Issue link: http://read.dmtmag.com/i/34501
HOW TO USE THE ACTUAL RV WEIGHT INFORMATION WITH THE TIRE DATA LOAD CHART Let’s consider an RV running on 275/80R22.5 MICHELIN ® ® XZA2 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 air 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 This chart is for RV wheel end use only. 275/80R22.5 LRG PSI kPa LBS KG 70 75 80 85 90 95 100 105 110 480 520 550 590 620 660 690 720 760 MAXIMUM LOAD AND PRESSURE ON SIDEWALL 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 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. S = 1 tire on 1 side Single Axle of single axle D = 2 tires on 1 side Dual Axle of dual axle For Tag axle, use applicable Single or Dual chart USING BLOCKS TO LEVEL MOTORHOMES AND RVS EQUIPPED WITH RADIAL TIRES When using blocks to level motorhomes or Correct 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 air 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. Evenly supporting the full load. One tire or only a portion of one tire is supporting the full load. Incorrect Section Five: MICHELIN RV Tires 77 ®