Tire failure is a distinct category of commercial trucking crash claim, distinct in its evidence chain, its defendant map, and its expert requirements. A blown commercial tire at highway speed generates catastrophic crashes because the vehicle's size and momentum amplify the loss of control. The liability framework crosses the boundary between a standard negligent-maintenance claim and a potential product defect claim, and plaintiff counsel needs to assess both tracks before committing to a theory at the pleading stage.
Cases in this category appear regularly in commercial vehicle litigation and require a specific pre-suit investigation checklist that differs from the one used in standard collision cases.
FMCSA Part 393: Tire Standards as the Negligence Per Se Foundation
Title 49 C.F.R. Part 393 sets the federal equipment standards for commercial motor vehicles, including specific requirements for tires. Under § 393.75, a commercial vehicle is prohibited from operating with a tire that has any of the following conditions: tread wear indicators at or below 2/32 of an inch; any visual evidence of sidewall separation or ply separation; any cut or crack that exposes the cord; or any tire that is flat or has abnormal inflation pressure.
A violation of Part 393 constitutes negligence per se in most jurisdictions if the violation proximately caused the plaintiff's injuries. The expert's role is to examine the failed tire and opine that the pre-failure condition violated § 393.75 and that the violation was present at the time of the pre-trip inspection. If the driver performed the required pre-trip inspection and noted no defect, either the driver failed to identify an obvious condition or the failure was truly latent. Which of those is true determines whether the liability theory is negligent maintenance, negligent inspection, or product defect.
Pre-Trip and Post-Trip Inspection Duties Under Part 396
FMCSA Part 396 requires commercial drivers to conduct a pre-trip inspection before each trip and a post-trip inspection at the end of each day, completing a Driver Vehicle Inspection Report (DVIR). The DVIR must identify any defects affecting safe operation, and any identified defects must be repaired before the vehicle returns to service.
In tire failure cases, the pre-trip DVIR for the day of the crash is one of the first documents to request. If the driver reported the tire as satisfactory that morning and the tire had visible sidewall cracking or ply separation that a reasonable inspection would have detected, that creates an inference that the inspection was either not performed or was negligently performed. Cross-check the DVIR against the vehicle's maintenance log for the same tire position: if the tire had been flagged in a prior DVIR and the maintenance response was documented as inflated to spec without a physical tire inspection, that prior notice plus inadequate response is a strong negligence foundation.
Preserving the Failed Tire and the Spoliation Risk
The failed tire is the single most important piece of physical evidence in a blowout case. It establishes the failure mode, the pre-failure condition of the tread and sidewall, and whether the failure originated in manufacturing, maintenance, or road hazard impact. The preservation letter must specifically identify and demand: (1) the failed tire itself including any tread or sidewall fragments recovered at the scene; (2) the wheel and hub assembly on which the tire was mounted; (3) the maintenance records showing the tire's history at that axle position; and (4) any TPMS data from the vehicle's onboard diagnostics.
Commercial vehicles often pass through inspection stations after a crash where tires are routinely removed and discarded. If the carrier does not receive a preservation demand before the vehicle is returned to a maintenance shop, the failed tire may be gone within 24 to 48 hours. Courts have found spoliation where carriers discarded the failed tire after reasonable anticipation of litigation attached, and adverse inference instructions in those situations have been case-determinative in subsequent trials.
Expert Analysis: Failure Mode and Responsibility
A tire forensics expert examines the failed tire's physical condition to determine the failure mode. A belt-edge delamination caused by cord-to-belt interface degradation is typically a manufacturing or retreading defect. A sidewall fatigue failure caused by chronic underinflation over the tire's operational life is a maintenance and inspection failure. An impact-initiated failure from road hazard contact that could not have been detected or prevented reduces or eliminates carrier liability. The failure mode determination directly dictates which defendants stay in the case.
For product defect claims involving retreaded tires, the retreader's bonding compound, curing process, and pre-retreading inspection of the casing are all subject to discovery and expert analysis separate from the original manufacturer. Do not drop any defendant based on failure mode evidence alone until the expert has completed a physical examination of the failed tire. Preliminary crash-scene photographs are not sufficient to eliminate the product theory at the pleading stage.
Defendant Identification and Coverage
The carrier is the primary defendant in a negligent-maintenance theory. If the tire was operated by an owner-operator under a lease with a motor carrier, the lease terms and the FMCSA statutory employee rules determine whether the motor carrier bears responsibility for the equipment's condition regardless of the lease agreement's indemnification language. The retreading facility or the OEM tire manufacturer may be additional defendants if the failure mode evidence supports a product defect theory. Name all potential defendants in the original complaint; dismissal on the evidence is preferable to a subsequent motion to add a defendant after the statute of limitations has run on a product claim.