Cruze

Tyre and Wheel Assembly Runout Measurement — Off Vehicle

1. Raise and support the vehicle.
2. Mark the location of the wheels to the wheel studs and mark the specific vehicle position on each tyre and wheel - LF, LR, RF, RR.
3. Remove the tyre and wheel assemblies from the vehicle.
4. Closely inspect each tyre for proper and even bead seating.
5. If any of the tyre beads were not properly or evenly seated, reseat the tyre bead, then proceed to step 6. Refer to Tyre and Wheel Removal and Installation .
6. Mount a tyre and wheel assembly on a spin-type wheel balancer.

Locate the tyre and wheel assembly on the balancer with a cone through the back side of the centre pilot hole.




7. Wrap the outer circumference of each tyre with tape (1) in the centre tread area.

Wrapping the tread with tape allows for a smooth and accurate reading of radial runout to be obtained.

8. Position the dial indicator on the taped portion of the tyre tread such that the dial indicator is perpendicular to the tyre tread surface.
9. Slowly rotate the tyre and wheel assembly one complete revolution in order to find the low spot.
10. Set the dial indicator to zero at the low spot.
11. Slowly rotate the tyre and wheel assembly one more complete revolution and measure the total amount of radial runout.

Specification
Maximum tyre and wheel assembly radial runout - measured off-vehicle: 1.27 mm (0.050 in)




12. Position the dial indicator on a smooth portion of the tyre sidewall, as close to the tread as possible, such that the dial indicator is perpendicular to the tyre sidewall surface.
13. Slowly rotate the tyre and wheel assembly one complete revolution in order to find the low spot. Ignore any jumps or dips due to sidewall splices.
14. Set the dial indicator to zero at the low spot.
15. Slowly rotate the tyre and wheel assembly one more complete revolution and measure the total amount of lateral runout. Ignore any jumps or dips due to sidewall splices and attain an average runout measurement.

Specification
Maximum tyre and wheel assembly lateral runout - measured off-vehicle: 1.27 mm (0.050 in)

16. Repeat steps 6 through 15 until all of the tyre and wheel assembly radial and lateral runout measurements have been taken.
17. If ANY of the tyre and wheel assembly runout measurements were NOT within specifications, proceed to step 19.
18. If ALL of the tyre and wheel assembly runout measurements WERE within specifications, then the off-vehicle tyre and wheel assembly runout is considered acceptable.



19. Position the dial indicator on the horizontal outer surface of the wheel rim flange - with the tyre still mounted - such that the dial indicator is perpendicular to the rim flange surface.

Wheel runout should be measured on both the inboard and outboard rim flanges, unless wheel design will not permit. Ignore any jumps or dips due to paint drips, chips, or welds.

20. Slowly rotate the tyre and wheel assembly one complete revolution in order to find the low spot.
21. Set the dial indicator to zero at the low spot.
22. Slowly rotate the tyre and wheel assembly one more complete revolution and measure the total amount of wheel radial runout.

Specification

•	Maximum aluminium wheel radial runout - measured off-vehicle, tyre mounted: 0.762 mm (0.030 in)

•	Maximum steel wheel radial runout - measured off-vehicle, tyre mounted: 1.015 mm (0.040 in)




23. Position the dial indicator on the vertical outer surface of the wheel rim flange - with the tyre still mounted - such that the dial indicator is perpendicular to the rim flange surface.

Wheel runout should be measured on both the inboard and outboard rim flanges, unless wheel design will not permit. Ignore any jumps or dips due to paint drips, chips, or welds.

24. Slowly rotate the tyre and wheel assembly one complete revolution in order to find the low spot.
25. Set the dial indicator to zero at the low spot.
26. Slowly rotate the tyre and wheel assembly one more complete revolution and measure the total amount of wheel lateral runout.

