Proper Tire Inflation; Cold Inflation Pressure; Underinflation; Tire Inflation Procedure Precautions - Airstream Rangeline 2023 Owner's Manual

Ram Promaster Van

Proper Tire Inflation

The level of air in your tires affects your vehicle's
overall performance� Even the highest quality tire will
perform poorly if improperly inflated. Each vehicle has
a recommended cold inflation pressure. Check the
ProMaster manual for all weights and tire information
and the placard location; also
page 4-3�
Since the touring coach's loading configurations will
vary, the load on each tire will vary� For this reason,
check air pressure based for each tire's load�

Cold Inflation Pressure

Cold tire inflation pressure is defined as the tire
pressure after the vehicle has not been driven for at
least three hours or driven less than 1 mile (1�6 km)
after sitting for a minimum of three hours. Inflation
pressure is measured in units of PSI (pounds per
square inch) or kPa (kilopascals)� Check your tire air
pressure at least once a month, before each trip, and
each morning you drive during a trip� Make sure the
valves and caps are free of dirt and moisture�

Underinflation

Underinflation increases susceptibility to damage due
to road hazards, reduces tire casing durability, and
causes a loss in fuel economy, plus uneven or irregular
tire wear. Severe underinflation increases the risk of
tread separation, handling difficulties, and possibly tire
failure caused by overheating�
NOTE
It is a common practice for motorhome owners to
lower tire pressure in their search for a smoother
ride. This is not only dangerous, it is relatively
ineffective, and the difference in ride quality is
not significant. 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.
7-4
see Specifications on

Tire Inflation Procedure Precautions

• BE SAFE - Tires run with more than a 20%
underinflation (approximate) must be dismounted
and inspected by a trained professional� Due to the
risk of explosion, it should not be inflated without a
full inspection or a safety cage� Failure to do so could
potentially result in a fatal injury�
• Use a calibrated gauge� A special gauge designed
for larger tires will be required if your tire is rated for
higher inflation pressures.
• It may be necessary to inflate your tires at a truck
stop or truck service center to achieve adequate air
pressure for your coach's needs�
• Only permanent air seal metal valve caps should be
used�
• Do not bleed air from warm tires to reduce pressure
buildup�
• Do not inflate tires to cold psi rating beyond rim
specifications.
Due to RISK OF EXPLOSION damaged tires or
tires run with more than a 20% underinflation
(approximate) must be dismounted, inspected by
a trained professional, and should not be inflated
without using a safety cage.

How Overloading Affects Your Tires

Tire pressure is what enables your touring coach tire to
support loads� Overloading your tires can have serious
consequences for passengers and your touring coach�
Too much weight can cause stress on your touring
coach's suspension system, brake failure, shock
absorber damage, handling and steering problems,
irregular tire wear, and possible tire failure� Excessive
loads or underinflation can lead to excessive heat and
tire failure� If you discover that your tires cannot handle
the load, lighten the weight of the load on your tires�
WARNING
2023 Rangeline