Originally Posted by skidoonut
you will have abs problems with mixing different size tires. the abs will think the tires are turning at different speeds. not recommended. also spare should match beacuse if you have a flat on the rear the tire size difference will be very hard on the diff. gears as the two rear tires will have to turn at different rpms. diff gets very hot when towing on the highway and added stress of two different tires is asking for trouble.
That's why I love this forum. Somebody always has the right answer.
Thanks Skidoonut and acadiabob for your input.
I looked at the specs for the tire and I failed to catch the difference in diameter. I thought the 245/265 was the width of the tread only and that the 75R was the diameter. I assumed since they were both 75R they would be the same diameter.
The other concerns are also valid and not thought of.
The logic for increasing the tire width was to increase the max rated load of the tire.
Looking closer at the specs for the 2 tires, you guys are flat on the money
. The 245 has a diameter of 30.47 inches and turns 683 revs per mile. The 265 has a diameter of 31.65 inches and turns 657 revs per mile. That is enough to really screw with the speedometer and the computer.
The only gain would be an increase in max load at 80 PSI (what I was looking at) of only 150 pounds per tire. Not enough to justify all the downside.
Thanks again everyone
Will be getting the 245s this fall.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW