Just discovered my Tires are not stock size. Problem?

[geosnooker2000]

Does having 265s instead of the stock 255 70R16s have a negative effect on the transmission? ('96 EB 4X4 V6) Probably not - just checking. I've had a bunch of durability issues with my tranny. Like not lasting as long as it should after 2 rebuilds in a row.

 

[Curtis]

You dont mention what the exact size of the new tires are, but a little taller tire should not be an issue. (except that you'll be traveling a little faster than your speedo reads)

My Father has had a 1991, 1996 and now a 2003 explorers with a plow, and transmission failure on the 1991. Likely due to the forward/backup repetitive motion of plowing. All 3 trucks have a little larger tires than stock.

 

[geosnooker2000]

The tires I have run (out of ignorance) for the whole time I have owned the '96 are 265 70r16s. I just found out that the correct size is 255 70r16s. My speedo has always read about 1 or 2 mph faster than actual clocked speeds by roadside sheriff's department equipment, AND my GPS. Eg, my speedo says 65mph. The GPS says 63mph. It seems to me that if I go back down to the 255s, it will even be further off.

The 255s are about $50 cheaper for 4 tires, which is good. BUT I like the look it has had at the taller stance/fuller wheel wells. 7mm taller (radius) @ 265 = .7cm = +/- 5/16" x 2 = 5/8" bigger diameter, or a little over 1/2". Not that big of a difference (but the eye notices differences you would not believe). Plus if there is any chance this is detrimental to my transmission, I think it's not worth the risk.

Opinions PLEASE!!!!!

 

[XLT]

Your transmission should be fine. There are guys on here running tires 4+ inches over stock diameter who are without problems. I would not even worry about it.

 

[sport97]

Yeah, I would be more concerned with the quality of rebuild your transmission is getting.

 

[koda2000]

should have no adverse effect on your transmission. your speedo might be off slightly but not by much (they're never spot-on anyway). most important for handling and abs system is that all 4 be the same size. if you have awd, it's very critical.

 

[geosnooker2000]

should have no adverse effect on your transmission. your speedo might be off slightly but not by much (they're never spot-on anyway). most important for handling and abs system is that all 4 be the same size. if you have awd, it's very critical.

Nope, I've got the V6.

Thanks guys.

 

[SoNic67]

The fist number is not the height, is the width.

Following the letter(s) that identify the type of vehicle and/or type of service for which the tire was designed, the three-digit numeric portion identifies the tire's "Section Width" (cross section) in millimeters.
P225/50R16 91S The 225 indicates this tire is 225 millimeters across from the widest point of its outer sidewall to the widest point of its inner sidewall when mounted and measured on a specified width wheel. This measurement is also referred to as the tire's section width. Because many people think of measurements in inches, the 225mm can be converted to inches by dividing the section width in millimeters by 25.4 (the number of millimeters per inch).
225mm / 25.4 = 8.86"

Sure, if the second number is identical, that will mean the aspect ratio is identical and the wider tire will be taller too.

Typically following the three digits identifying the tire's Section Width in millimeters is a two-digit number that identifies the tire's profile or aspect ratio.
P225/50R16 91S
The 50 indicates that this tire size's sidewall height (from rim to tread) is 50% of its section width. The measurement is the tire's section height, and also referred to as the tire's series, profile or aspect ratio. The higher the number, the taller the sidewall; the lower the number, the lower the sidewall.

 

[geosnooker2000]

The fist number is not the height, is the width.

Sure, if the second number is identical, that will mean the aspect ratio is identical and the wider tire will be taller too.

If you'll review my calculations in post #3, you'll see I understand all of this.

 

[SoNic67]

Now I see that you said "7mm on radius" - but did not mentioned where it came from. I thought that you meant that difference is straight in height.
Sorry.