6 MICHELIN
®
RV Tires
When using blocks to level motorhomes or
RVs, extreme caution must be taken to make
sure the tires are fully supported. The weight
on the tire should be evenly distributed on the
block. And in the case of duals, it should be
evenly distributed on blocks for both tires. If
not, the sidewall cables can become fatigued
and damaged, resulting in a sidewall rupture
and a complete, sudden loss of pressure.
Note in the correct method, the blocks
are wider than the tread and longer than the
tire’s footprint. This provides maximum
support to the tires and assures that the load
is evenly distributed.
Let’s consider an RV running on 275/80R22.5
MICHELIN
®
XZA3
®
+
EVERTREAD LRG tires, with actual
corner weights of 5,400 lbs. on the left front tire,
5,175 lbs. on the right front tire, 8,500 lbs. on the left
rear duals, and 9,200 lbs. on the right rear duals. For
control of the RV, it is critical that the tire pressures be
the same across an axle. Therefore, we must “overinflate”
the right front tire and the left rear duals. Checking the
load/inflation table below shows that a cold tire pressure
of 95 psi will support 5,510 lbs. on a single front tire.
To determine the pressure for the rear duals, again
take the heaviest position, in this instance the right rear
weighs 9,200 lbs. The load/inflation table below shows
that a cold pressure of 85 psi will support 9,380 lbs. on
2 dual tires. It is important to note that the cold inflation
pressure for the tire must never exceed the maximum
inflation rating that is stamped on the wheel.
REMEMBER: For control of the RV, it is critical that the
tire pressures are the same on both sides of an axle.
Please note that the standard MICHELIN
load/inflation charts have been altered for RV usage only.
USING BLOCKS TO LEVEL MOTORHOMES AND RVS EQUIPPED WITH RADIAL TIRES
Incorrect
One tire or only a portion of one tire is supporting the full load.
MAXIMUM LOAD
AND PRESSURE ON SIDEWALL
This chart is for RV wheel end use only.
275/80R22.5 LRG
PSI 70 75 80 85 90 95 100 105 110
kPa 480 520 550 590 620 660 690 720 760
SINGLE 4500 4725 4940 5155 5370 5510 5780 5980 6175 S 6175 LBS at 110 PSI
DUAL 8190 8600 9080 9380 9770 10140 10520 10880 11350 D 5675 LBS at 110 PSI
SINGLE 2040 2140 2240 2340 2440 2500 2620 2710 2800 S 2800 KG at 760 kPa
DUAL 3720 3900 4120 4260 4440 4600 4780 4940 5150 D 2575 KG at 760 kPa
LBS
KG
S = 1 tire on 1 side of single axle
Single Axle
D = 2 tires on 1 side of dual axle
Dual Axle
For Tag axle, use applicable
Single or Dual chart
Correct
Evenly supporting the full load.
HOW TO USE THE ACTUAL RV WEIGHT INFORMATION
WITH THE TIRE DATA LOAD CHART
To Next Page
Loading...