TYRE ROTATION III. To equalize wear rotate the tyres as per to the figure given below periodically. Tyre rotation is recommended for achieving identical wear on each tyre. Regular rotation of tyres will also prevent abnormal wear. The sketch indicates a suggested sequence of tyre rotation. Rotate tyre at a point specified in the service schedule. FOR 195/60 R16 • For 215 /60 R16 tyre with smaller size • temporary tyre equipped WHEEL RUN OUT IV. Wheel run - out is because of poor bead seating on the rim. Poor bead seating is usually the result of improper mounting or the use of improperly made wheels. Basically there are two types of run-out: Radial run-out: An “out-of-round” situation • where vibrations are produced as the wheel spindle moves up and down. Lateral run-out: A side-to-side or wobbling • movement of the tyre and wheel. Procedure to perform a wheel lateral and radial run out check is as given below: 1. Mount the wheel on the vehicle or wheel balancer. If on the vehicle, properly lift and support the vehicle such that wheels can turn freely. 2. Position a dial indicator on a rigid fixture. 3. For lateral run out check, position the indicator point horizontally against the side of the wheel rim flange. For a radial run out check position the indicator point vertically against the tyre mounting surface of the wheel rim flange. 4. Slowly rotate the wheel one full revolution while observing the dial indicator. 5. Rotate the wheel to the position where the lowest dial indicator reading was obtained. 6. Zero out the dial indicator. 7. Slowly rotate the wheel one full revolution while observing the dial indicator. 8. Record the highest dial indicator reading. Disregard any indicator readings caused by welds, paint runs, scratches etc. 9. Perform lateral and radial run out checks on both inboard and outboard sides of the wheel. Compare each reading with the specified 10. values (as given below) If the run out is greater than the specification, the wheel must be replaced. NOTE The tyre rotation should always be done including the spare wheel. Spare wheel can be excluded from rotation in the following conditions • If the spare wheel is damaged and not recommended for normal use. • If the spare wheel size is different from the normal tyres. Wheels and Tyres 15
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