VIN-Based Tire Specification Lookup
Use your VIN to find the factory tire size. Use the calculator below. Results update as you type.
How the VIN-Based Tire Specification Lookup Works
This lookup works by decoding the 17-character Vehicle Identification Number (VIN) to find the exact build record and its tire specification. The VIN pins down model, year, plant and options.
- Find the VIN on the dashboard at the windshield, the door jamb or the registration.
- Enter all 17 characters.
- Let the lookup decode the maker, model, year and trim.
- Read the factory tire size from the matching fitment record, where the database supports that vehicle.
The Formula
The formula splits the VIN into 6 sections and matches them against a fitment database.
VIN = WMI (1–3) + VDS (4–8) + Check (9) + Year (10) + Plant (11) + Serial (12–17) Fitment = Database[WMI, VDS, Year]Position 9 is a check digit computed from the other 16 characters, which catches typing errors. Worked example: a VIN with "R" in position 10 is a 2024 model year.
Conversion Table
The conversion table explains the 17 VIN positions and how each one feeds a tire lookup. Positions 1–8 and 10 do most of the work.
The VIN does not encode the tire size directly. It encodes the vehicle configuration, which maps to a tire size in the maker's records.
| Position | Name | Example | Use in Tire Lookup |
|---|---|---|---|
| 1–3 | World Manufacturer Identifier (WMI) | 1FT | Maker and vehicle type |
| 4–8 | Vehicle Descriptor Section (VDS) | FW1E8 | Model, body, engine, GVWR class |
| 9 | Check digit | 5 | Confirms the VIN is valid |
| 10 | Model year | R = 2024 | Year-specific fitment |
| 11 | Assembly plant | F | Plant-specific options |
| 12–17 | Production sequence | A12345 | Build record with trim and wheel package |
What Is the VIN-Based Tire Specification Lookup?
The VIN-Based Tire Specification Lookup is a tool that uses the VIN to retrieve the factory tire size and specification for one specific vehicle. It removes guesswork when a model had many trims and options.
The VIN follows the ISO 3779 standard and is required on all road vehicles sold in the US since 1981. Supported records depend on the maker and region.
Common Uses
This lookup has 4 uses: exact fitment, fleet records, insurance claims and parts ordering.
- Get exact fitment: Avoid trim confusion.
- Build fleet records: Record tire specs per vehicle.
- Support insurance claims: Confirm original equipment.
- Order parts: Use the VIN for wheels and TPMS sensors.