Issue link: https://read.dmtmag.com/i/34500
SELECTING A TIRE EQUIVALENT MICHELIN X ONE SIZES When retrofitting MICHELIN X One tires of equivalent ® ® ® size, changing engine computer revolutions per minute (RPM) should be all that is required. Consult your equipment manufacturer and Michelin representative for details if you are retrofitting other than equivalent sizes. TIRE REVOLUTIONS PER MILE AND RETROFITS TO MICHELIN ® ® X ONE TIRES Gear Ratio: A change in tire dimension will result in a change in engine RPM at a set cruise speed* that will result in a change in speed and fuel economy. The effect of tire size change on gear ratio should be considered in individual operations. A decrease in tire radius will increase tractive torque and increase indicated speed. An increase in tire radius will reduce tractive torque and decrease indicated speed. Tire Revs./Mile – Speed – Size: These factors can affect engine RPM if corresponding changes are not made to engine ratios. Example: Going from larger diameter tire to smaller diameter tire. If you currently run a 275/80R22.5 MICHELIN XDN ® 2 tire (511 Tire Revs./Mile) and change to a 445/50R22.5 MICHELIN X One ® XDN 2 tire (515 Tire Revs./Mile), ® the speedometer will indicate a slightly higher speed than the actual speed the vehicle is traveling. Final Tire Revs./Mile – Initial Tire Revs./Mile = Initial Tire Revs./Mile 515 - 511 = 0.0078 or .78% (< 1% change) 511 So when your actual speed is 60 mph, your speedometer will read 60.47 mph. TIRE MARKINGS/LOAD RANGES/ISO/DOT DESCRIPTIONS Size Design 445/50R22.5 X One XDA X One XDN 2 X One XRV X One XTE X One XTA ® ® ® ® ® ® ® ® ® ® 455/55R22.5 X One XDN 2 X One XTE X One XZU S X One XZY 3 ® ® ® ® ® ® LI/Ply Rating L/20 L/20 L/20 L/20 L/20 L/20 L/20 M/22 M/22 ISO Load Plant DOT Tire Size Optional Code MICHELIN Manufacture Date ® MICHELIN X One Tire Size ® ® MICHELIN X One Tire Revs./Mile ® ® Dual Size 11R22.5 or 275/80R24.5 Dual Tire Revs./Mile 445/50R22.5 515 (X One XDN2) 275/80R22.5 511 (XDN2) 455/55R22.5 492 (X One XDN2) 495 (XDN2) DOT SIDEWALL MARKINGS All new tires sold in the United States must have a DOT (Department of Transportation) number cured into the lower sidewall. All retreaded tires must also have an additional DOT branded into the sidewall. It is recommended that the retread DOT be placed in the lower sidewall near the original DOT code. Certain states may require labeling in addition to the Federal requirements certifying compliance with the Industry Standard for Retreading. Tires manufactured prior to the year 2000 end with 3 digits rather than 4, the first two numbers indicating the week and the last one indicating the year of production, followed by a solid triangle to indicate the decade of 1990s. Tires made or retreaded after the year 1999 will end with a four-digit code: the first two indicate the week, and the last two indicate the year of manufacture. Example: DOT B6 D0 AXL X 2006 New tire markings required by the Department of Transportation: ISO Speed 161 (10,200 lbs) L (75 mph) 161 (10,200 lbs) L (75 mph) 161 (10,200 lbs) L (75 mph) 161 (10,200 lbs) L (75 mph) 161 (10,200 lbs) L (75 mph) 164 (11,000 lbs) L (75 mph) 164 (11,000 lbs) L (75 mph) 166 (11,700 lbs) M (75 mph) 166 (11,700 lbs) M (75 mph) Indicates a cut and chip resistance tread compound for more aggressive environments. * Exceeding the legal speed limit is neither recommended nor endorsed. ** The weights are estimates only. The actual weight may vary. 2 Tire and Wheel Nomenclature Approximate Weight** 177 182 164 164 161 201 182 198 202