Issue link: http://read.dmtmag.com/i/34501
CHAINS ‡ Specific chains are available for the MICHELIN X One ® ® tire product line. Consult Michelin or your chain supplier for proper type/size. 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 top 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 ® XDN 2 tire (515 Tire Revs./Mile), ® ® 2 tire (511 Tire Revs./Mile) and change to a 445/50R22.5 MICHELIN X One 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. MICHELIN X One Tire Size 445/50R22.5 Dual Size ‡ The information provided is for reference only. Chains-specific questions should be directed to the chains manufacturer. 275/80R22.5 MICHELIN X One Tire Size 455/55R22.5 Dual Size 11R22.5 or 275/80R24.5 For additional information about MICHELIN ® X One Tires, ® refer to the MICHELIN X One Truck Tire Service Manual (MWL43101). ® ® MICHELIN X One Tire Tire Revs./Mile 515 (X One XDN2) Dual Tire Revs./Mile 511 (XDN2) MICHELIN X One Tire Tire Revs./Mile 492 (X One XDN2) Dual Tire Revs./Mile 496 (XDN2) * Exceeding the legal speed limit is neither recommended nor endorsed. Section Four: MICHELIN X One Tires 69 ® ®