Unmatched tires on tandem drive units will cause tire wear and scuffing and possible
damage to the drive units. Consequently, we recommend the tires be matched to within
1/8” of the same rolling radius; 3/4” of the same rolling circumference.
Tandem units-IMPORTANT:
The four largest tires should never be installed on one driving axle or the four smallest tires
on the other driving axle. Such tire mounting will cause an inter-axle “fight”, unusually high
axle lubricant breakdown, and possible costly axle service.
In addition to matching individual tire rolling radius or rolling circumference, we recommend
matching, as nearly as possible, the total tire circumference of one driving axle to the total
circumference of the other driving axle. This will usually result in satisfactory tandem axle
lubricant temperatures that lengthen drive unit service with higher tire mileage.
T300-1_T500-1_T780
Maintenance
322 P/N 12261-683
REVISED: January 2015
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