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<title>Wheel alignment</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Wheel alignment</span></span>

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</style><div class="thumb tmulti tright"><div class="thumbinner multiimageinner" style="width:204px;max-width:204px"><div class="trow"><div class="tsingle" style="width:202px;max-width:202px"><div class="thumbimage"><span typeof="mw:File"></span></div></div></div><div class="trow"><div class="tsingle" style="width:202px;max-width:202px"><div class="thumbimage"><span typeof="mw:File"></span></div></div></div><div class="trow"><div class="tsingle" style="width:202px;max-width:202px"><div class="thumbimage"><span typeof="mw:File"></span></div></div></div><div class="trow" style="display:flex"><div class="thumbcaption">Wheel alignment of a <a href="Ford_Focus" title="Ford Focus">Ford Focus</a>.</div></div></div></div>

<p><b>Wheel alignment,</b> which is sometimes referred to as <b>breaking</b> or <b>tracking,</b> is part of standard <a href="Automobile" class="mw-redirect" title="Automobile">automobile</a> <a href="Car_maintenance" class="mw-redirect" title="Car maintenance">maintenance</a> that consists of adjusting the angles of wheels to the car manufacturer specifications.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> The purpose of these adjustments is to reduce <a href="Tire" title="Tire">tire</a> wear and to ensure that vehicle travel is straight and true (without "pulling" to one side). Alignment angles can also be altered beyond the maker's specifications to obtain a specific handling characteristic. Motorsport and off-road applications may call for angles to be adjusted well beyond <b>normal,</b> for a variety of reasons.

</p>

<div class="mw-heading mw-heading2"><h2 id="Primary_angles">Primary angles</h2></div>

<p>The primary angles are the basic angle alignment of the wheels relative to each other and to the car body. These adjustments are the <a href="Camber_angle" title="Camber angle">camber</a>, <a href="Caster_angle" title="Caster angle">caster</a> and <a href="Toe_(automotive)" title="Toe (automotive)">toe</a>. On some cars, not all of these can be adjusted on every wheel.

</p><p>These three parameters can be further categorized into front and rear (with no caster on the rear, typically not being steered wheels). In summary, the parameters are:

</p>

<ul><li>Front: <a href="Caster_angle" title="Caster angle">Caster</a> (left & right)</li>

<li>Front: <a href="Camber_angle" title="Camber angle">Camber</a> (left & right)</li>

<li>Front: <a href="Toe_(automotive)" title="Toe (automotive)">Toe</a> (left, right & total)</li>

<li>Rear: <a href="Camber_angle" title="Camber angle">Camber</a> (left & right)</li>

<li>Rear: <a href="Toe_(automotive)" title="Toe (automotive)">Toe</a> (left, right & total)</li></ul>

<div class="mw-heading mw-heading2"><h2 id="Secondary_angles">Secondary angles</h2></div>

<p>The secondary angles include numerous other adjustments, such as:

</p>

<ul><li><a href="Scrub_radius#Steering_axis_inclination" title="Scrub radius">SAI</a> (Steering Axis Inclination)</li>

<li>Included angle</li>

<li>Toe out on turns</li>

<li>Maximum Turns</li>

<li>Toe curve change</li>

<li>Track width difference</li>

<li>Wheelbase difference</li>

<li>Front ride height</li>

<li>Rear ride height</li>

<li>Frame angle</li>

<li>Setback</li></ul>

<p>Setback is the difference between right side and left side <a href="Wheelbase" title="Wheelbase">wheelbase</a> length. It can also be measured as an angle. Setback less than the manufacturer specified tolerance (for example, about 6mm) does not affect car handling. This is because when the vehicle is turning, one wheel is ahead of the other by several centimetres and therefore the setback is negligible. There are some car models with different factory setting for right and left side wheelbase length, for various design reasons. An off-spec setback may occur because of a collision or a difference between right and left caster.

</p><p>Rake is the difference between the front and rear ride heights, a positive number when the rear ride height is larger.

