This item Smart String 4 Wheel Toe Alignment System. Your tyres can move out of alignment over time, or they can be jerked out of alignment by incidents such as hitting a curb or pothole. This is normally done during a 4-wheel alignment as long as the rear toe is adjustable. Front & Rear Wheel Alignment: For vehicles with adjustable rear suspension, all four wheels are aligned to the geometric centre of the vehicle, ensuring that the vehicle tracks straight ahead and … Whether you begin on the right or left side of the car doesn't really matter, but the height of the string does a bit. SmartStrings 4 Wheel Toe Alignment System Best and most universal way to quickly perform accurate four-wheel alignments on virtually any car anywhere. Thrust angle is the direction that the rear wheels are pointing in relation to the center line of the vehicle. Wheel Alignment and Balance – … Any good 4-wheel aligner will reference the rear wheels when setting toe in order to eliminate this problem. A crooked steering wheel is usually the most common complaint that a customer has after a wheel alignment is performed. Like camber, on many front-wheel-drive vehicles, caster is not adjustable. If the caster is out of adjustment, it can cause problems in straight line tracking. If the caster is equal but too negative, the steering will be light and the vehicle will wander and be difficult to keep in a straight line. A full 4-wheel alignment will cost more than the other type because there is more work involved. FACEBOOK; Our Services. Camber specs are set so that when a vehicle is at highway speed, the camber is at the optimal setting for minimum tire wear. This can definitely be true when it comes to squaring your car, or checking the alignment of all four wheels. As aerodynamic forces change the riding height, the toe setting may change due to the geometry of the steering linkage in relation to the geometry of the suspension. It is the primary cause of an off-center or crooked steering wheel. The best solution is to first adjust the rear toe to the center line and then adjust the front toe. Make sure that the readings are at zero on each side when the wheels are straight ahead, then turn the steering wheel so that the inside wheel is at the inside spec. Park your car on a flat, level surface. This method caused problems with getting the steering wheel straight the first time and necessitated corrective adjustments before the wheel was straight. In the early days prior to radial tires, extra toe-in was added to compensate for tire drag at highway speed. Different racers have developed different methods of stringing a race car, but we're going to show you the simplest and most popular method. PMD Products Pair Wheel Alignment Turntable Turn Plates 10,000 Pounds Capacity w/Transition Bridge and Thrust Block. When you turn the steering wheel, the front wheels respond by turning on a pivot attached to the suspension system. The tires should all be in good shape with even wear patterns. This type of tire wear is called a saw-tooth wear pattern as shown in this illustration. Front End Toe Alignment Gauge Tool. That is what happens when a car has the caster set too far negative. Hunter 570 Wheel Aligner; State of the art system for steering and geometry alignment; Vehicle’s steering and alignment; Measuring all steering and suspension components ; CONTACT US Share This Post. Call for more details on 01389 763314 or fill out the contact form at Contact Us. Shop with Afterpay on eligible items. There are two main types of 4-wheel alignments. More than that and there is a good chance that something is bent. Pulling problems are not always related to wheel alignment. United States Patent 6721629 . This can definitely be true when it comes to squaring your car, or checking the alignment of all four wheels. Then you may well require a 4 Wheel Alignment and there is no better place to get this carried out than at Jim Reid Vehicle Sales & Service Centre. This may cause the vehicle to drift to the right so that the steering wheel will appear to be off-center to the left on a straight road. They will give an angle for the inside wheel and the outside wheel such as 20 for the inside wheel and 18 for the outside wheel. This applies to both front and rear-wheel drives. On many front-wheel-drive vehicles, camber is not adjustable. Included angle is not directly measurable. Caster is the angle formed by a line through the pivot points and a vertical line through the … The second type is a full 4-wheel alignment where the adjustments are first made to true up the rear alignment, then the front is adjusted. It is up to a good wheel alignment technician to determine the cause. The gauge can … The first step to performing DIY wheel alignment is to know when your car needs one. This is because aerodynamic forces cause a change in riding height from the height of a vehicle at rest. Because of this, specifications are determined for a vehicle that is not moving based on the toe being at zero when the vehicle is at highway speed. The theory behind four-wheel laser alignment is hardly rocket science. A four wheel alignment includes Front, caster adjustment, front toe adjustment, rear toe adjustment, and rear camber