Automated Tire Tread
Depth Monitoring for Fleets.
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Visit the website for the Franklin Lab at Duke University for an expansive list of publications. See:

J. B. Andrews, C. Cao, M. Brooke, and A. D. Franklin, “Noninvasive material thickness detection by aerosol jet printed sensors enhanced through metallic carbon nanotube ink.IEEE Sensors Journal, vol. 17, pp. 4612-4618, 2017.

J. B. Andrews, P. Ballentine, J. A. Cardenas, C. J. Lim, N. X. Williams, J. Summers, M. Stangler, D. Koester, S. A. Cummer, and A. D. Franklin, “Printed electronic sensor array for mapping tire tread thickness profiles.” IEEE Sensors Journal, (in press).

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Tyrata DOS – Automated Tread Depth Monitoring


Tyrata IntelliTread® Tread Wear Sensor


What is the DOS?
The DOS, Drive-Over System, is a speed bump-like unit that measures tire tread wear when a vehicle drives over a speed bump-like unit. DOS is linked to, a cloud-based data analytics platform to inform service and depot managers about the actual condition of their tires in real time. The system fully automates tread depth measurements and analytics needed for efficient tire-management and safe vehicle operation.

How much does the DOS cost?
The DOS is provided to customers via a data subscription model. The solution has no hardware cost; instead users pay a monthly fee based on the number of tires in their fleet. The number of times a particular vehicle drives over the DOS does not impact cost. Maintenance and repair of the DOS is covered by the subscription fee.

How big is the DOS?
The DOS resembles a speed bump. It is 2 inches in height and 27 inches across. The width can be adjusted to match the width of vehicles it is monitoring (e.g., cars vs. commercial 18-wheelers)—typically 10 to 12 feet. It comes with a separately mounted pedestal (called a “hub”) that houses electronics and an RFID reader.

How is the DOS installed?
The DOS is placed directly on the service lane pavement. Wiring runs beneath the DOS panels and directly to the hub. Each DOS panel (high-density polyethylene, plastic) is mounted to the floor using concrete anchor bolts. As few as four bolts can be used to affix the DOS to the pavement. Separate bolts affix the hub post to the pavement. One wall plug (standard two-phase AC power) and an accessible WiFi network are the only utilities required.

How long does it take in install?
Installation can typically be completed in 2-3 hours.

Can it be installed outside?
Yes, installation can be outside. The system is designed to withstand wind, rain, snow and ice. Care should be taken to avoid hitting the DOS with a snow plow or other heavy snow clearing equipment.

Will rain, snow or mud affect the measurements?
No. Unlike systems that use lasers and/or cameras to measure tread, the DOS uses solid-state sensors that are unaffected by these conditions. Ice or snow packed in the grooves of the tire will not affect readings. Note that a build-up of snow or ice on top of the DOS should be avoided as this will affect measurement accuracy.

How accurate is the DOS?
Studies have shown that the DOS has a Mean Absolute Error (MAE) of 0.5 mm when tread depth is under 8 mm. Above 8 mm in residual tread depth, the MAE is 1.0 mm.

How does the DOS track my tires?
The DOS includes RFID technology to track the vehicles. An RFID tag (roughly the size of a stick of gum) is placed on the vehicle. Each time the vehicle drives over the DOS, an RFID reader mounted on the hub picks up the tag and then associates each axle (and tire) with the correct vehicle.

How is my data reported?
Data is reported in a portal at Each time a vehicle drives over the DOS, a tread reading is reported to the portal and presented graphically for easy analysis. Readings are typically presented within seconds after the measurement is taken. Each data point is color coded (red, yellow, green) for quick assessment. Historical tread wear for each tire can be viewed for a more detailed understanding of the tire’s history and performance. Data can be downloaded in various file formats or through an application programming interface (API).