Difference between P225x75R15 and P235x75R15 on SUV

225 & 235 are section widths, not tread width. Try to keep the tread width about the same as the wheel width. Measure the wheel bead to bead width then look up tables that list acceptable section widths for that wheel. Or, ask the tire place.

Wouldn't changing require different wheels? Why not go with the size you already have?

For this use, None. The only thing that would be different is that the

235 tire is about 1/2 inch in diameter larger. The speedometer will read slower than actual speed.

Specification Sidewall Radius Diameter Circumference Difference

225/75-15 6.6in 14.1in 28.3in 88.9in 0% 235/75-15 6.9in 14.4in 28.9in 90.7in 2.1%

Chet Kincaid wrote in news:WIydnc9K27flqPrKnZ2dnUU7- snipped-for-privacy@earthlink.com:

That's not enough of a difference in width to require different wheels.

7.5 mm difference in hight (rolling diameter). It will make the speedo read just a tiny bit low. The difference in treadlife (increase) and traction (increase) will be so small as to be virtually undetectible by the driver.

unless there is a clearance problem, a 235 will fit the same wheel as the 225. Only 10mm width difference, and 7.5mm diameter - or3.75mm standing height. I have 235 winter tires and 225 summer tires on my pickup

No.

Some sizes are more readily available or cheaper.

Which is cheapest or is available in the brand/style you want? Like others have said there isn't enough difference to matter.

Chet Kincaid auf Sun, 19 Jun 2016 19:14:48 -0500 geschrieben ...

It's only a few millimeters. The wheels are the same for both widths.

Steve W. auf Sun, 19 Jun 2016 20:44:05 -0400 geschrieben ...

Are you sure about the half inch diameter difference? Someone else calculated 7.5mm diameter - or3.75mm in ride height.

There are 25.4 mm in an inch, so half an inch would be more than a dozen millimeters, which isn't what the other guy said on diameter.

clare auf Sun, 19 Jun 2016 21:15:26 -0400 geschrieben ...

Someone calculated the ride height to be half that 7.5mm, which is even a smaller difference.

The spare is the larger size, so, I guess the only difference might be when the spare is put on.

Would the extra 10mm width (and about 3.75mm in height) matter when the spare is being used?

a basic understanding of tire numbering The 225 or 235 is the tire section width in mm. the 75 (or 70, or

60, or 55) is the aspect ratio - the decimal fraction of the section width that represents the tire hieght.

I DID make an error - the sidewall hight changes by 7.5 mm - so the diameter changes by 15mm - pretty close to 0 .6 inch.

My bad.

Only with posi on clean dry pavement. - possibly. - with the spare on the drive axle.

clare auf Sun, 19 Jun 2016 22:56:46 -0400 geschrieben ...

How it tire section different than tread width? Someone said they're different. I never used the term "tire section", but, I always thought the

225 or 235 was the width of the tire on the road, which, to me, is the tread width.

Is there a difference between tread width and tire section?

Thanks for confirming the strange math where the height of the tire is listed as an inch percentage of the mm "tire section" width.

So the ride height is a bit more than half an inch difference. That's small (unless the spare is being used, where the spare is the larger width).

Not noticeable. It's a long story but I run 14" studded tires in the winter, 15" street tires in the summer. The ride height is different and the speedometer is off by about 10% but there are no other problems. I use the GPS speed rather than the speedometer and that is correct.

Google. Internet.

Henning Schr?der wrote in news:nk7klt$7n4$1 @news.mixmin.net:

That's incorrect. It should be 7.5mm radius = 15mm diameter = 47mm circumference

47mm = 1.85 inches.

The other guy is wrong. It should be radius, not diameter.

Yes. The section width is measured from sidewall to sidewall. Depending on design and application the tread with itself will be different.

Use the manufacturer-recommended OEM size. Check the door sticker, owner's manual, or call the car dealer.

The vehicle is 12 yeas old, plus you didn't say if the LOL was the original owner. So the current tires are unlikely the original ones and may not be the OEM size