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Wheel Alignment

Wheel alignment is the geometrical relationship of the wheels to the vehicle itself, to each other, and to the road. Ideally, all four wheels should be aimed straight ahead, parallel to each other, perpendicular to the road and perpendicular to their respective axles. This will produce the least amount of rolling resistance, the least amount of friction, the least amount of tire wear, and the greatest traction. The basic alignment angles are Toe, Camber, & Caster.

 

 

Toe Alignment 

 

Toe is the most important wheel alignment angle because it has the greatest effect on tire wear. Improperly set Toe causes the tires to scrub as they roll along. For instance, only 1/8th inch of toe-out will scrub the tires sideways 28 feet for every mile driven. At this rate, it doesn't take long to wear down the tread.

When both front wheels are aimed straight ahead and the distance between the leading edges of both tires is exactly the same as the distance between the trailing edges, the wheels have "zero toe".

 

Toe-in means the front edges of the tires are closer together than the rear edges.

 

Toe-out is when the front edges of the tires are farther apart than the rear edges.

 

A classic symptom of toe misalignment is a feathered wear pattern across both front tires. The direction of the feathering tells you if the tires are toed-in or toed-out (rough edges towards the inside signal toe-in while rough edges to the outside indicate toe-out).

 

Worn Parts Affect Toe Alignment

 

Worn or loose steering linkage parts should always be replaced. After the parts have been installed, an alignment will be needed.

 

Something else to keep in mind about toe is that rear toe is just as important as front toe. Rear toe misalignment can also cause toe wear on both the front and rear tires by creating a steering pull to one side. A difference in rear toe angles side-to-side creates a condition called "Thrust angle".

 

 

 

Camber Alignment

 

The next most important wheel alignment angle is camber. Camber refers to the tilt of the wheels as viewed from the front or the rear. Camber is the inward (negative) or outward (positive) tilt of the wheels. It is usually measured in degrees.

 

If camber is out of specs, a tire can wear unevenly on one shoulder and the vehicle may pull toward the side with the most camber.

 

Keep in mind that camber applies to both front and rear wheels, though only vehicles with independent rear suspensions typically have rear camber alignment specifications. Most rear-wheel drive cars and trucks with solid axles do not have rear camber specifications because there's no way to change it (even so, a bent rear axle can cause a camber problem!).

 

Excessive camber can be caused by bent or worn parts. If any of these parts are replaced, camber must be checked and adjusted as needed after the parts have been installed.

 

 

 

Caster Alignment

 

The third most important wheel alignment angle is caster, which is the forward (negative) or rearward (positive) tilt of the steering axis as viewed from the side. Caster is usually measured in degrees.

 

Caster is an angle that doesn't affect tire wear directly. Its greatest effect is on steering stability, steering effort and steering return. So, it is often the most ignored angle.

 

If there’s too much difference in caster side-to-side, it can cause a vehicle to drift or pull to one side. Some alignment specs call for a slight difference in caster to compensate for road crown. As a rule, caster should usually be within half a degree side-to-side.

 

The same kind of problems that can cause camber misalignment can cause caster misalignment: bent or worn parts. So, if any parts are replaced, caster should be checked and readjusted as necessary after the parts have been installed.

 

 

Thrust Angle 

 

A vehicle’s thrust angle affects its steering wheel position, stability control calibration and electric power assist calibration. It can also cause a pull or drift to one side. Like a forklift, if the rear tires point to the left, the vehicle will steer to the right.

 

The thrust line should be parallel with the vehicle’s geometric center line.

 

Axle offset occurs when a rear axle points off-center. This condition can be caused by curb impacts or broken, worn or bent components. 

 

 

 

 

 

Maintaining Proper Wheel Alignment

 

The only way to be sure the wheels are properly aligned is to perform an alignment inspection.

Alignment Plus recommends an alignment inspection if you have one or more of the following:

    Tires are wearing unevenly.

    New tires have been installed.

    The vehicle has been involved in a collision.

    The steering wheel is off-center while driving straight.

    The vehicle pulls or drifts to one side.

    New suspension or steering components have been installed.

    You wish to improve your vehicle's handling or performance.

    You simply want to have peace-of-mind that the alignment is correct.

 

Also, worn parts will not hold an accurate alignment because they have too much play. There's also the danger that a component failure could result in the collapse of the suspension and/or loss of steering control. It makes no sense to attempt to perform a wheel alignment until worn or damaged parts have been replaced. This is why the suspension and steering components must be checked during an alignment inspection.

 

Even new vehicles can benefit from an alignment check if the wheels were not properly adjusted at the factory. Some factory specifications allow a very wide range of settings, which may result in less-than-ideal tire wear and handling characteristics

 

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