31 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 runout limit Steel wheel 1.25 mm 1.25 mm Alloy wheel 0.8 mm 1.25 mm Fig. 1
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