</p>

<div class="mw-heading mw-heading2"><h2 id="Measurement">Measurement</h2></div>

<p>A camera unit (sometimes called a "head") is attached to a specially designed clamp which holds on to a wheel. There are usually four camera units in a wheel alignment system (a camera unit for each wheel). The camera units communicate their physical positioning with respect to other camera units to a central computer, which calculates and displays. <sup id="cite_ref-:0_2-0" class="reference"><a href="#cite_note-:0-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>

</p><p>Often with alignment equipment, these "heads" can be a large precision reflector. In this case, the alignment "tower" contains the cameras as well as arrays of LEDs. This system flashes one array of LEDs for each reflector, whilst a camera centrally located in the LED array "looks for" an image of the reflectors patterned face. These cameras perform the same function as the other style of alignment equipment, yet alleviate numerous issues prone to relocating a heavy precision camera assembly on each vehicle serviced. <sup id="cite_ref-:0_2-1" class="reference"><a href="#cite_note-:0-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>

</p>

<div class="mw-heading mw-heading2"><h2 id="Camber">Camber</h2></div>

<p>Camber is the angle which the vertical axis of the wheel makes with the vertical axis of the vehicle. This angle is very important for the cornering performance of the vehicles. Generally, a Camber around 0.5-2 degrees is given on the vehicles. Depending upon wheel orientation, Camber can be of three types.

</p><p>1. Positive Camber

</p><p>The Camber would be called positive when the top of the wheels lean outwards. Positive Camber is generally used in off-road vehicles as it improves steering response and decreases steering effort. Positive Camber is also used in load-carrying vehicles. This is because the heavy load on these vehicles causes outward-leaning wheels to straighten up, improving the vehicle stability.

</p><p>2. Zero Camber

</p><p>The vehicle is said to have zero Camber when the wheels stand perfectly straight on the ground.

</p><p>3. Negative Camber

</p><p>Negative Camber is encountered when the top of the wheels lean inwards. Providing Negative Camber improves the cornering performance. When the vehicle turns on a corner, it performs a circular motion. Hence, it experiences equal and opposite centripetal & centrifugal forces. The centripetal force is experienced in the form of friction on tyres. The centrifugal force experienced by the car tries to throw it away from the turning center. This increases the normal reaction on the outer wheels.

Due to increase in normal reaction, the frictional force on the outer tyres also increase. This friction acts as centripetal force and tries to bend the outer tires inwards. The tires get deformed due to bending and the contact area between the wheels and the ground decreases. This in turns decreases the frictional force between the outer tires and the ground, causing the vehicle to drift during cornering. Hence a negative Camber is given to the vehicles. The negatively cambered wheels lean inwards. So during cornering when the frictional forces try to deform the outer wheels, they just simply get flat on ground, increasing the friction with the road surface.

</p>

<div class="mw-heading mw-heading2"><h2 id="Types_of_wheel_alignment_equipment">Types of wheel alignment equipment</h2></div>

<p>There are several types of wheel alignment equipment systems, and each operate in different ways.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup>

</p><p><b>Laser-Based Systems: The Traditional Approach</b>

</p><p>Laser alignment systems represent a more traditional approach. These systems utilise fixed heads attached simply to, or hung from each wheel, projecting laser beams to measure angles and positions. While generally considered less precise than newer technologies, laser systems are often praised for their robustness and reliability, making them a suitable choice for certain applications. However, their accuracy can be more susceptible to environmental factors and not suitable where precise accuracy is needed.

</p><p><b>CCD (Charge-Coupled Device) Systems:</b> <b>Computerised Wheel Alignment</b>

</p><p>CCD alignment systems introduce computer control into the wheel alignment process. These systems employ cameras, either integrated into the main unit or attached to the wheel-mounted heads, to capture measurements. The captured data is then processed by an onboard computer, comparing it against a database of manufacturer specifications. This computerised approach allows for the detection of even minor deviations from recommended settings, enhancing accuracy compared to purely laser-based systems.

</p><p><b>3D Imaging:</b> <b>Giving More Accurate 4-Wheel Alignment</b>

</p><p>3D wheel alignment systems represent a step forwards in vehicle wheel alignment. Employing advanced three-dimensional imaging technology, these systems rapidly capture a comprehensive picture of wheel angles and positions. Like CCD systems, 3D aligners rely on a vehicle database for comparison and offer exceptional speed and accuracy, capable of identifying the smallest misalignments. The detailed data provided by 3D systems allows for more intricate adjustments and a more thorough understanding of the vehicle's alignment geometry, particularly suited to 4 wheel drive cars or those needed 4 wheel alignment.

