SAFARI

WHEELS & TYRES

III. WHEELS AND TYRES

Wheels & tyre assembly is important part in vehicle,

it affects performance of the vehicle & tyre life.

Following are the details of correct practices to be

followed :

TYRES :

This vehicle is equipped with 235/75 R15 passenger

radial tubeless tyre. The tyre is designed to operate

satisfactorily with loads upto the full rated load capacity

when inflated to the recommended inflation pressures.

It is important to maintain correct tyre pressures.

Heavy cornering, excessively rapid acceleration, and

unnecessary sharp braking increases tyre wear.

WHEELS :

Standard equipment wheels are the following steel

wheels

6.0J x 15 steel rim / 6.0J x 15 Alloy Rim

ReplacementTyres :

When replacement is necessary, the original equipment

type tyre should be used. Replacement tyres should

be of the same size, load range and construction as

those originally on the vehicle. Use of any other size

or type tyre may affect ride, handling, speedometer/

odometer calibration, vehicle ground clearance and

tyre clearance to the chassis.

It is recommended that new tyres be installed in pairs

on the same axle. If necessary to replace only one

tyre, it should be paired with the tyre having the most

tread, to equalize braking traction. Also, do not mix

different types of tyres (viz. radial, bias etc.) on the

same vehicle, because it badly affects the handling

of the vehicle. Tyre pressures is usually printed on

sticker, stuck on driver side door.

Replacement of wheels :

Wheels must be replaced if they are bent, dented,

have excessive lateral or radial runout, air leak through

welds, have elongated bolt holes, if lug nuts won't

stay tight, or if they are heavily rusted. Wheels with

greater runout than specification may cause

objectional vibrations.

Replacement wheels must be equivalent to the original

equipment wheels in load capacity, diameter, rim with

offset andmounting configuration. Awheel of improper

size or type may affect wheel and bearing life, brake

cooling, speedometer/odometer calibration, vehicle

ground clearance and tyre clearance to body and

chassis.

How to measure wheel runout :

To measure the wheel runout, it is necessary to use

an accurate dial indicator. The tyre may be on or off

the wheel. The wheel should be installed to the wheel

balancer of the like for proper measurement.

Take measurements of both lateral runout and radial

runout at both inside and outside of the rim flange.

With the dial indicator set in place securely, turn the

wheel on full revolution slowly and record every reading

of the indicator. (Fig.1)

When the measured runout exceeds the specification

and correction by the balancer adjustment is

impossible, replace the wheel. If the reading is affected

by welding, paint or scratch, it should be ignored.

Radial

Lateral

runout limit

Steel wheel

1.25 mm 1.25 mm

Alloy wheel

0.8 mm 1.25 mm

Fig. 1