Identify Wheel Positions, Columns and Units on an Alignment Report

The short answer

Every number on an alignment printout has three things attached to it: a position (which wheel or axle it belongs to), a column (which stage of the job or which reference value it represents), and a unit (how the number is expressed). Positions are normally labeled left front, right front, left rear and right rear, often shortened to LF, RF, LR and RR. Columns usually separate a before measurement, a current or after measurement, and a specification range. Units are degrees for angles such as camber and caster, while toe may be printed in degrees or as a linear distance such as inches. A value read without all three of these is not interpretable, so keep them together whenever you copy, compare or ask about a reading.

One condition changes how much the printout tells you: the before column does not automatically mean the condition the car arrived in. In Hunter Engineering's WinAlign software, for example, before measurements are saved separately and can be replaced with current measurements during the job, and report headers can be customized by the shop. Treat the before column as whatever was saved under that label, not as a complete record of the work performed.

Finding the wheel and axle positions

Left and right refer to the vehicle's own sides as seen from the driver's seat facing forward, which is the same as standing behind the car looking toward the front. This holds for both left-hand-drive and right-hand-drive vehicles. The right front is the passenger-side front wheel on a US-market car.

Reports typically arrange the four positions in one of two ways. A chart layout lists the measurement names down one side with front-axle values grouped above rear-axle values, and left and right in separate columns. A graphic layout mimics a top view of the car, with a box or bar graph at each corner. Hunter's WinAlign manual shows this second style, with left-front, right-front, left-rear and right-rear labels around the vehicle outline and axle-level figures such as total toe and thrust angle placed between or below them.

Some values belong to an axle or to the whole vehicle rather than to one wheel. These usually appear centered between the left and right columns or on their own line. If a number has no corner label, check whether it sits on the front-axle row, the rear-axle row, or a vehicle-level line before assigning it to a wheel.

What the measurement labels mean

• Camber: the inward or outward tilt of the top of the tire viewed from the front. Positive means the top leans outward; negative means it leans inward. Reported per wheel, usually in degrees.
• Caster: the forward or rearward tilt of the steering axis viewed from the side. Positive means the top of the axis leans toward the rear. Normally reported only for steered wheels, so it is often absent from the rear rows.
• Toe (individual): whether a single wheel points inward or outward relative to the vehicle's reference line. Toe-in is conventionally shown as positive and toe-out as negative. Reported per wheel.
• Total toe: the combined toe of both wheels on one axle. Reported once per axle, not per wheel.
• Thrust angle: the direction the rear axle is pointing compared with the vehicle's geometric centerline. Reported once for the vehicle, typically near the rear axle.
• Cross camber and cross caster: on reports that include them, the difference between the left and right values on the same axle. Reported once per axle.

Sign conventions are widely shared but not guaranteed on every machine. If the report has a legend or a key showing what positive means, that legend takes priority over general convention.

Separating before, current and specification columns

Most printouts place readings and reference values side by side, so the first job is to tell which columns are measurements and which are targets. Measurement columns hold what the equipment read from the car. Specification columns hold the range the readings are compared against.

• Before (sometimes Initial or As Received): the measurement saved under that label. As noted above, it may have been saved at the start or replaced later.
• Current, After or Final: the measurement at the time the report was printed.
• Specification, Spec, Range or Min / Preferred / Max: the comparison values, usually drawn from the vehicle selected in the software. Some shops configure their own specifications.
• Adjustment or Change: on some reports, a column showing the difference between two stages. Confirm whether it is calculated or entered manually before relying on it.

Header wording varies because shops can customize report headers. Rely on the actual printed heading for each column rather than assuming its meaning from position. If a column has no heading, record it as unlabeled and ask the shop what it contains.

The specification column depends on the vehicle selection printed near the top of the report, usually year, make, model and sometimes trim or suspension option. Check that this matches your vehicle. If the selection is wrong, the specification column is describing a different car, even if the measurements themselves were taken correctly.

Reading units and notation

Hunter's WinAlign documentation describes measurements in either angular or linear units, generally associating camber and caster with degrees and toe with either degrees or inches. Other equipment may also use millimeters for toe. The unit is often printed once in a column header or report footer rather than beside each number, so look in both places.

