About TireSize.app
Professional tire size calculators and automotive tools built by certified mechanics, engineers, and tire industry experts. Serving 280,000+ users monthly since 2018.
Our Mission
TireSize.app was created to solve a critical problem in the automotive aftermarket: the lack of accurate, easy-to-use tire sizing tools that both enthusiasts and professionals can trust.
We believe that selecting the correct tire size shouldn't require guesswork or complicated calculations. Our mission is to provide free, professional-grade tools that ensure vehicle safety, optimal performance, and legal compliance through accurate tire fitment analysis.
"Every calculation on TireSize.app follows industry standards from the Tire and Rim Association (TRA) and European Tyre and Rim Technical Organisation (ETRTO) to ensure accuracy and safety."
Our Expert Team
James Morrison
Credentials:
- B.S. Mechanical Engineering (MIT)
- 15+ years automotive industry
- Former tire engineer at Michelin
- SAE Member since 2008
James leads our calculator development and ensures all algorithms comply with TRA/ETRTO standards. His expertise in tire dynamics and vehicle engineering powers the accuracy of our tools.
David Rodriguez
Credentials:
- ASE Master Certified (A1-A8)
- 20+ years shop experience
- Tire Industry Association (TIA) Certified
- L1 Advanced Engine Performance
David brings real-world mechanical expertise from two decades in professional repair shops. He ensures our recommendations account for practical fitment issues, safety concerns, and OEM specifications.
Sarah Kim
Credentials:
- B.S. Computer Science (Stanford)
- 10+ years automotive data
- OEM specification database expert
- API integration specialist
Sarah maintains our comprehensive vehicle and tire database covering 40+ brands and thousands of models. She ensures OEM specifications are accurate and up-to-date through continuous research and verification.
Marcus Patterson
Credentials:
- Professional racing experience (SCCA)
- 15+ years track/autocross competition
- Tire compound specialist
- Vehicle dynamics consultant
Marcus provides expert guidance on performance tire sizing, track setups, and competition applications. His hands-on racing experience ensures our performance calculators deliver real-world relevant recommendations.
Travis Johnson
Credentials:
- Commercial truck technician (CDL)
- 12+ years 4x4/overland experience
- Load capacity certification
- Suspension modification expert
Travis specializes in heavy-duty pickups, commercial vehicles, and off-road applications. His expertise ensures our truck calculators properly account for load ratings, towing capacity, and clearance requirements.
Emily Liu
Credentials:
- M.S. Electrical Engineering
- Former Tesla service technician
- 8+ years EV industry
- Battery systems expert
Emily focuses on EV-specific tire requirements including load ratings for heavy batteries, range optimization, and low-noise compounds. Her Tesla background ensures accurate recommendations for electric vehicles.
Our Quality Process
Industry Standard Compliance
All calculations follow official standards from the Tire and Rim Association (TRA) and European Tyre and Rim Technical Organisation (ETRTO). We regularly update our algorithms to reflect the latest industry specifications.
OEM Data Verification
Every vehicle specification in our database is cross-referenced with manufacturer documentation, owner's manuals, and door jamb specifications. We maintain partnerships with dealerships and service centers for accurate data.
Real-World Testing
Our team physically tests tire fitment scenarios when possible, documenting clearance issues, speedometer accuracy, and handling characteristics. This real-world data supplements our theoretical calculations.
Continuous Review
User feedback, industry updates, and new vehicle releases trigger regular reviews of our calculators and database. We actively monitor automotive forums and professional networks for emerging fitment issues.
Expert Review
All content, calculations, and recommendations undergo peer review by at least two team members before publication. Safety-critical information receives additional scrutiny from our ASE-certified technicians.
Industry Standards We Follow
🏛️ Tire and Rim Association (TRA)
The TRA publishes the official standards for tire and rim dimensions in North America. Our calculations for tire diameter, width, and circumference strictly follow TRA Year Book specifications.
🌍 European Tyre and Rim Technical Organisation (ETRTO)
ETRTO standards govern tire specifications in Europe and internationally. We reference ETRTO data for metric tire sizes, load indices, and rim width compatibility ranges.
✅ Society of Automotive Engineers (SAE)
SAE standards inform our vehicle dynamics calculations including speedometer error, gear ratio changes, and suspension geometry effects of tire size modifications.
🔧 National Institute for Automotive Service Excellence (ASE)
Our ASE-certified team members ensure all safety recommendations and best practices align with professional automotive service standards.
By the Numbers
Questions or Feedback?
Our team is here to help. Reach out with questions, suggestions, or partnership inquiries.