90PSI in rears ???

[Ray,IN]

Originally Posted by gpounder

I put 90 in my rears because my coach does not weigh what the sticker says. Altogether my coach is 5,000 less than the label. Only lower the pressure if you know the weight and add a little for safety.

Low pressure causes the tire to heat and that is far more dangerous than the loss of traction an excessively hard tire might have.

I also like a smooth ride, hard tires are hard and also impact the suspension more than a tire that will absorb small impacts.

Goodyear says re: lowering pressure important "This is not only dangerous, it's relatively ineffective, as the difference in ride quality is not significant."

[gpounder]

Originally Posted by Ray,IN

Goodyear says re: lowering pressure important "This is not only dangerous, it's relatively ineffective, as the difference in ride quality is not significant."

You forgot the rest of Goodyears statement which is:
When minimum inflation pressure requirements are not met, tire durability and optimum operating conditions are compromised. Tire inflation pressure should always meet at least the minimum guidelines for vehicle weight.

The point they are making is lowering it too much is dangerous and agree. But lowering it to the right value is recommended.

[Ray,IN]

Originally Posted by gpounder

You forgot the rest of Goodyears statement which is:
When minimum inflation pressure requirements are not met, tire durability and optimum operating conditions are compromised. Tire inflation pressure should always meet at least the minimum guidelines for vehicle weight.

The point they are making is lowering it too much is dangerous and agree. But lowering it to the right value is recommended.

Did you read the entire paragraph? "Tire pressure should never be reduced below the vehicle manufacturer's recommended levels to support load conditions in order to improve the ride quality of a vehicle. The difference in ride quality is not significant. When minimum inflation pressure requirements are not met, tire durability and optimum operation can be affected."

[gpounder]

Here is better write-up specifically aimed at RVs by Michelin.
https://www.michelinb2b.com/wps/b2bc...s_Brochure.pdf

They make a point to never drive on a under or overloaded tire. I also found a second sticker for my coach that shows the unloaded weight UVW. It was very close to the CAT scale. Please notice the standard sticker says Maximum weight and the tire pressures are for Maximum weight.

In the article they use an example o to demonstrate lowering the pressure to match the load.

The moral of the store is to weigh your coach to make a informed decision on tire pressure.

quote
The most critical factor in tire maintenance is proper
inflation. Driving on any tire that does not have the
correct inflation pressure is dangerous and will cause tire
damage. Improper pressure for the weight of the vehicle
could cause premature wear, tire damage, or a harsher
ride. The correct inflation pressure allows for full tread
contact with the road surface and promotes traction,
braking capability, and handling.
An underinflated or overloaded tire will build up
more heat that could go beyond the endurance limits
of the rubber, steel belts, and radial cords. This could
cause sudden tire failure. Underinflation will cause
poor handling, faster and/or irregular tire wear, and a
reduction in fuel economy. Overinflation, on the other
hand, will reduce the tire’s contact area with the road
surface, which reduces traction, braking ability, and
handling. A tire that is overinflated for the weight it is
carrying is more prone to a harsh ride, uneven tire wear,
and impact damage.