• Decimal degrees: for example 0.25°.
• Degrees and minutes: for example 0°15'. One degree equals 60 minutes, so 0°15' is the same angle as 0.25°.
• Linear toe: for example 0.06 in or 1.5 mm, representing a distance difference across the tire rather than an angle.

Do not convert linear toe to degrees yourself. The conversion depends on the reference diameter the machine uses, which is rarely printed. Record toe exactly as shown, and if no unit is visible anywhere on the page, keep the printed value and mark the unit as unconfirmed.

Always keep the sign. A minus sign that is faint, cut off or printed in a separate column changes the meaning of the reading entirely.

Asterisks, colors and graph formats

In Hunter's software, optional asterisks on a printout refer to specifications that were configured for the job, so an asterisk is a pointer to a note about the specification rather than a verdict on the reading. Other systems use symbols differently. Find the legend on the same printout before deciding what any mark means.

Hunter's manual lists several print formats: a chart summary with values in rows and columns, bar graphs showing before and current readings together, and bar graphs showing current readings only. Bar graphs usually place the reading against a shaded or marked specification band. When a bar graph and a printed number disagree visually, the printed number is the value to record. Color shading, where used, is a display aid; it does not by itself establish whether the alignment is correct or the vehicle is safe to drive.

A current-only format has no before data at all. That is a choice of format, not evidence that the readings were unchanged or that nothing was adjusted.

How to read and record a printout

• 1. Note the report source: shop name, date, and any work-order or report reference number printed on the page.
• 2. Copy the printed vehicle selection and compare it with your vehicle's year, make, model and trim.
• 3. Identify the report format: chart summary, before/current graph, or current-only graph.
• 4. Locate the four wheel positions and any axle-level or vehicle-level lines such as total toe and thrust angle.
• 5. Write down every column heading exactly as printed, including any custom wording.
• 6. Find the unit for each measurement in the column header, row label or footer.
• 7. For each measurement and position, record the value with its sign and unit under its own column. Keep before, current and specification values in separate fields.
• 8. If a column is absent, write that it is not present. Do not enter zero.
• 9. Copy any asterisks, symbols or color notes along with the legend text that explains them.
• 10. List anything unclear as a question for the shop.

Completion check: every recorded value should have a position, a column heading, a sign and a unit, or an explicit note saying one of those is missing. If any value fails that check, it belongs on your question list.

A record template you can copy

Report file / page:
Issuing shop:
Report or work-order reference:
Printed vehicle selection:

Position | Measurement | Column heading | Value (with sign) | Unit / notation | Spec column (if present) | Legend ref
---------|-------------|----------------|-------------------|-----------------|--------------------------|-----------
LF       | Camber      | Before         |                   |                 |                          |
LF       | Camber      | Current        |                   |                 |                          |
RF       | Camber      | Before         |                   |                 |                          |
...
Front    | Total toe   | Current        |                   |                 |                          |
Vehicle  | Thrust angle| Current        |                   |                 |                          |

Questions for issuer:

Hypothetical example, for illustration only: a printout uses the current-only bar graph format, shows a left-front toe reading with no unit anywhere on the page, and marks one specification with an asterisk. A correct record would note before column not present rather than zero, copy the toe value exactly with the unit flagged as unconfirmed, and copy the asterisk along with whatever the legend says it refers to. Each of those three items then becomes a question for the shop.

Questions to ask the shop

• Was the before reading saved when the car arrived, or was it re-saved later in the job?
• Is a before/current version of this report available if I received a current-only copy?
• What unit is the toe reading in, and is it per wheel or total?
• Where did the specifications come from: the equipment's vehicle database or a custom entry?
• What do the asterisks or other symbols on this report refer to?
• Which measurements were adjusted, and were any listed as non-adjustable on this vehicle?
• Does the printed vehicle selection match my exact trim and suspension?

What the printout cannot confirm on its own

An alignment report records what the equipment measured and what it was compared against. It does not show which adjustments were made, whether worn suspension parts affected the readings, or whether the specification selected is the right one for your vehicle. A before/current pair is two snapshots, not the full procedure. If a reading, column or unit matters to a decision such as a warranty claim, a tire wear concern or a return visit, get the answer from the shop that issued the report and keep their response with your copy of the printout.