We Solve Tire Pull Problems
We solve tire pull problems with the Hunter Road Force® GSP9700 that regular alignment services cannot fix.
Tire-related pulls are caused by lateral forces in the tires. Lateral force is the amount of left or right pull force created as the tire rolls along the road. This condition may cause a vehicle to steer away from straight-ahead. These forces are primarily created by conicity and cannot be detected during standard balancing or alignment service.
The StraightTrak® LFM feature measures lateral tire force during the Road Force® GSP9700’s Road Force Measurement® test. The Road Force® GSP9700 then applies this lateral force information to the set of tires, providing the technician with optimal placement choices about the vehicle.
Giving Your Tires Top Performance Tuning
By partnering a StraightTrak LFM equipped Road Force® GSP9700 with a Hunter wheel alignment system, our technicians will finally be able to deliver ultimate satisfaction by giving your tires the four main wheel service criteria you expect in vehicle ride quality:
- Proper Tire Wear
- Straight Vehicle Tracking
- Smooth Ride
- Straight Steering Wheel
Eliminate Tire and Wheel Vibration
Hunter’s GSP9700 that we use is both a balancer and a vibration control system. It is also a Road Force Measurement analyzer for passenger car and light truck tire/wheel assemblies.
Each tire/wheel assembly is tested for the amount of dynamic/static imbalance and Road Force.
The machine simulates a “road test”, with a unique “load roller” which applies up to 1400 lbs of force against the rotating wheels. The roller measures the loaded runout and automatically recommends corrections when needed. The technology eliminates many of the time consuming, subjective and often non-productive manual measurements previously used to diagnose and repair ride disturbance concerns.
The image on the right shows an example of one of the diagnostic screens we see with this technology.
Consider all the wheel-related items that can cause vibration when you drive:
- Wheel Imbalance
- Runout of the:
c. Rim and tire, together as an assembly
- Force Variation of the Tire
- Mounting Error While Balancing
- Issues Related To The Vehicle:
a. Bent hubs
b. Mounting of the wheel to the vehicle hub off center
c. Excessive radial runout of the studs
d. Out of balance rotors and drums
Up until now the wheel service industry could only balance wheels. The new technology fills the gap — actually doing about 75% more than just wheel balancing.
What Are the Issues?
Let’s review some of the common alignment and balance issues…
Have you ever heard a client say he is still experiencing wheel vibration after having the wheels balanced? Many people do not realize that balancing is only a small portion of wheel vibration. If the wheel never came in contact with the road, then balancing would be sufficient. A square wheel can be balanced, but a square wheel will not give a smooth ride.
Not usually checked until there is a problem. Bent rims or defective tires might be found “by an experienced eye,” but we all know that most operators of this type of equipment have little experience or training. Is it the runout in the rim, tire or a combination? How much is too much? Is it affecting the ride quality? These questions are tough to answer. Runout is usually considered after the customer notices continued vibration. This diagnostic time is usually done at the expense of shop labor profits and can be time consuming. What about the customers who have a problem and don’t return going to another shop looking for an answer?
Many rim manufacturers measure runout during the assembly of the rim. The valve stem location is sometimes drilled to the request of the OEM at the low or high side of runout or a paint dot or stamp is placed at the identified location.
Many rims on the market today are also purposely designed so that the pilot hole is .002-.004″ off-center to allow for adjustment capabilities by the assembly lines when encountering force variation on the tire. It gives the chance to adjust for tire force variation if runout is induced into the rim. But up to this point ONLY BY THE OEM!
Up until now, anyone could measure rim runout at the bead seats with a dial indicator. The drawbacks? It’s too time consuming. The GSP9700 will automatically measure the inner and outer bead seat and determine the effects on your auto’s ride quality.
Force Variation (Tire Uniformity)
Radial force variation is the amount of change in stiffness of the sidewall and footprint when a load is placed against the tire. There are specifications and acceptable limits from tire manufacturers. Up until now, force variation has been measured only by OEM’s in an industrial setting using equipment in the range of half a million dollars. For example, a tire and rim could be perfectly round when measured with a dial indicator (free runout) and the wheel will still vibrate when driven due to excessive force variation.
