Tire Pressure - Tiffin Motorhomes Allegro Bus 2016 Owner's Manual

ROUTINE MAINTENANCE
Tread rib—A tread section running circumferentially around a tire.
Tread separation—Pulling away of the tread from the tire carcass.
Treadwear indicators (TWI)—The projections within the principal grooves designed to give a visu-
al indication of the degrees of wear of the tread.
Vehicle capacity weight—The rated cargo and luggage load plus 68 kilograms (150 lbs.) times the
vehicle's designated seating capacity.
Vehicle maximum load on the tire—The load on an individual tire that is determined by distribut-
ing to each axle its share of the maximum loaded vehicle weight and dividing by two.
Vehicle normal load on the tire—The load on an individual tire that is determined by distributing
to each axle its share of the curb weight, accessory weight, and normal occupant weight (distributed
in accordance with Table I of CFR 49 571.110) and dividing by 2.
Weather side—The surface area of the rim not covered by the inflated tire.
Wheel center member—In the case of a non-pneumatic tire assembly incorporating a wheel, a
mechanical device which attached, either integrally or separably, to the non-pneumatic rim and pro-
vides the connection between the non-pneumatic rim and the vehicle; or, in the case of a non-pneu-
matic tire assembly not incorporating a wheel, a mechanical device which attaches, either integrally
or separably, to the non-pneumatic tire and provides the connection between tire and the vehicle.

TIRE PRESSURE

Correct tire inflation pressure is essential to maximizing the life of the tires and assuring the safety
of the vehicle and its occupants. Driving with tires that are not correctly inflated for the load of the
motorhome is dangerous and may cause premature wear, tire damage, and/or loss of control of the
motorhome.
An underinflated tire will build up excessive heat that may actually approach the vulcanization tem-
perature of the rubber and lead to tread separation and/or disintegration of the tire.
Underinflated tires will also cause poor handling of the motorhome, rapid and/or irregular tire wear,
and an increase in rolling resistance of the motorhome which, in turn, produces a decrease in fuel
economy of operation.
An overinflated tire will reduce the tire's "footprint" (i.e., its actual contact with the road); thus, re-
ducing the traction, braking capacity, and handling of the motorhome. A tire that is over-inflated for
the load that it is carrying will also contribute to a harsh ride, uneven tire wear, and the tire itself will
be more susceptible to impact damage.
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