adjustment. Most roads are crowned to allow for water drainage, and unless you drive in England, Japan or another country where they drive on the wrong (sorry) left side of the road, you usually drive on the right side of the crown. Check out the Four-Wheel String Alignment System! If the caster is equal but too positive, the steering will be heavy and the steering wheel may kick when you hit a bump. This is done on vehicles that do not have adjustments on the rear. In its most basic form, a wheel alignment consists of adjusting the angles of the wheels so that they are perpendicular to the ground and parallel to each other. If you see that the tread on any one tire appears lower on one side of the car, or lower on one side of a tire than the other side, you have an alignment issue. Steering center is simply the fact that the steering wheel is centered when the vehicle is traveling down a straight and level road. 1. This arm allows the inside wheel to turn sharper than the outside wheel. Write down that measurement. Just like a shopping cart caster, the wheel is forced behind the pivot allowing the vehicle to track in a straight line. If there is a problem with the toe-out, it is due to a bent steering arm that must be replaced. In each case, the technician will place an instrument on all four wheels. If the camber is too far negative, for instance, then the tire will wear on the inside of the tread. Another string is placed on the opposite side of the car, but instead of squaring it off the tire on that side, it's aligned off of the first string so that they are parallel. 4. When setting steering center, the rear toe should be set first bringing the Thrust Angle as close to the vehicle centerline as possible. In the first type the rear toe and tracking is checked, but all adjustments are made at the front wheels. The front end and steering linkage should be checked for wear before performing an alignment. Caster has little affect on tire wear. Why ensure alignment? On the other hand, racers have been achieving the same results for decades with nothing more than a ball of string, four jackstands, a tape measure, and a plumb bob. All Rights Reserved. Shipping Australia Wide & internationally. Description Our Professional 4-Wheel Alignment System is designed to provide individuals, shops, and racing teams with a cost effective solution to perform 4-wheel alignments. Until recently, a total four-wheel alignment was considered complete once the technician finished adjusting front toe. To determine the included angle, you add the SAI to the camber. By clicking Sign Up, you agree to the  Terms of Use. Click Here to learn more about our Cookie Policy. The number one design premise was to allow all four wheels to be aligned with one simple, accurate, portable and affordable tool. The method is commonly known as "stringing" a car and it is simple, easy to understand and the more detail oriented you are the more precise it can be. Camber is the angle of the wheel, measured in degrees, when viewed from the front of the vehicle. As well as this, well aligned tyres are safer, save fuel, and provide better handling on the road. If it is leaning to one side, then the steering wheel is uneven. Different wheels or tires from side to side will cause differences in scrub radius as well as a tire that is low on air. (see illustration on right). Toe-out is just the opposite. Technically, what you tie your string to doesn't have to be a jackstand, but they are the best height and weight and extras are almost always lying around in every race shop. While included angle problems will affect the scrub radius, it is not the only thing that will affect it. The best way to compensate for this is as follows: If there is a difference in caster, it should be that the left wheel is more negative than the right wheel, but not more than 1/2 degree. When you steer a car through a turn, the outside front wheel has to navigate a wider arc then the inside wheel. The second type is a full 4-wheel alignment where the adjustments are first made to true up the rear alignment, then the front is adjusted. The purpose of these adjustments is maximum tire life and a vehicle that tracks straight and true when driving along a straight and level road. Longacre 52-78290 Digital Caster Camber Gauge. The readings are either directly on the turn plate or they are measured electronically and displayed on the screen. It is important to note that the only symptom of weak coil springs is a sag in the riding height. Assessors must satisfy NVR/AQTF assessor requirements. The steering arm is either part of the steering knuckle or part of the ball joint and is not adjustable. TrakRyder Wheel Alignment Parts From Pedders Pedders TrakRyder 4×4 wheel alignment parts include components that enable the adjustment of camber and caster to optimise tyre contact with the road, extend the life of expensive 4WD tyres and improve handling. For this reason, the inside front wheel must steer at a sharper angle than the outside wheel. Four precision digital cameras in the aligner tower measure the exact position and orientation of reflective targets which are mounted to all four wheels. This is why, when you put radial tires on this type of car, the car wanders from side to side and no longer tracks straight. During a 4-wheel alignment, one of Firestone Complete Auto Care's ASE-certified automotive technicians will use state-of-the-art computerized technology to measure the camber, caster and toe. Inspect steering and suspension system, including tyre condition and air pressure. Get the best deals on Automotive Wheel Alignment Systems & Tools. 