</p><p><b>Drive-over, Drive-on or Drive Through Wheel Alignment Systems: Next Generation Alignment</b>

</p><p>The most recent, and certainly most expensive wheel alignment systems employ touchless systems to analyse the wheel geometry. These aligners no longer require heads to be hung on or clamped to the car wheels, instead the car either drives over a speed-bump style device that records the wheel and tyre measurements, or other aligners all the car to be driven between pillars containing fixed cameras that take the measurements from the vehicle wheels as they drive into, or through the view of the cameras. These represent the next generation of wheel alignment systems, and whilst they may be cost prohibitive for some workshops, the throughput of vehicles may help justify the costs where the volume of vehicles being aligned may justify this.

</p><p><b>Portable Alignment Machines: Mobility and Convenience</b>

</p><p>For mobile mechanics or workshops with limited space, portable wheel alignment machines offer a practical solution. Designed for easy transport and setup, these systems are lightweight and compact. While convenient, portable systems may not achieve the same level of accuracy as their larger, stationary counterparts. They are often chosen for their flexibility rather than ultimate precision.

</p>

<div class="mw-heading mw-heading2"><h2 id="Signs_of_a_bad_wheel_alignment">Signs of a bad wheel alignment</h2></div>

<ul><li>The vehicle pulls to one side</li>

<li>The steering wheel does not return to center</li>

<li>The steering wheel is off-center</li>

<li>Excessive tire wear in certain spots</li>

<li>Loose steering</li></ul>

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<ul><li><a href="Auto_mechanic" title="Auto mechanic">Auto mechanic</a></li>

<li><a href="Car_handling" class="mw-redirect" title="Car handling">Car handling</a></li>

<li><a href="Car_maintenance" class="mw-redirect" title="Car maintenance">Car maintenance</a></li>

<li><a href="Tire_balance" title="Tire balance">Tire balance</a></li>

<li><a href="Tire_rotation" title="Tire rotation">Tire rotation</a></li></ul>

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<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.yournewtyres.co.uk/pages/wheel-alignment">"Wheel Alignment - YourNewTyres"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">2020-06-14</span></span>.</cite></span>

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<li id="cite_note-:0-2"><span class="mw-cite-backlink">^ <a href="#cite_ref-:0_2-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-:0_2-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><cite class="citation news cs1"><a rel="nofollow" class="external text" href="https://www.pro-align.co.uk/things-to-consider-when-choosing-an-aligner/">"Things to consider when choosing an aligner | Pro-Align"</a>. <i>Pro-Align</i><span class="reference-accessdate">. Retrieved <span class="nowrap">2017-11-27</span></span>.</cite></span>

</li>

<li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><cite id="CITEREFEquipment2023" class="citation web cs1">Equipment, Concept Garage (2023-04-12). <a rel="nofollow" class="external text" href="https://concept-ge.co.uk/learn-about-wheel-alignment/">"Learn About Wheel Alignment"</a>. <i>Concept Garage Equipment</i><span class="reference-accessdate">. Retrieved <span class="nowrap">2025-02-07</span></span>.</cite></span>

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<li><a href="History_of_steam_road_vehicles" title="History of steam road vehicles">Steam engine</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Propulsion_transmission" class="mw-redirect" title="Propulsion transmission">Transmission</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Automatic_transmission" title="Automatic transmission">Automatic transmission</a></li>

<li><a href="Chain_drive#Automobiles" title="Chain drive">Chain drive</a></li>

<li><a href="Direct-drive_mechanism" title="Direct-drive mechanism">Direct-drive</a></li>

<li><a href="Clutch" title="Clutch">Clutch</a></li>

<li><a href="Constant-velocity_joint" title="Constant-velocity joint">Constant-velocity joint</a></li>

<li><a href="Continuously_variable_transmission" title="Continuously variable transmission">Continuously variable transmission</a></li>