Many tires on the market today have a “paint dot” or mark on the tire that indicates either the high side or low side of force variation. Many have attempted to solve vibration problems by blindly “Lining up the dot” with the valve stem. The operator assumes the “dot” is the high point of radial force of the tire and the wheel valve stem hole is the low point of runout of the rim.
Unfortunately, this is not always true. Many tires are not marked and many wheel manufacturers do not use the valve stem as the low point. Other OEM’s use the marks to indicate high points instead of low points! The GSP9700 eliminates any guesswork. The locations of runout and tire force are quickly located and measured. The GSP9700 also automatically determines if they can be used to solve an existing non-balance related vibration, before any extra work is performed.
The wheel, when balanced, must be mounted on the vehicle the same way it came off the balancer. All too often, the technician improperly mounts the wheel on the vehicle off center and the balance is compromised.
Today’s vehicle designs are lighter and more sensitive to road feel. It has become more critical to be aware of wheel mounting on vehicles to eliminate vibration during balancing.
The GSP9700 will automatically alert the technician when a mounting error is detected on the balancer, thus preventing improper centering on the balancer from taking place.
To summarize this very long page, the quality of your ride, no matter what you drive, rests on a proper alignment and balancing of your tires and wheels. At Europa Auto, we do things differently.
- With the new technology that we use, virtually all possible complaints due to Wheel Balance, Tire Runout, Rim Runout, Tire Force Variation, and Mounting Error are all eliminated before the tire and wheel assembly is placed on your vehicle.
- 100% Seamless Quality Control of all wheels going out the door. It takes no more effort, and no more steps for us to get it prefect than for us to do an everyday type of wheel balance.
- If there is a vibration coming from the vehicle when it is driven after the wheels are measured on the Hunter GSP9700… then the problem IS NOT WHEEL RELATED! No more wasted diagnostic time. No more swapping of tires. No more falsely blamed tires sent back to the manufacturer. No more time spent tracking down blind vibration problems that cannot be traced. This is good for us, this is good for the tire manufacturer, AND GOOD FOR YOU, our customer. There is not another piece of equipment available that can do this.
- Now if there is a problem. What can we do to fix it?
a. Grinding the tire?
Ugh… Who wants to have their brand new tire ground away? There are a number of serious problems associated with this process.
b. Match the heavy spot of the tire with the light spot of the rim?
No! For years, traditional wheel balancers have offered this form of weight optimization. The primary benefit here is reducing weight; however, this does not take into consideration force variation. In some cases, weight optimization can even increase force variation complaints. The vibration becomes worse.
How We Eliminate Tire and Wheel Vibration
Using the Hunter GSP9700, it’s possible for us to:
- Match the Tire to the Rim
This can be helpful if the first harmonic of the rim can be indexed to cancel the force variation of the tire. As stated previously, this is not the same as matching the imbalance of the tire to rim to minimize weight.
- R & R Tire or Rim
Replace the defective rim or defective tire and also be able to locate and quantify the problem.
- Record the Value and Reuse the Tire on Another Rim!
If a rim and tire cannot be matched, and the tire is not out of spec, the actual value of the force variation can be written on the sidewall of the tire and placed back on the shelf. At a given point in time the entire inventory in that tire size can be “measured.” Eventually a “measured” tire can be hand picked to match a given rim. This would be analogous to picking an alignment shim to fix the alignment condition and bring the wheel as a “tire and rim” back into specification. The GSP9700 moves vibration solving in wheels to a new level of professionalism. “Road Force Measurement” against the wheel before the balance — this is something that has been needed for years!
This allows us to give you the best possible performance from your tires and wheels… You won’t find this service everywhere, but you will at Europa.
To Speak With Us
Dial or Tap (407) 801-4711
Visit Our Shop
105 Candace Drive, Unit 101 Maitland, FL 32751