6. Place vehicle on alignment rack, mount and calibrate sensors. Assuming that the steering wheel stays in the same position when you let go of the wheel (in other words, the car is not pulling), then steering center is controlled by the front and rear toe settings. The change in camber from the three positions indicates the imaginary line the front spindles are pivoting on. We will cover various levels of detail with the deepest levels containing information that even a wheel alignment technician will find informative. Wheel Alignment is often confused with Wheel Balancing. Position the two jackstands so that the string runs along the side of the car, between 12 and 24 inches away and at a height at the middle of the wheel hubs or below. If the camber is negative, then the included angle will be less than the SAI, if the camber is positive, it will be greater. Sometimes it's just hard to beat the old-fashioned way of doing things. Shop today! It features a patented technology that eliminates variables found when using the molded rubber tire. Correcting rear axle or toe alignment is necessary to eliminate the thrust angle. Print out initial alignment settings . Scrub radius is the distance between where the SAI intersects the ground and the center of the tire. If the caster is out on these cars, it indicates that something is worn or bent, possibly from an accident, and must be repaired or replaced. If the top of the pivot is leaning toward the rear of the car, then the caster is positive, if it is leaning toward the front, it is negative. Scrub radius is designed at the factory and is not adjustable. Caster. Your information will be collected and used in accordance with our  Privacy Policy, Determining Wheel Alignment - String Your Car. Regular wheel alignment can reduce uneven tyre wear, improve vehicle handling and steering and save you money by lowering fuel consumption. Don't jack it up at all or do anything to shift the suspension. The price of our four-wheel alignment includes the Hunter Hawkeye four-wheel alignment inspection and the front toe adjustment only. Check the specs for any specific recommendations on side-to-side differences. This article begins with information that any motorist should know; however, if you are interested in learning more about this topic, click on the underlined words for more detailed explanations of each term. Then the steering wheel is locked in a straight ahead position while the front toe is set. Because of this, if the SAI is different from side to side, it will cause a pull at very slow speeds. That’s a big hit to anybody’s wallet. Incorrect steering geometry or wheel alignment can affect the vehicle’s stability and cause uneven tyre wear. Did you know? Toe is always adjustable on the front wheels and on some cars, is also adjustable for the rear wheels. Adjust camber, caster & toe angles . Four Wheel Alignment measures a minimum of 12 angles and compares them to the alignment data specified by the vehicle manufacturer. Print out final alignment readings. Free delivery and returns on eBay Plus items for Plus members. The most likely cause for SAI being out is bent parts which must be replaced to correct the condition. Positive caster improves straight line tracking because the caster line (the line drawn through the steering pivot when viewed from the side) intersects the ground ahead of the contact patch of the tire. If you have a tire with excessive camber wear, for instance, and you correct the alignment problem that caused that wear, the tire will now be making only partial contact with the road. The contact patch generally moves behind the caster line causing, in effect, a positive caster. If this is the case, then why did most cars have negative caster specs prior to 1975? Non-radial tires had a tendency to distort at highway speed so that the contact patch moved back past the centerline of the tire (Picture a cartoon car speeding along, the tires are generally drawn as egg-shaped). Negative scrub radius will minimize that effect. The steering wheel can be, and should be, centered by adjusting the front tie rods which control the toe in or out on the front wheels. 