Sources & citations

We aggregate from a small number of authoritative sources. Each source below is the primary input for at least one data layer on this site.

• wheel-size.com — vehicle → tire fitment registry. Used as the primary scrape input for Layer 1.
• tiresize.com — secondary cross-check on fitment data.
• NHTSA UTQG database — official US source for treadwear, traction, and temperature ratings.
• EU tire-label database — dB noise, rolling resistance, wet-grip class for tires sold in Europe.
• SimpleTire / Priority Tire / TireBuyer / TyresAddict — affiliate-program data feeds, the source of live merchant prices.
• Manufacturer technical documentation — used to verify warranty mileage and approved fitment ranges.

For corrections or source-quality concerns, email hello@tirefolio.com.