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Stabilizing Bar

Sometimes, we’re sitting out how our car works, but there’s a lot of users who don’t know the function of the stabilizing bars, some users change them because they’ve been recommended by a friend but they really don’t know what function they really do, what benefits they’ll get and what disadvantages they’ll have.

The fundamental rule of the mechanics applied to the car always dicts that to obtain an advantage you must always sacrifice something in return, for trivial and stupid that we can come to parade, this is always so.

If you increase the power of a motor to run more, the fuel consumption will always be greater and you will also rest reliability to it.
If you mount a harder suspension, you will always have fewer walking comfort
If you reduce the height of the carrossery to lower the center of gravity and increase the stability, you’ll have a greater risk of rosing the downs with some obstacle, and if you increase the height in a 4x4 balance and instability will increase.

Before doing any operation in our car we have to value the benefits we will get and the disadvantages we will have in return, obviously if the disadvantages are not a problem and do not affect us or are not important for us, then go ahead.

What about the stabilizing bars?

The stabilizer bar is a component of the suspension that allows to solidarize the vertical movement of the opposite wheels, minimizing the side inclination that suffers from the carrossery of a vehicle when it is subject to the centrifugal force typically in curves.

The stabilizing bar, being an elastic component, transfers part of the compression force of the suspension, associated with the external wheel, to the internal wheel.This produces a decrease in the compression that the external wheel suffers and therefore helps to a lower inclination of the carrossery of the vehicle.

The thicker the diameter of these bars, the more resistance will have to the tortion and the more flat the car will enter the curve

Estabilizadoras H&R

What benefits will I get by installing a stabilizer?

The assembly of some stabilizing bars is always for more, i.e. from smaller to greater diameter, never vice versa, more stability is sought not less.The advantages you will have:

  • Reduce the curvature
  • Increases carrossery stability and accuracy in driving or piloting
  • Reduce the rolling or balance effect of the car's transversal axis
  • Increases the adherence to the asphalt
  • Increases the integrity of the axis geometry
  • Increases passing speed per curve and reduces chronic times in competitions

The lower figure is quite descriptive of all the above mentioned, especially if you’re fixed on how the tires are supported on the asphalt.

Estabilizadoras H&R

 In the negative aspect, it is understood as "negative" not something that is bad, but that it is the counterpart that we will get to get what for us represents an improvement would be:

  • Reduction of walking comfort
  • More pilot skill is required because the chassis reaction is more instantaneous
  • Possibility of survive in untouched land, wet asphalt, ice, embarrassed etc

If these circumstances do not affect us or do not worry us, then go ahead with it !!

How do stabilizing bars work?

In the lower charts you will see a simulation of a car with the original bars (BEFORE) and the same car with a thicker stabilizing bars (AFTER)

When entering a curve, the outer wheels are compressed and also endure more weight by the inertia of the masses



On the contrary, the internal wheels are discharged.Therefore, a compression of the suspension on the external side and an extension on the internal side can be observed.This effect can cause any of the internal wheels to lose contact with the floor.

For sports driving, overdimensional bars are mounted with a greater diameter for the car to enter and out of the more flat curves.


Barras estabilizadoras

On the contrary, the internal wheels are discharged.Therefore, a compression of the suspension on the external side and an extension on the internal side can be observed.This effect can cause any of the internal wheels to lose contact with the floor.

When is it recommended to install stabilizing bars?

The assembly of stabilizers is always associated with the competition and in general when the performance of a car is increased, if we increase the power, necessarily we have to look for a balance of the engine with the chassis, nothing serves to pass from 200 to 200 400 cv if the chassis remains invariated since it came out of origin, on the contrary, the thing can go worse.

Keep in mind that it can be much more competitive a car that has passed 200 to 300 cv with an optimized chassis than one that has passed 200 to 300 cv 400 cv without touching the chassis.

Always keep in mind the kind of firm by which your car will circulate most of the times, if it is flat (type circuit) then if it is recommended to mount the stabilizers, if it is irregular or bushed, then you can have more problems.

If 90% of the time circulates by flat asphalt, you will notice a spectacular difference, you will see how your car has a much higher grip and has a more specific accuracy of a race car

If 10% of the time you circulate by very wet roads or circulate a day with a lot of rain, then you will have to have patience, reduce the speed and take it more calmly

Many people mistakenly believe that mounting hard suspensions is the solution, and better the more hard.
The false.If the amortisator is excessively rigid and the mole does not work, then the chassis does not copy the asphalt and does not do more than reboot, the wheels are longer in the air than in the asphalt.

Sometimes it’s better, combining a moderately hard sports suspension with a chassis stabilizer can do your job well.

Mechanics is not an exact or absolute science as mathematics may be, but it is relative, and depends on the perception of each user, two plus two are four for the whole world, while the perception of a hard suspension is very subjective and while for one user it can be hard for another it can be soft or vice versa.

Balance or “rolling” effect

In the following picture we can see the the balance, which is around which the balance movement of the car is produced in curves.

We also observe the the gravity centerit is the center of all the forces that act in the car.The balance is formed by the inercies of the vehicle when turning and influence a great number of elements, both the weight and height, the distance between axis and center of gravity, the vertical pressure.

But from the point of view of the settings, there are certain points that dramatically affect the said balance, one of them is the hardness of the mole that mount the amortisator and another the stabilizers that correct the balance.

efecto rolling

Any mole that is blank favors balanceWhen the vehicle takes a curve, the action of the centrifugal force charges the weight of the car over the outer wheels, with which the carrossery tends to incline to that side by compressing the outer wheels, giving them an additional grip, which would favour to take a curve in theory.

However, the theory works, but always on perfect assumptions.A car with a great balance has a tendency to roll when you find the minimum obstacle, a stone, a bush... or when you take the curve a little faster than you should.In addition to provoking suburbs (the car runs less than it should)

In order to avoid negative effects such as turning or subviration, stabilizing bars are mounted.In this way, by taking a curve, as one of the wheels tends to go down and the other to rise, the bar that stabilizes the difference between the two sides and prevents the carrossery from being so inclined, keeping it more stable.That vertical upward movement of the outside wheel is transmitted to the inner wheel through the bar, achieving almost the horizontal position of the vehicle in curves.


Installing stabilizing bars always generally greatly improves the vehicle behavior.In any case, it is always better to have the opinion of an expert who analyzes the situation.

Certainly with the commented you have clearer the basic concepts about the stabilizing bars, but in summary, the more rigid, thick or tensed a stabilizer, the harder it will be to roll the car, but we will lose grip especially in unhelded or wet floors, which in certain cases can harm our time around.

As we have commented before, if not your case, forward with it, tand we guarantee you will notice the difference 100% !!