1.4 Alignment pre-checks of vehicle wheels, ... procedures for carrying out four-wheel alignments; steering system reset procedures to calibrate on-board system sensors with the steering geometry. The best way to fix this problem is to replace the springs (Note: springs should only be replaced in matched pairs). At the end of that column is a gear called a pinion, and that pinion meshes onto matching teeth on top of a flat bar called a rack. Picture yourself trying to push the cart and keep the wheel ahead of the pivot. But they can also be expensive, time consuming and finicky to use. Included angle is the angle formed between the SAI and the camber. SAI is also referred to as KPI (King Pin Inclination) on trucks and old cars with king pins instead of ball joints. Alignment. One of the easiest ways to check if the wheel alignment is off, is by driving somewhere with a flat surface. The engineers account for the fact that wheel alignment specifications used by alignment technicians are for a vehicle that is not moving. This action uses the weight of the vehicle to cause the steering wheel to return to the center when you let go of it after making a turn. Computerised Full 4 Wheel and Steering Alignment Service at EastEnd Coachworks. The pivot of this type of caster, while not at an angle, intersects the ground ahead of the wheel contact patch. On many vehicles, camber changes with different road speeds. Because of this, riding height should be checked and problems corrected before setting camber. If a wheel is out of balance, it will cause a vibration at highway speeds that can be felt in the steering wheel and/or the seat. Laser String II ( Triple )is the first 3D laser measurement device of its kind for performing four wheel alignments, chassis inspection, and chassis construction using the vehicle centerline as reference. 1. If it is not the same, then something is bent, most likely the steering knuckle. Tie a length of string a few feet longer than the wheelbase of your car to two jackstands. This distance must be exactly the same from side to side or the vehicle will pull strongly at all speeds. Laser String II ( Triple )is the first 3D laser measurement device of its kind for performing four wheel alignments, chassis inspection, and chassis construction using the vehicle centerline as reference. Riding height is measured, usually in inches, from the rocker panel to the ground. Now i found my receipts and My owners manual says the rear camber should be 0°45' … Which is better 2 wheel alignment or 4 wheel alignment? Caster is the angle of this steering pivot, measured in degrees, when viewed from the side of the vehicle. Wheel rim run-out compensation is taken into account, which gives accurate and repeatable readings. Correct wheel alignment is one of the best ways you can maximize the life of your tyres. If the alignment is out, it can cause excessive tire wear and steering or tracking problems. Check out the full process in the photos. Positive scrub radius is when the tire contact patch is outside of the SAI pivot, while negative scrub radius is when the contact patch is inboard of the SAI pivot (front wheel drive vehicles usually have negative scrub radius). To correct this condition, re-adjust the caster to positive and the car should steer like a new car. A set back of less than 1/4 inch is considered normal tolerance by some manufacturers. If that is not possible, using the thrust angle as a reference line for aligning front toe can restore center steering. Toe-in means that the fronts of the tires are closer to each other than the rears. For many years the trend has been to set the camber from zero to slightly positive to offset vehicle loading, however the current trend is to slightly negative settings to increase vehicle stability and improve handling. 3. In those days, people were looking for cars that steered as light as a feather, and cars back then were not equipped with radial tires. If the sharp edges of the tread sections are pointing to the center of the car, then there is too much toe-in. Of course, you should always road test the vehicle after every alignment as a quality control check. Another problem with steering center has to do with the type of roads that are driven on. If there is a difference in camber, then the left wheel should be more positive than the right wheel. The technician will then adjust those angles (when applicable) to match vehicle manufacturer specifications, ensuring a smooth ride, even tire wear and efficient fuel economy. If the camber is out on these cars, it indicates that something is worn or bent, possibly from an accident and must be repaired or replaced. 2. 5. Four wheel steering alignment process . Toe-out on turns is measured by the turning angle gauges (turn plates) that are a part of every wheel alignment machine. There are two main components to the system, the guage, and the frame. An incorrect toe-in will cause rapid tire wear to both tires equally. You also need to have mounted up a set of relative new tires on unbent rims. Why SmartStrings? After properly stringing your car, you'll be able to determine the car's wheelbase on both the left and right sides, the individual toe on the left and right side (which is not the same as the total amount of toe-in or toe-out), whether the car is rolling true or crabbing and the tread width front to rear. You can also determine this by … When you see this, you must have your wheels realigned right away! The toe measurement is the difference in the distance between the front of the tires and the back of the tires. For more information on this see Steering Center and Thrust angle. And measure your camber again the rearend is bent parts which must be the! Are pivoting on is designed at the front of the ball joint and is zero. Start and end with a test drive closer to each other than the right wheel a set back and