Dual Tires Matching; Dual Tires Mixing; Rotation; Rotation Is Advisable - IC Bus CE Series Operation And Maintenance Manual

Dual Tires Matching

Dual tires should be matched using tires of equivalent size. Tires
that differ more than 6 mm (1/4 in) in diameter or 19 mm (3/4 in)
in circumference should not be mounted on the same dual wheel
assembly.

Dual Tires Mixing

NOTE: Never mix bias and radial tires on this vehicle.
It is recommended for best overall performance that only radial
tires be used on this vehicle.
Never mix different tire sizes or constructions on the same axle.

Rotation

• Steer tires that have developed some type of irregular wear
pattern can be rotated to drive axles if rib tires are being used
on all wheel positions. Applying steer tires to a drive position
will often wear off the irregularities, and they can be moved
back to the steer axles or run out to retread stage on the rear
axle.
• Another rotation possibility for fleets with rib tires in all wheel
positions is to break in the new steer tires in the drive axle
positions, then move them to steer axles. This will wear
away tread rubber relatively quick in the early life of a tire
when it is most likely to develop an unusual wear pattern.
• Drive axle tires may be placed on the other end of the same
axle so that direction of rotation is reversed. This is often
helpful if a heel and toe or alternate wheel nut wear pattern
has developed.

Rotation Is 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 wheel
nut wear occurs, rotating the tires from one end of the
axle to the other end of the axle may help even out this
wear.

Tire Replacement

NOTE: Retread tires are not recommended for use on
steering axles of trucks.
• Front (Steering) Axle– Tires must be removed when
tread is worn to 3 mm (4/32 in) or less. Retread or rotate
worn tires to drive position.
• Rear Axles– Tires must be removed when tread is worn
to 2 mm (2/32 in).
If rib tire is used 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 3 mm (4/32 in) or less.
• Rear Axles– Tires must be removed when the tread is
worn to 2 mm (2/32 in) or less. Tires identified with the
word REGROOVABLE molded on the sidewall can be
regrooved. A minimum of 2.38 mm (3/32) of undertread
must be left at the bottom of the grooves.
Maintenance
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