In most fleets, tire wear is estimated by eye during the daily inspection: the driver takes a look, the mechanic checks in passing, and everyone assumes the tire still has some life in it. That estimate costs money in both directions. A tire replaced too late has already caused irregular wear across the set or a geometry problem. One replaced too early is money thrown away.
This guide explains how to measure properly, which methods exist, how often to do it and why measurement discipline changes concrete operational decisions.
Visual estimation has three fundamental problems.
It is subjective. Two people looking at the same tire reach different conclusions. One sees it as worn, the other sees it as still usable.
It detects late. Visible wear is already advanced wear. The first millimeters of loss, which are precisely where there is still room to rotate and extend service life, cannot be seen with the naked eye.
It leaves no record. The estimate is not written down. It cannot be compared between inspections, you cannot project when a replacement will be needed and you cannot plan the purchase.
Objective measurement solves all three: it gives a consistent number, detects early and is recorded for historical analysis.
Manual tread depth gauge. A simple, inexpensive tool. It rests on the tread and shows the remaining depth in millimeters. It requires someone to do it, typically at three points on each tire: center, outer edge and inner edge. It takes a couple of minutes per vehicle.
Tread wear indicator. Almost all modern tires have a built-in indicator: a rubber bar lower than the grooves. When wear reaches the indicator, it is time to replace the tire. It serves to confirm the limit has been reached, not to monitor how wear evolves.
Pressure and wear sensors. Systems that report continuously without human intervention. High accuracy and high cost. They are justified in heavy fleets where each tire is worth a lot.
The standard combination in mid-sized fleets is a depth gauge for periodic monitoring, the wear indicator for verification in the checklist, and sensors only on the units where the investment pays off.
It depends on the type of vehicle and how intensively it is used.
Light urban use. Monthly measurement. Wear is slow and significant changes between one measurement and the next are rare.
Mixed use. Measurement every two weeks. It is the balance between effort and the ability to detect changes in time.
Heavy use. Weekly measurement. Wear is fast and delayed detection is expensive.
Units with known alignment or suspension problems. Weekly even if use is light, because wear can be irregular and accelerated.
Each measurement is recorded with the date, odometer reading and values per point. With three accumulated measurements you can already project when the limit will be reached and plan the purchase.
A useful measurement records more than one number:
With that data, patterns emerge. If the center is more worn than the edges, the tire is overinflated. If the edges are more worn than the center, it is underinflated. If one edge is more worn than the other, there is an alignment problem. And the trend against mileage tells you how much is lost every thousand kilometers, which is what lets you project the end of service life.
Rotation. When the difference in remaining life between tires becomes significant, it pays to rotate the most worn ones to the positions where they wear less. It extends the life of the whole set.
Replacement. When the remaining depth reaches the country’s legal minimum or the operational minimum defined by the fleet, which is usually stricter when operating with loads.
Root-cause investigation. When wear is abnormally fast or irregular, open an alignment, suspension or pressure diagnosis before spending on a new tire that will get ruined just the same.
Without numeric measurement, none of the three decisions is made on solid criteria. They are all made on gut feeling.
A fleet that estimates instead of measuring pays in three ways at once. It replaces tires too early because they look worn. It replaces others too late, and the damage spreads to the rest of the set. And it misses retreading opportunities because it did not identify the right moment to pull the casing.
None of the three shows up on an invoice: they show up in the annual tire spend, which ends up higher than it should be without anyone being able to explain why.
In the Tires module:
Do you know how much service life is left on each tire in your fleet?
With VEC Fleet every tire has its own history of wear, rotations and retreads, plus its cost per kilometer by unit.
