Yires Finally On
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Junior User
Joined: Sep 2003
Posts: 57
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From: Virginia
Yires Finally On
Okay folks. the suspension lift went okay. we had to manufacture 2 drop down brackets. also the kit did not come with a pitman arm so we were glad that a local performance shop has it in stock. we had to replace the outter tie rod ends as well on both sides. so the truck is looking great. i bought my new rims and slaped on the tires.
CAN ANY ONE TELL ME THE DIFFERENCE betwen 31x10.5x15 versuse 265x75x15? the guy says they are the same size but i just want to make sure. Thank you
CAN ANY ONE TELL ME THE DIFFERENCE betwen 31x10.5x15 versuse 265x75x15? the guy says they are the same size but i just want to make sure. Thank you
Junior User
Joined: May 2003
Posts: 99
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From: Bay Area, West Coast
Load ratings (rated by letters) can be different. Also there can be P265/75x15 and LT265/75x15. The "P" stands for Passenger vehicle, while the "LT" is for Light Truck. The latter will usually have a higher Load Rating and be a stiffer (riding) tire. The standard "truck" sizes ('30x9.5x15' or'31x10.5x15') are almost always built for heavier-duty use.
Senior User
Joined: Jan 2002
Posts: 149
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From: Monument, CO
If you want the mathematical answer, read on. If you were looking for H-O-4WD's practical answer, don't bother reading any further.
As far as the size difference, the metric designations are WIDTH (in mm) / PROFILE (as % of width) / RIM DIAMETER (in inches).
So the 265/75/15 are 10.4 inches wide (265mm divided by 25.4 mm per inch) with a 7.8 inch profile (75% of 10.4 inches). Add the rim diameter (15 inches) to twice the profile and you get 30.6 inches diameter (15 + 7.8 + 7.8).
So the nominal size of the 265/75/15 is 30.6 inches x 10.4 inches. That's the same as a nominal 31 x 10.5. (All the numbers are rounded off anyway, so 30.6 is essentially equal to 31.)
Lesson over, back to work.
As far as the size difference, the metric designations are WIDTH (in mm) / PROFILE (as % of width) / RIM DIAMETER (in inches).
So the 265/75/15 are 10.4 inches wide (265mm divided by 25.4 mm per inch) with a 7.8 inch profile (75% of 10.4 inches). Add the rim diameter (15 inches) to twice the profile and you get 30.6 inches diameter (15 + 7.8 + 7.8).
So the nominal size of the 265/75/15 is 30.6 inches x 10.4 inches. That's the same as a nominal 31 x 10.5. (All the numbers are rounded off anyway, so 30.6 is essentially equal to 31.)
Lesson over, back to work.
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