Specification

•	Maximum aluminium wheel lateral runout - measured off-vehicle, tyre mounted: 0.762 mm (0.030 in)

•	Maximum steel wheel lateral runout - measured off-vehicle, tyre mounted: 1.143 mm (0.045 in)

27. Repeat steps 19 through 26 until all of the wheel radial and lateral runout measurements have been taken on each of the - tyre and wheel - assemblies with assembly runout measurements which were NOT within specifications.
28. If any of the wheel runout measurements were NOT within specifications, proceed to Measuring Wheel Runout - Tyre Dismounted.
29. For any of the wheel runout measurements which WERE within specifications, while the - tyre and wheel - assembly runout measurements were NOT within specifications, replace the tyre, then balance the assembly. Refer to Tyre and Wheel Assembly Balancing - Off Vehicle .
30. After replacement of any tyres, always re-measure the runout of the affected tyre and wheel assembly, or assemblies.
31. Using the matchmarks made prior to removal, install the tyre and wheel assemblies to the vehicle.
32. Lower the vehicle.

1. On the tyre and wheel assembly, or assemblies with wheel runout measurements - tyre mounted - which were NOT within specifications, mark each tyre and wheel in relation to each other.
2. Dismount the tyre from the wheel. Refer to Tyre Dismounting and Mounting .
3. Mount the wheel on a spin-type wheel balancer.
4. Locate the wheel on the balancer with a cone through the back side of the centre pilot hole.



5. Position the dial indicator on the horizontal inner surface of the wheel rim flange - with the tyre dismounted - such that the dial indicator is perpendicular to the rim flange surface.

Wheel runout should be measured on both the inboard and outboard rim flanges. Ignore any jumps or dips due to paint drips, chips, or welds.

6. Slowly rotate the wheel one complete revolution in order to find the low spot.
7. Set the dial indicator to zero at the low spot.
8. Slowly rotate the wheel one more complete revolution and measure the total amount of wheel radial runout.

Specification

•	Maximum aluminium wheel radial runout - measured off-vehicle, tyre dismounted: 0.762 mm (0.030 in)

•	Maximum steel wheel radial runout - measured off-vehicle, tyre dismounted: 1.015 mm (0.040 in)




9. Position the dial indicator on the vertical inner surface of the wheel rim flange - with the tyre dismounted - such that the dial indicator is perpendicular to the rim flange surface.

Wheel runout should be measured on both the inboard and outboard rim flanges. Ignore any jumps or dips due to paint drips, chips, or welds.

10. Slowly rotate the wheel one complete revolution in order to find the low spot.
11. Set the dial indicator to zero at the low spot.
12. Slowly rotate the wheel one more complete revolution and measure the total amount of wheel lateral runout.

Specification

•	Maximum aluminium wheel lateral runout - measured off-vehicle, tyre dismounted: 0.762 mm (0.030 in)

•	Maximum steel wheel lateral runout - measured off-vehicle, tyre dismounted: 1.143 mm (0.045 in)

13. Repeat steps 2 through 12 until all of the wheel radial and lateral runout measurements - tyre dismounted - have been taken on each wheel with runout measurements - tyre mounted - which were NOT within specifications.
14. If any of the wheel runout measurements - tyre dismounted - were NOT within specifications, replace the wheel.

Always measure the runout of any replacement wheels.

15. For any of the wheel runout measurements which WERE within specifications, while the - tyre and wheel - assembly runout measurements were NOT within specifications, replace the tyre, then balance the assembly. Refer to Tyre and Wheel Assembly Balancing - Off Vehicle .
16. Using the matchmarks made prior to dismounting the tyre, or tyres, mount the tyre, or tyres to the wheel, or wheels, then balance the assembly, or assemblies. Refer to Tyre and Wheel Assembly Balancing - Off Vehicle .

Always measure the runout of any of the tyre and wheel assemblies which have had the tyres dismounted and mounted.

17. Using the matchmarks made prior to removal, install the tyre and wheel assemblies to the vehicle.
18. Lower the vehicle.