<li><a href="Coupling" title="Coupling">Coupling</a></li>

<li><a href="Differential_(mechanical_device)" title="Differential (mechanical device)">Differential</a></li>

<li><a href="Direct-shift_gearbox" title="Direct-shift gearbox">Direct-shift gearbox</a></li>

<li><a href="Drive_shaft" title="Drive shaft">Drive shaft</a></li>

<li><a href="Dual-clutch_transmission" title="Dual-clutch transmission">Dual-clutch transmission</a></li>

<li><a href="Drive_wheel" title="Drive wheel">Drive wheel</a></li>

<li><a href="Automated_manual_transmission" title="Automated manual transmission">Automated manual transmission</a></li>

<li><a href="Electrorheological_clutch" title="Electrorheological clutch">Electrorheological clutch</a></li>

<li><a href="Epicyclic_gearing" title="Epicyclic gearing">Epicyclic gearing</a></li>

<li><a href="Fluid_coupling" title="Fluid coupling">Fluid coupling</a></li>

<li><a href="Friction_drive" title="Friction drive">Friction drive</a></li>

<li><a href="Gear_stick" title="Gear stick">Gearshift</a></li>

<li><a href="Giubo" title="Giubo">Giubo</a></li>

<li><a href="Hotchkiss_drive" title="Hotchkiss drive">Hotchkiss drive</a></li>

<li><a href="Limited-slip_differential" title="Limited-slip differential">Limited-slip differential</a></li>

<li><a href="Locking_differential" title="Locking differential">Locking differential</a></li>

<li><a href="Manual_transmission" title="Manual transmission">Manual transmission</a></li>

<li><a href="Manumatic" title="Manumatic">Manumatic</a></li>

<li><a href="Parking_pawl" title="Parking pawl">Parking pawl</a></li>

<li><a href="Preselector_gearbox" title="Preselector gearbox">Preselector gearbox</a></li>

<li><a href="Semi-automatic_transmission" title="Semi-automatic transmission">Semi-automatic transmission</a></li>

<li><a href="Shift-by-wire" title="Shift-by-wire">Shift-by-wire</a></li>

<li><a href="Torque_converter" title="Torque converter">Torque converter</a></li>

<li><a href="Transaxle" title="Transaxle">Transaxle</a></li>

<li><a href="Transfer_box" class="mw-redirect" title="Transfer box">Transfer box</a></li>

<li><a href="Transmission_control_unit" title="Transmission control unit">Transmission control unit</a></li>

<li><a href="Universal_joint" title="Universal joint">Universal joint</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Wheels and tires</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Wheel_hub_assembly" title="Wheel hub assembly">Wheel hub assembly</a></li>

<li><a href="Wheel" title="Wheel">Wheel</a>

<li><a href="Alloy_wheel" title="Alloy wheel">Alloy wheel</a></li>

<li><a href="Hubcap" title="Hubcap">Hubcap</a></li></ul></li>

<li><a href="Racing_slick" title="Racing slick">Racing slick</a></li>

<li><a href="Radial_tire" title="Radial tire">Radial</a></li>

<li><a href="Spare_tire" title="Spare tire">Spare</a></li>

<li><a href="Tubeless_tire" title="Tubeless tire">Tubeless</a></li></ul></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Hybrid</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Electric_motor" title="Electric motor">Electric motor</a></li>

<li><a href="Hybrid_vehicle_drivetrain" title="Hybrid vehicle drivetrain">Hybrid vehicle drivetrain</a></li>

<li><a href="Electric_generator" title="Electric generator">Electric generator</a></li>

<li><a href="Alternator" title="Alternator">Alternator</a></li></ul>

</div></td></tr><tr><td class="navbox-abovebelow hlist" colspan="2"><div>

<ul><li><span class="noviewer" typeof="mw:File"></span> <a href="Portal%3ACars" title="Portal:Cars">Portal</a></li>

<li><span class="noviewer" typeof="mw:File"><span title="Category"></span></span> Category</li></ul>

</div></td></tr></tbody></table></div></div><div><div class="zim-footer">

This article is issued from <a class="external text" title="Last edited on 2025-02-18" href="https://en.wikipedia.org/wiki/?title=Wheel_alignment&oldid=1276333824">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.

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