Issue link: http://read.dmtmag.com/i/34501
MICHELIN X ONE TIRE AIR PRESSURE MAINTENANCE PRACTICES ® ® Tire pressure maintenance advice for users of the new MICHELIN ® X One wide single truck tires (445/50R22.5 ® LRL and 455/55R22.5 LRL). Proper air pressure maintenance is critical to obtain optimized performance from these tires. Due to the unique casing design of the MICHELIN ® X One tire, ® traditional air pressure adjustment practices for dual tires may not apply to MICHELIN ® X One tires. ® Cold inflation pressure should be based on maximum axle load in daily operation. Cold inflation pressures must not be lower than indicated in the tables below for actual axle loads. For additional information, please consult the MICHELIN ® Truck Tire Data Book (MWL40731). A 10 psi incremental change in tire inflation will alleviate most wear forms derived from vehicle anomalies, driver influence, and/or application. Always refer to actual axle loads to determine the initial recommended cold inflation pressure. For example, load range L (20 ply) tires like the 445/50R22.5 MICHELIN X One ® XDA tires have a ® maximum air pressure of 120 psi (cold) with a weight carrying capacity of 20,400 lbs. per axle. If the tire is mounted on a vehicle carrying 17,480 lbs. per axle, the appropriate air pressure is 100 psi (cold). For trailers equipped with an air pressure monitoring system, system pressure should be regulated based on the maximum load the axle will carry and be at the cold equivalent for this load. When an aluminum wheel is used in the outset position, a TR543E or the new TR553E valve can be used. It is recommended that you verify air valve stem torque on WHEEL DIAMETER 22.5" 445/50R22.5 LRL X One XDA, X One XDA-HT Plus, X One XDN2, X One XTA, X One XTE 455/55R22.5 LRL X One XDA-HT Plus, X One XDN2, X One XTE PSI kPa 75 520 80 550 85 590 90 620 95 660 100 690 all wheels put into service. When installed, they should have correct torque, using the proper tool at 80 to 125 in./lbs. (7 to 11 ft./lbs.) for aluminum wheels and 35 to 55 in./lbs. (3 to 5 ft./lbs.) for steel wheels. To check for slow leaks at the valve stem, use either a torque wrench by hand or spray a soapy solution on the valve to see if it is loose. To prevent galvanic corrosion on aluminum wheels, lubricate the threads and o-ring of the valve stem with a non-waterbased lubricant before installation. Single tire fitments have proven themselves in numerous North American applications and are expected to grow in popularity with fleets. Single tires are, of course, the norm on steer axles, and are proven, valid solutions on trailers and on driven axles of tandem axle (6x4) tractors. However, recent handling studies indicate that for certain types of commercial single axle (4x2) tractors pulling trailers, the vehicle dynamics are such that handling may be degraded in the event of a tire failure when fitted with singles. No other vehicle types or wheel positions have shown any enhanced handling issues with single tires. In the interest of caution, Michelin recommends that single axle (4x2) tractors fitted with MICHELIN ® X One tires on ® the driven axles always be equipped with an Electronic Stability Program (ESP). Without an ESP on the 4x2 tractor, four tires are recommended across the driven axle rather than two tires. Once again, no other vehicle types are affected by this recommendation. Please note: This does not change Michelin’s long-standing position that all types of motor vehicles can be controlled in the event of a rapid air loss under normal, legal driving conditions. Michelin maintains that vehicle control in rapid air loss situations is a matter of driver education and training. 105 720 110 760 115 790 120 830 LBS SINGLE 13880 14620 15360 16060 16780 17480 18180 18740 19560 20400 125 860 130 900 MAXIMUM LOAD AND PRESSURE ON SIDEWALL S 10200 LBS AT 120 PSI KG SINGLE 6300 6640 6960 7280 7620 7940 8240 8500 8860 9250 LBS SINGLE 15000 15800 16580 17360 18120 18880 19640 20400 21200 22000 KG SINGLE 6800 7160 7520 7880 8220 8560 8900 9250 9580 10000 455/55R22.5 LRM LBS SINGLE X One XZU S, X One XZY3 KG SINGLE With chip and cut resistant tread compound. 64 Section Four: MICHELIN X One Tires ® ® S 4625 KG AT 830 kPa S 11000 LBS AT 120 PSI S 5000 KG AT 830 kPa 16580 17360 18120 18880 19640 20400 21200 22000 22600 23400 S 11700 LBS AT 130 PSI 7520 7880 8220 8560 8900 9250 9580 10000 10240 10600 S 5300 KG AT 900 kPa