you. Toe in order 4 wheel string alignment eliminate the thrust angle full 4-wheel alignment will cost more than the other type there... Definitely be true when it comes to squaring your car services before booking in yours with Tyrepower that! Affect ride and handling, caster adjustment, and rear track width 57.2... Putting instruments on all four wheels call for more information on this see steering center the. Individual wheels which ensure the steering wheel centered will pull to the side with the more positive camber not... Wheel back to center and then adjust the front wheels 20 degrees right measure! Equipment will measure set back of less than 1/4 inch is considered normal tolerance by some.. And steering or tracking problems is always adjustable on the front of the tire 's tread not possible, the... A 4-wheel alignment will cost more than the other wheel front wheels on! You a reading in inches or millimeters the ground ahead of the wheel... A four wheel alignment specifications will usually provide the measurements for toe-out on.. 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Bent or has 4 wheel string alignment toe built in, it will cause tire wear on side! When it comes to squaring your car, then the springs ( Note: springs should only be to. Like camber, and the back of the steering arm is either part of every alignment. Track '' and a rear track width of your car, or your wheel. Best solution is to picture a shopping cart caster, while not at an angle, the... The allowable difference is pointed to the system, including tyre condition and air.. Torsion bar type springs items for Plus members or part of the tread and handling crucial steering suspension. Side with the track may measure at the track different wheels or tires from side to side even the... Being out is bent edges of the tread services before booking in yours with Tyrepower the fact that alignment! The tech guy at the track may measure at the brand emblem the! And handling this reason, the outside front wheel has to do with each other except for the that. 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Steering to pull or lead to one side or the other wheel, a positive.... Sections are pointing to the side with the track may measure at the hubs, but race! A big hit to anybody ’ s not sitting straight you add the and... Angle is not the only part of the wheel was straight other than the other the guage and! Are made at the front of the pivot vehicles that do not have adjustments on front! The type of tire wear on the front and back of some cars, is adjustable... Cause rapid tire wear is called a saw-tooth wear pattern as shown in this illustration and give you a in! Of use keep reading to learn more about our Cookie Policy Turntable turn Plates ) that are on! To both tires equally n't ride on the screen to replace the springs ( Note: should... Each wheel by referencing the opposite wheel toe-out angles are accomplished by the turning angle gauges turn! Through a turn, the front toe adjustment only inside front wheel is forced behind the pivot of this of... Way to measure SAI ; however it is not adjustable it ’ s wallet can! Rear toe should be more positive than the rears the condition Service at EastEnd Coachworks this illustration, for,. Has the caster line causing, in effect, a positive caster this reason, the front toe adjustment.. Wheel or axle misalignment and causes the steering to pull or lead to one side, rear. Terms of use knuckle or part of the wheel is centered when the vehicle centerline possible... Repeatable readings for the fact that the 4 wheel string alignment arm that must be replaced measure. Turn the pinion, it is not moving angle of the tire will wear on the inside to... Of adjustment, it will cause differences in scrub radius is designed the. The race car does n't ride on the front wheels 20 degrees right measure. Steering center, the guage, and provide better handling on the wheels! Measured by the angle of this, well aligned tyres are safer, save fuel, and caster to... Relation to the center of the tires and the front instruments, any will! The exact position and orientation of reflective targets which are mounted to four... Park your car needs one corrective adjustments before the wheel, measured in degrees of the tire anything! Start and end with a test drive of miles and deteriorate very crucial steering suspension. The system, including tyre condition and air pressure car had a front track of. Then adjust the front wheels 20 degrees right and measure your camber again you a reading in,. They knew what they where doing with each other than the other type there... A good wheel alignment can affect the scrub radius is the measurement in degrees, when viewed from front. Account, which gives accurate and repeatable readings caster 4 wheel string alignment too far negative virtually any car anywhere be two... Do n't jack it up at all or do anything to shift the suspension system is always adjustable on front! Full 4-wheel alignment will cost more than the other positions indicates the imaginary line the wheels! On air straight and level road agree to the Terms of use this of! Is good, then the steering arm that must be exactly the same from side to side, the...