Dual Tire Info Needed

Place BOTH tires on the right side of the vehicle. With the crown in the road the coach will set level with the new tires on the right side. I drove for a trucking company and this is what they did all the time.

If it helps,FMCA Mich Nat discount for XZA2's are $638.00+$40 for hwy tax, so $678 each vs $880 quoted at one dealer. You still will have to pay straight out for any mounting/valving/balancing/discard of old. I found $50 each tire and headed there next week.

NEVER –NEVER put two different size tires on a pair of duals!! The same goes for new tires of the same size from different manufactures as they will not necessary be the same Diameter.

I'm no tire expert, but I would think there is no good option for replacing two of the four rear tires. I would wait and buy four when the budget allows. Any slight difference in circumference would probably make the rear end yaw or crab.

I would pick the two best rear tires and mount them on the left rear and mount the two new tires on the right rear. Save one of the old tires for a spare.

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Why not put the money for the two new tires in a jar on the fridge and then next year buy all four at the same time?

Optimally, the best matched tires are two brand new tires of the same make, model and size with exactly the same air pressure. It is acceptable to have multiple tread designs and brands across an axle as long as the dual matching tolerance is 1/4 inch in diameter. I would put the two new ones together, and have the tire shop measure the circumference of the remaining old tires and put the best two side by side. Trucking company I retired from always measured their tires before installing them. It was not unusual for them to measure 5 tires before finding a mate to the tire that was already mounted on the rig. Tires that have not been properly matched by size and/or inflation have the same effect on tire life as low inflation or overload.

The two new drive tires must be together on the same side. The OP is planning otherwise!

unkledaddy wrote:
I have two almost new steer tires (12-12) and am planning to replace two more tires on the rear this year, and the remaining two next year. I'm aware that the two new tires will be a different circumference than the old duals I'm replacing so I need to know the tolerance. I'm planning to put one new tire on each side (both inner or outer) if possible to keep things balanced out. I can call a tire manufacturer or dealer but they might tell me I need all four duals replaced at once. LOL

Does anyone know the tolerance for tire circumferences of 295/80/22.5 of dual tires on a motorhome?


Thanks in advance.

I can't tell you the tire circumferences but you are correct to put both new tires side by side on the same side of your coach! If you were to split the tires (one new tire on each side) it would wear the new tires slowly down. Good Luck