Ford 750 2009 Owner's Manual page 217

Maintenance and Specifications
Matching
Dual Tires: Dual tires should be matched using tires of equivalent size.
Tires which differ more than 1 ⁄ inch (6 mm) in diameter or 3 ⁄ inch
4 4
(19 mm) in circumference should not be mounted on the same dual
wheel assembly.
Mixing: Never mix bias and radial tires on this vehicle. Never mix
different tire sizes or constructions on the same axle.
Rotation:
Rotation is always advisable:
1. If front (steering) axle tires become irregularly worn, move to rear
position.
2. In a dual assembly, reverse the position of the tires if one tire wears
much faster than its mate.
3. 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:
1. Front (Steering) Axle: Tires must be removed when tread is worn
to 4/32 inch (3 mm) or less. Retread or rotate worn tires to drive
position. Retreaded tires are not recommended to be used on steering
axles.
2. Rear Axles: Tires must be removed when tread is worn to 2/32 inch
(2 mm).
If rib tire is used on front axle and lug or off-road type on rear axle
positions:
1. Front (Steering) Axle: Replace tires at front wheels when tread is
worn to 4/32 inch (3 mm) or less.
2. Rear Axles: Tires must be removed when the tread is worn to
2/32 inch (2 mm) or less. Tires identified with the word "re-groovable"
molded on the sidewall can be re-grooved. A minimum of 3/32 inch
(2.5 mm) of under-tread must be left 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.
Out-of-round tires and wheel assemblies can be corrected by re-clocking
the tire relative to the wheel.
The tire and wheel assembly should then be dynamically balanced.
217
2009 F-650/750 (f67)
Supplement
USA (fus)