How much difference is ok on rear R/L rear tire diameters?

[PalmSprings]

Your quote:
In reallity your outside tire is probably carrying more weight than the inside tire.

When matching two tires together with a different circumfirance I would allways put the bigger one on the inside,
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My question to the above:

Why do you choose to put the taller of the two on the inside?

You may be correct,im not disputing you.
It does raise more questions for me,which are bound to follow
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Originally Posted by slickest1

I used to run logging trucks and would match tires side by side up to an inch difference with never any ill effects. A half in difference is nothing when you consider the ruts in the roads nowadays. In reallity your outside tire is probably carrying more weight than the inside tire. If you put a chalk mark on the face of the two side by side tires bolted to the same hub and run them for several revolutions the marks will still line up. They both travel the same distance when they are bolted together. If you run them seperately then there will be a differance. When matching two tires together with a different circumfirance I would allways put the bigger one on the inside, although keeping the same sizes together is the best policy.

[PalmSprings]

PROBLEM 1
Considering the rt rear duals,all the same diameter:
RV is on a Crowned roadway,and load evenly distributed
It seems to me The inner tire is probably carrying more weight because the crowned road is actually higher under the inner than the outer tire.

The difference would be so small to be only noticible after many miles of wear.??

PROBLEM 2
An RV is on a near perfect flat surface.
Again,The rear duals are all the same height.
Weight is evenly distributed right to left.

QUESTION 2
Of the total weight on the rear tires,Generally,which tire/s carry what percentage of the weight ?
Outers or inners?

this would be helpful to know when putting on tires that are of different age,wear etc. One would want the " better "tire to have to carry the slightly greater load IMO.

[offthewall]

Originally Posted by slickest1

I used to run logging trucks and would match tires side by side up to an inch difference with never any ill effects. A half in difference is nothing when you consider the ruts in the roads nowadays. In reallity your outside tire is probably carrying more weight than the inside tire. If you put a chalk mark on the face of the two side by side tires bolted to the same hub and run them for several revolutions the marks will still line up. They both travel the same distance when they are bolted together. If you run them seperately then there will be a differance. When matching two tires together with a different circumfirance I would allways put the bigger one on the inside, although keeping the same sizes together is the best policy.

I've never run logging trucks but I assume a lot of the miles are on gravel or dirt roads. Those surfaces will allow the different diameter tires to scrub easier. Have you ever tried to turn a JEEP in 4 low on dry pavement vs. dirt or sand?

Of course the tires on the same side of the diff will rotate together, that is the problem. The smaller tire will want a couple hundred more feet to go by every mile, so it will be dragged backwards by the larger tire, wearing the tire and building up heat. In reality the actual revolutions per mile will be closer to an average between the larger and the smaller tire so both tires will be "dragged" in opposite directions. The closer to zero difference in ht. between the tires, the less those forces will be. At some point it's going to be bad. I'd try to keep them as close as possible.

[slickest1]

I guess it could be argued that when running down the road with ruts as most roads have, the road could be higher to the inside or the outside. I allways would put the higher tire on the inside and never had any problems. In reallity it could be on the outside as well. The only point I was makeing was on most road surfaces nowadays a 1/2 in difference in tire height is not a big deal.