Pickup (tire size) question

[Youare]

That gas milage is about right for that truck. My mother had the same set up and that is in the range of what she got for milage.

As far as the difference in gas milage between the 225 and the 215 width tires there may be a slight difference depending on the tread style on the tire. A more aggressive tread increases the rolling resistance of a tire. The narrower tire will have less rolling resistance when fully inflated if both tread patterns are the same. The narrower tire will give you better traction in some cases unless the ground is soft like sand or mud where the wider tire will floatation.

The more the tread wears off a tire the better the gas milage will be.

I just got a new set of tires for my Tacoma which came with 225R75-15's. The tire store tried to talk me into 235R75-15's saying there were a more popular tire used on SUV's. The wider tires take more fuel to turn and give less traction in the snow. A man I work with had wider tires on a
Toyota T-100 and he said that in the snow the truck was all over the place in the slush.

Randy

 

[cp1969]

The more the tread wears off a tire the better the gas milage will be.

I wonder if this is not due to odometer error. The smaller dia. a tire gets, the more miles it will record on the odometer. The truck's not actually getting better mileage; it just appears to be because the odometer is racking up more miles per tank.

 

[BTDT]

I think when Dakota's first came out, they sold them with larger tires to get them a 1/2 ton rating (marketing ploy).

 

[Boomerang1]

215 R 75 15
Sidewall: 6.3"
Radius: 13.8"
Diameter: 27.7"
Circumference: 87"
Revs/mile: 728

255 R 70 15
Sidewall: 7"
Radius: 14.5"
Diameter: 29.1"
Circumference: 91.3"
Revs/mile: 694

Where do you get a width of 6.3" from a 215 tire? and 7" width from a 255?
215 is the width in millimeters. 215 mil. = 8.471" and 255 mil = 10.047"
The actual dimensions for the 215 X 75 - 15 is 8.471 wide X 27.7065 tall.
The 255 X 70 - 15 is 10.047 wide x 29.0658 tall. In my first post, I rounded off the numbers to make it easier to figure the numbers.
P.S. Millimeters X .0394 = inches.

 

[Dmace]

Where do you get a width of 6.3" from a 215 tire? and 7" width from a 255?

SIDEWALL buddy, that means the distance from the rim to the top of the tread. I know what the width is and those numbers aren't listed.

 

[billbill1]

Thanks for the input guys, I won't change out the tires before they are worn out. I just wondered if changing would get me a couple of more mpg which wouldn't take too long to pay for them.

 

[KICK]

Toyo Recommender



this page tells you what will fit certain vehicles etc...

generally one size up wont hurt a thing

 

[jayhaitch]

LT215/75R-15=

LT=light truck P=passenger car

215mm in tread width (the width of tread touching the ground)

75=75%=aspect ratio= the ratio of the sidewall height to the tread. Put a yardstick against your wheel/tire, measure the vertical distance from the top tread (not the squished part against the ground) to where the wheel rim starts. Divide this by the tread width=aspect ratio.

R=radial

15=wheel rim diameter in inches.

So how tall is this tire? 75% of 215=161.25. Multiply this by 2 as there are 2 sidewall parts to the vertical measurement. Add the wheel diam.

161.25mm=16.125cm x2=32.25cm. 2.54cm/inch. 32.25/2.54=12.7inches. 12.7+15=27.7 inches tall.

 

[billbill1]

I read the inside of the door but didn't look closely at the tires, the tires on my pickup are 255 70R 16 and it second option for my truck is 255 65R 16. I guess it's not as far off as I thought. Thank you for the help. The door does say 215 75R 15