Frequently Asked Questions

Expert Insights

This FAQ page is designed to offer clarity and expert guidance on common questions related to tire failure analysis. With insights from Brian Darr, P.E., we strive to provide thorough, informed responses based on extensive experience in the field.  Have a question, not listed here?  Please contact us.

Q: What qualifies Brian Darr as an expert in legal proceedings?

One of the nation’s leading authorities in the field of tire failure analysis, Brian Darr possesses the qualifications and experience necessary for recognition as an expert in both State and Federal Courts. His comprehensive CV is available here for review.

Q: How extensive is Brian Darr’s experience in tire inspection?

With over 25 years of extensive experience, Brian Darr has conducted thorough inspections of thousands of tires, leveraging his deep expertise to deliver precise and reliable evaluations.

Q: Has Brian Darr ever been excluded from providing expert testimony?

Brian Darr has consistently maintained a record of credible and reliable testimony, resulting in no instances of exclusion as an expert witness in legal cases.

Q: Which tire inflation pressure should be used: the one on the tire sidewall or the vehicle’s tire placard?

Vehicle manufacturers invest significant effort in setting the optimal tire inflation pressure, based on rigorous testing. It is advisable to adhere to the inflation pressure recommended on the vehicle’s tire placard or owner’s manual, ensuring not to exceed the maximum pressure indicated on the tire sidewall.

Q: Is it normal for tires to lose inflation pressure over time?

Tires naturally lose approximately 1 to 2 psi per month due to air permeation through the rubber. Regular monthly checks of tire pressure are recommended by both vehicle and tire manufacturers to maintain optimal performance.

Q: Does nitrogen inflation offer significant benefits over standard air inflation?

Nitrogen inflation, a practice utilized for decades in aircraft tires, offers several benefits:

  • Stability at high temperatures.
  • Reduced air permeation due to larger molecule size, helping maintain tire pressure for longer durations.
  • Lesser oxidative degradation from reduced permeation rate and absence of oxygen, contributing to slower internal aging of tires.
  • Brian Darr of Quality Forensic Engineering endorses nitrogen inflation for these advantages.

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Submit your tire-related case online, and Brian Darr, P.E., along with our team, will promptly connect with you to provide expert analysis and professional, detailed guidance.
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Our Services

Comprehensive Tire Analysis Services

With our expert analysis, you’ll receive detailed insights and reliable testimony to support both legal professionals and industry clients.


Tire Failure Analysis

  • Comprehensive examination to determine the cause of tire failures.
  • Expert identification of manufacturing defects, wear patterns, and damage.


Vehicle Inspection

  • Detailed vehicle evaluations to assess the impact of tire failures.
  • Confirming the compatibility and fitment of tires to the vehicle.


Legal Expert Witness & Testimony

  • Thorough vehicle inspections to determine accident sequence and a tire’s involvement in the incident.
  • Familiar with 100’s of publicly available reference materials to review relativity to the subject case.


Accident Reconstruction

  • Analysis of tire failure roles in vehicular accidents.
  • Reconstruction of events to understand tire performance during accidents.


Tire Maintenance & Safety Consulting

  • Guidance on proper tire maintenance to prevent future failures.
  • Consulting on tire safety and performance for consumer and commercial clients.


Service Station Procedure Review

  • Evaluation of tire installation, rotation, and repair procedures.
  • Assessing the service history for adherence to safety standards and best practices.
Experience You Can Trust

Our Areas of Expertise

  • Automobile & Tractor-Trailer Collisions
  • Automotive Component Failure Analysis
  • Bicycle, Motorcycle & Pedestrian Accidents
  • Biomechanical Analysis & Injury Consistency
  • Black Box & ECM Downloads and Analysis
  • Boat, RV & ATV Accidents
  • Building Codes, ANSI & ASTM
  • Digital Video Analysis
  • Fire Origin and Cause Investigations
  • Guardrails, Roadside Safety & Construction Zones
  • Human Factors
  • Industrial Accidents
  • Lightning Strike & Power Surge Investigations
  • Material Fracture Analysis
  • Occupant Kinematics
  • Patent Litigation Technical Analysis
  • Plumbing Failure Analysis
  • Product & Machinery Failure Analysis
  • Retail Facility Safety
  • Slip, Trip & Falls
  • Theme Parks & Recreation Facility Safety
  • Tire Failure Analysis
  • Workplace Safety, OSHA & ADA Regulations
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