Road Test

Verify the customer concern by carrying out a road test on a smooth road. If any vibrations are apparent, refer to Noise, Vibration, and Harshness Diagnosis.
To maximize tire performance, inspect for signs of incorrect inflation and uneven wear, which can indicate a need for balancing, rotation, or a suspension alignment.
Correct tire pressure and driving techniques have an important influence on tire life. Heavy cornering, excessively rapid acceleration and unnecessary sharp braking increase tire wear.
Replacement tires should follow the recommended:
- tire sizes
- speed rating
- load range
- tire construction type

Use of any other tire size or type may seriously affect:
- ride
- handling
- speedometer/odometer calibration
- vehicle ground clearance
- tire clearance between the body and chassis
- wheel bearing life
- brake cooling

Wheels need to be replaced when:
- bent
- dented
- cracked
- heavily corroded
- leaking
- they have elongated wheel hub bolt holes
- they have excessive lateral or radial runout

Wheel and tire assemblies are attached by five wheel nuts.
It is mandatory to use only the tire sizes recommended on the tire chart attached to the vehicle. Larger or smaller tires can damage the vehicle, affect driveability, and require changing the speedometer calibration. Make sure wheel size and offsets match those recommended for the tire in use.
1. Inspect for signs of uneven wear that can indicate a need for balancing, rotation, suspension alignment, or damaged steering components.
2. Check tires for:
- cuts
- stone bruises
- abrasions
- blisters
- embedded objects

3. Tread wear indicators are molded into the bottom of the tread grooves. Install a new tire when the indicator bar becomes visible.