Page 1 of 3
CIRCULATE TO: [ ] GENERAL MANAGER
[X] SERVICE ADVISOR [X] SERVICE MANAGER [X] WARRANTY MGR [ ] SALES MANAGER
[X] PARTS MANAGER [X] TECHNICIAN
TIRE AND WHEEL VIBRATION AND RADIAL
THIS BULLETIN SUPERSEDES TSB# 06-50-013 TO INCLUDE 2008 MODEL YEAR
NOTE: Each wheel and tire assembly is precision balanced and force match
mounted before the vehicle leaves the assembly line. Dealers should not
alter the dynamic balance of any wheel unless a customer describes
experiencing a tire/wheel vibration condition.
A customer may describe a steering wheel vibration or "shimmy" condition in the
vehicle. Sources of vibration/shimmy may be from the following conditions:
1. Wheel and tire assembly out of balance
2. Wheel out of round
3. Tire assembly stiffness variation (Radial Force Variation or RFV)
RFV (Radial Force Variation) may be defined as the amount of change in stiffness of
the sidewall and footprint when a load is placed against a tire.
Wheel and tire assembly imbalance should be addressed first because it is the most
common cause of vibration. A well maintained off-vehicle, two-plane dynamic wheel
balancer can accurately correct this condition.
If a vibration or shimmy is still present after an imbalance condition is corrected, any
out-of-round condition of the wheel and force variation of the tire must be addressed.
NOTE: All of the above conditions may be addressed at the same time if
equipment is available such as the Hunter GSP 9700, which is a two-plane
Page 2 of 3
For proper diagnosis, it is important that the wheel run-out and tire assembly
stiffness variations be measured and, if necessary, corrected before replacing
any component(s) on the vehicle.
To correct vehicle vibrations caused by wheel out-of-round and tire stiffness variations,
access to a Hunter GSP 9700 or equivalent wheel balancing machine is necessary. If
you do not have access to such equipment, it may be located through the Hunter
website (Hunter GSP9700 Wheel vibration Control System solves wheel vibration and tire pull problems that balancers and aligners can?t fix
For information about the purchase of a Hunter GSP 9700 and Hyundai's special
pricing, please visit website (Welcome to SPX Hyundai
Follow the machine manufacturer's procedure to measure and correct wheel and tire
assembly RFV related vehicle vibrations.
The following assembly RFV may be used as guide:
• P-Metric passenger vehicle wheel and tire assemblies = 18 ~20 lbs or less
• P-Metric SUV and Van wheel and tire assemblies = 24 ~27 lbs or less
Page 3 of 3
NOTE: This information is a guideline, and the RFV range accounts for machine
If force match mounting the wheel and tire assembly to the above guideline
cannot be achieved, it may be necessary to replace a wheel or tire or both to correct
the vibration condition (see note below before replacing any part). Since tires can
sometimes become temporarily flat-spotted, the RFV should be measured
immediately after the vehicle is driven at least 10 miles. (If the RFV cannot be
measured immediately after the vehicle has been driven at least 10 miles, elevate the
vehicle on a hoist with the wheels hanging to stop the tires from flat-spotting). Tire
pressure must also be adjusted to the recommended pressure shown on the driver's
door or B-Pillar.
NOTE: If the vehicle vibration condition cannot be improved to an acceptable
level using the above procedure or a tire or wheel is required to be
replaced to correct this condition, contact the Hyundai Technical
Assistance line at (800) 325-6604.
REQUEST TO CALLING TECHNICIAN:
The dealer technician must provide the following information to the Technical
1. Customer description of the condition
4. Tire size
5. Tire manufacturer
6. Tire condition
7. Wheel - alloy or steel
8. Wheel Hyundai or aftermarket
9. Imbalance values (inside and outside)
10. 1st and 2nd order RFV values in lbs
11. Wheel run-out values (radial and axial)
12. Location of the wheel on vehicle (RF, LF, RR, LR)
NOTE: Printed copy of any of the above information will be appreciated.