Rotation:
Rotation is always advisable:
• If there is irregular wear on the front (steering) axle tires, move to
rear position.
• In a dual assembly, reverse the position of the tires if one tire wears
much faster than its mate does.
• On the drive axle, if heel and toe wear or alternate lug wear occurs,
rotating the tires from one end of the axle to the other end of the
axle may help even out this wear.
Rotation may not advisable:
• Front (Steering) Axle: Remove tires when tread wears down to
four–thirty seconds inch (3 millimeters) or less. Retread or rotate
worn tires to drive position. We do not recommend using retreaded
tires on steering axles.
• Rear Axles: Remove tires when tread wears down to two–thirty
seconds inch (2 millimeters).
If using a rib tire on front axle and lug or off-road type on rear axle
positions:
• Front (Steering) Axle: Replace tires at front wheels when tread is
worn to four–thirty seconds inch (3 millimeters) or less.
• Rear Axles: Remove tires when the tread wears down to two–thirty
seconds inch (2 millimeters) or less. Tires identified with the word
re-groovable molded on the sidewall can be re-grooved. There must
be a minimum of three–thirty seconds inch (2.5 millimeters) of
under-tread at the bottom of the grooves.
Wheel and Tire Balancing
Out-of-round or out-of-balance wheels or tires can cause vehicle
vibration, bounce and shimmy. Replace damaged or out-of-round wheels.
You can correct out-of-round tires and wheel assemblies by re-clocking
the tire relative to the wheel.
You should then dynamically balance the tire and wheel assembly.
Tire Wear
Radial tires can exhibit three types of normal wear patterns:
• Even
• Erosion
• Chamfer
248 Wheels and Tires
2015 F-650/750 (f67)
Owners Guide gf, 2nd Printing, April 2014
USA (fus)
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