Wheel to Tire Runout Minimization
Check
NOTE: Road Force® values in illustrations are shown in pounds.
NOTE: Match mounting is a technique used to reduce radial runout or road force on wheel and tire assemblies. Excessive runout is a source of ride quality complaints and match mounting can be used to minimize the runout. Match mounting can be accomplished by changing the position of the tire on the wheel.
NOTE: Position the wheel and tire assembly on a tire machine and put a reference mark on the tire sidewall at the valve stem position.
Step 1
1. Valve stem
2. Reference mark
2. NOTICE: For vehicles equipped with a TPMS, the sensor may be damaged by incorrect tire
mounting or dismounting. Dismount the tire from the wheel as instructed in the procedure. Failure to follow these instructions may result in TPMS component damage.
NOTE: Always make sure that the final high spot and measurement values are permanently marked on the inward sidewall of the tire for reference during future wheel and tire service.
Marker. Using a suitable tire machine, separate the tire beads from the wheel.
3. Lubricate the tire beads using a suitable fast drying, corrosion inhibiting tire bead lubricant. Position the tire 180 degrees (half-way around) on the rim so the valve stem reference mark is now opposite the valve stem.
4. Re-inflate the wheel and tire assembly to the specified air pressure and measure the assembly again using a suitable dial indicator or Hunter Road Force® 9700 Series Wheel Balancer. Mark the second high spot on the tire.
5. If the runout or Road Force is reduced to within specifications, the concern has been resolved. Balance the assembly and install on the vehicle using the Wheel-to-Hub Optimization procedure.
6. If the second runout or Road Force® measurement is still not within specification and both high spots are close to each other (within 101.6 mm [4 in]), the root cause is probably the tire (the high spot followed the tire).
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.