality it is 374.5 miles...

Cheers! M2

not really...its all about tire size

oem is 185-60-15

205-40-17 are within 1.23% of the oem rolling size

215-40-17 are within 0.125%

really, youre only going about 1% farther rather than 7%...

[MadMax]

Originally Posted by thebarber

not really...its all about tire size

oem is 185-60-15

205-40-17 are within 1.23% of the oem rolling size

215-40-17 are within 0.125%

really, youre only going about 1% farther rather than 7%...

My Yaris has 215/45ZR17 tires on it, and stock tires are 175/65R14s.

Go to this web site and submit those two sizes in, and you will see that the stock tire has a circumference of 72.09 inches (1831mm) whereas the larger tire I am running has a circumference of 77.31 inches (1963.6mm). That's a diameter difference of 6.75%.

Do the math and you will see the tire travels a distance of an additional 5.22 inches per rotation over the stock tire.

As the odometer is set for the stock tire, you must add the addition of 7% (rounded up) to the odometer distance traveled.

[thebarber]

Originally Posted by MadMax

My Yaris has 215/45ZR17 tires on it, and stock tires are 175/65R14s.

Go to this web site and submit those two sizes in, and you will see that the stock tire has a circumference of 72.09 inches (1831mm) whereas the larger tire I am running has a circumference of 77.31 inches (1963.6mm). That's a diameter difference of 6.75%.

Do the math and you will see the tire travels a distance of an additional 5.22 inches per rotation over the stock tire.

As the odometer is set for the stock tire, you must add the addition of 7% (rounded up) to the odometer distance traveled.

it is suggested you dont go past 3% tire size difference....just because it screws up your speedometer and odometer too much otherwise...

[MadMax]

Originally Posted by thebarber

it is suggested you dont go past 3% tire size difference....just because it screws up your speedometer and odometer too much otherwise...

I have never heard that one before, can you cite your source? Plus, if anything, that is probably a rule for stock rims, on which you can put slightly larger tires. But mine are aftermarket.

Plus, I own a Jeep, so I am very familiar with oversized wheels and tires! It is very common in the Keep community for people to put huge tires on their rigs. Besides suspension modifications, the only real requirement for larger sizes is regearing (for going from 29" tires to 35" or larger); but that is not an issue here.

The stock Yaris with an AT can easily handle 17" wheels, and you can even lower it by changing out the springs to some degree without having rubbing issues. People all over this forum have done this, and there are numerous threads about it

Cheers! M2

[thebarber]

Originally Posted by MadMax

I have never heard that one before, can you cite your source? Plus, if anything, that is probably a rule for stock rims, on which you can put slightly larger tires. But mine are aftermarket.

Plus, I own a Jeep, so I am very familiar with oversized wheels and tires! It is very common in the Keep community for people to put huge tires on their rigs. Besides suspension modifications, the only real requirement for larger sizes is regearing (for going from 29" tires to 35" or larger); but that is not an issue here.

The stock Yaris with an AT can easily handle 17" wheels, and you can even lower it by changing out the springs to some degree without having rubbing issues. People all over this forum have done this, and there are numerous threads about it

Cheers! M2

jeep is a different story though...i have a buddy on 35's....he changed the gearing in his speedo though

as for a source of that 3% rule...1010tires.com, the place you linked to goes red if you put in a size thats 3% larger than your stock tires on the tire size calculator...see:



the tires you bought are sized for a corolla.....