Signs that there is a problem with the driving ruler

Signs that there is a problem with the driving ruler


If the car’s rulers are not periodically calibrated, in the long run it can cause the tires to wear out unevenly, the car is off the steering wheel, the vehicle is distracted …

What is a car driving ruler?


Car rulers are the system that connects the steering wheel to the front wheel of a car. The reason that from the steering wheel, the driver can control the direction of the front wheel thanks to the steering wheel.

See more:

  • Guide to adjust the steering wheel
Car rulers are the system that connects the steering wheel to the front wheel of a car

The handlebar is an important part of the screw-type steering system. This type of steering mechanism is most commonly used in cars today Hyundai i10, Toyota Vios, Toyota Innova, Mitsubishi Xpander

Car rulers construction


The structure of the rulers consists of two main parts: the screw and the tooth rod. The working principle of the steering system is when it is driven drive the steering wheel, the screw will rotate. The screw is engaged in the tooth bar, so the rod will move left or right.

The structure of the rulers consists of two main parts: the screw and the tooth rod

The ball joints (also called the rotuyn) connect the roulette’s teeth to the wheel motor, consisting of a pair of inner and outer rotuyn rotuyn. The rod and rotuyn form a trapezoidal drive system – known as a trapezoidal drive. The purpose of the trapezoid is to help keep the movement of the vehicle stable when turning, the inside wheel of the corner does not slide compared to the outside wheel.

What is the steering wheel alignment?


Steering wheel alignment (also known as suspension adjustment) is the adjustment of the wheel angle, helping to prolong the life Automobile tires, ensuring accuracy when driving, driving less drag, safe driving …

See more:

  • Advantages and disadvantages of holding the steering wheel
  • How to handle when the steering wheel is locked
Alignment of the steering wheel is the adjustment of the wheel angle

Why do we need to adjust the rulers?


In the process of using the vehicle, there are many subjective and objective factors that make the wheel precision and angle deviate from the original. Common causes are the car crashed into the curb, the car was hit hard when running through the pothole, the car crashed … With deep old car, many details on the wear suspension also easily lead to the out of alignment of the steering wheel.

Therefore, it is necessary to check and maintain the driving rulers periodically, calibrate the rulers if necessary to avoid uneven tire wear, the car is loose, the car is off the steering wheel …

When do we need to adjust the rulers?


According to car manufacturers’ recommendation, car owners should adjust the rulers periodically every 8,000 – 10,000 km. Besides, after modifying, replacing the suspension system, rotating the tire, replacing the tire … or after the car collides with a heavy collision, riding a lot of bumpy roads … the rulers should also be adjusted.

It is recommended to calibrate the rulers periodically every 8,000 – 10,000 km

In addition, when you see the following abnormal signs, you also need to check and calibrate the driving tape:

  • The tire surface is worn unevenly, often worn on the outside or inside edge, worn out …
  • The steering wheel is deflected, the car is distracted, pull / drift aside when driving in a straight line
  • Steering wheel is vibrated, return drive slowly

How to adjust the ruler of the car


The adjustment of the steering wheel to adjust the wheel placement angle so that the camber angle, toe angle (precision) and negative / positive caster angle are in accordance with the manufacturer’s standards.

Camber angle calibration

Camber angle is the angle of tilt of the wheel compared to the vertical axis viewed from the front. Camber angle too tilt will cause tires to wear unevenly. The positive camber angle is the angle at which the wheel is tilted outward. Large positive camber angle causes tires to wear a lot on the outside edge. Negative camber angle is the angle of inclination of the wheel inward. The large negative camber angle causes the tires to wear a lot on the inside edge.

Corner camber wheel cars

Precision adjustment (toe angle)

Precision (toe angle) is the direction of the tire relative to the center line when viewed from above. A large precision will cause the tire to wear unevenly. A positive precision is the angle when the wheels are facing each other. Too large a positive precision will cause the tire to wear unevenly on the outside edge, and the tire surface is worn in a feather pattern. Negative precision is the degree when the two wheels are facing outward. Excessive precision will cause the tire to wear unevenly on the inside edge, and the tire surface is shaped like a feather.

Automotive wheel precision

Caster angle alignment

The caster angle is the angle of the steering wheel shaft when viewed from the side of the vehicle. The positive caster angle is the steering axis that will face the front of the vehicle. Negative caster angle is the steering axis towards the body. Wheel caster angle alignment balances the vehicle’s ability to steer, stabilize and correct cornering precisely.

Corner caster wheels of cars

How much does the ruler scale cost?


The rider alignment price currently ranges from 350,000 to 1,500,000 VND / time depending on the type of vehicle. The time to adjust the steering wheel is quite fast, only about 30 minutes.

In addition to the adjustment, the car owner should periodically maintain the rulers to avoid errors such as heavy steering, slow return …

Minh Vuong

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