Issue link: http://read.dmtmag.com/i/34501
TREAD SELECTION MATRIX In view of the above, it would seem best to adopt the casing management pattern below for tires in highway service: Tire First Position of First Subsequent Used On Retread Use Steer Drive or Trailer Trailer Drive Trailer Trailer Trailer Drive or Trailer Trailer Position of Retread Use RETREAD RECOMMENDATIONS 1. Follow the retread manufacturer’s recommendations. 2. Use the preferred tread size. 3. Buff to the correct crown radius. 4. Use pilot skives to measure undertread; 2⁄32" to 3⁄ 32" is all that should remain when buffing is complete. PREVIOUS SERVICE LIFE In light of all these conditions and recommendations, the purchaser of casings for retreading should proceed with caution. Use the tread selection matrix when previous service life is unknown. COLD CLIMATE PRESSURE CORRECTION DATA Because the air pressure inside a tire will decrease when the vehicle is taken from a warm environment to a cold one, some adjustments may be necessary when adjusting the tire pressures of a vehicle to be operated in very cold temperatures. These adjustments are only necessary if the pressures are verified and adjusted inside a heated garage with an air supply that is also at the higher room temperature. (No adjustment necessary if done outside.) In extreme cases, the following table should be used to ensure that the operating pressure and deflection of tires are adequate at the outside ambient temperature. Using the load and pressure charts below, determine the appropriate “Recommended Pressure” required for the axle load. Then find the same pressure down the left column of the table to the right. Going across to the relevant outside ambient temperature you will find the corrected inflation pressure to be used. For example: • A log truck in Alaska has a front axle loaded weight of 12,000 lbs. • The truck is equipped with 11R24.5 MICHELIN XZY 3 tires. ® • The recommended pressure for this fitment is 105. • The truck is parked overnight in a heated garage. • The outside high forecasted for today is -20º F. • The tire pressures are checked and adjusted prior to leaving the heated garage. According the chart below, the tires should be adjusted to 128. Adjusted Inflation Pressure (psi) when inflating indoors at 65°F [18°C] Recommended Pressure (psi) 75 80 85 90 95 100 105 110 115 120 125 130 F° 50° C° 10° 78 83 88 93 98 103 109 114 119 124 129 134 40° 4° 80 85 90 95 101 106 111 116 122 127 132 137 30° -1° 81 87 92 98 103 108 114 119 124 130 135 140 20° -7° 83 89 94 100 105 111 116 122 127 133 138 144 * Never exceed the rim manufacture’s maximum air pressure limitation. Section Nine: Appendix 123 Outside Ambient Temperature 10° 0° -12° 86 91 97 102 108 113 119 125 130 136 141 147 -18° 88 93 99 105 111 116 122 128 133 139 145 150 -10° -23° 90 96 102 108 113 119 125 131 137 143 148 154 -20° -29° 92 98 104 110 116 122 128 134 140 146 152 158 -30° -34° 95 101 107 113 119 125 132 138 144 150 156 162 -40° -40° 98 104 110 116 123 129 135 141 148 154 160 166 -50° -46° 100 107 113 119 126 132 139 145 151 158 164 171 ®