Tire Size Input Validator
Check that a tire code is typed the right way. Use the calculator below. Results update as you type.
How the Tire Size Input Validator Works
This validator works by checking a typed size against 5 rules: required fields, separators, value ranges, step sizes and notation type. It returns Valid, Corrected, Warning, Invalid or Redirect.
- Type or paste a size, for example 225-45-17.
- Let the validator find the width, aspect and rim fields.
- Read the result: Corrected to 225/45R17.
- Fix any field marked Warning or Invalid before using the size elsewhere.
The validator accepts prefixes (P, LT, ST), service descriptions (91V) and flotation notation (33x12.50R15).
The Formula
The formula is a pattern match: Width / Aspect Ratio + Construction + Rim, with each value checked against a range.
Pattern: [P|LT|ST|T] Width / Aspect [Z] R Rim [Load][Speed] Width: 125–395 mm, ending in 5 Aspect: 20–90, multiple of 5 Rim: 10–30 in (whole), or 16.5 / 17.5 / 19.5 / 22.5 / 24.5 inFlotation inputs follow a second pattern: Diameter x Width R Rim, with diameter 23–44 in. Any input that matches the bicycle pattern (for example 700x25c) is redirected.
Conversion Table
The conversion table shows 12 sample inputs and the result the validator returns. Inputs range from a clean 225/45R17 to a bicycle marking that belongs on another tool.
Rows marked Corrected show automatic fixes such as missing slashes and dashes. Rows marked Warning show values that parse but do not match sizes sold for passenger cars.
| Input | Result | Reason |
|---|---|---|
| 225/45R17 | Valid | Width, aspect and rim present; values in normal range |
| 225/45/17 | Corrected to 225/45R17 | Missing construction letter R |
| 225-45-17 | Corrected to 225/45R17 | Dashes used as separators |
| 22545R17 | Corrected to 225/45R17 | Missing slash between width and aspect |
| 225/43R17 | Warning | Aspect ratios are sold in steps of 5 |
| 227/45R17 | Warning | Section widths end in 5 (225, 235) |
| 225/45R17.5 | Warning | 17.5 in rims are for trucks and trailers |
| 225/45 | Invalid | Rim diameter missing |
| P225/45R17 91V | Valid | Service type and service description accepted |
| 33x12.50R15 | Valid | Flotation notation detected |
| 33x12.50R15LT | Valid | LT suffix accepted on flotation sizes |
| 700x25c | Redirect | Bicycle marking; use the bicycle decoder |
What Is the Tire Size Input Validator?
The Tire Size Input Validator is a tool that checks tire size notation for missing fields, wrong separators and impossible values. Typed sizes from invoices, spreadsheets and forums often contain errors such as 225/45/17 or 22545R17.
The validator cleans these entries into a standard format. A clean format means every calculator on the site reads the size the same way.
Common Uses
This validator has 4 uses: cleaning spreadsheets, checking orders, catching typos and preparing batch files.
- Clean spreadsheets: Standardize hundreds of typed sizes.
- Check orders: Confirm a size before purchase.
- Catch typos: Spot widths or aspect ratios that do not exist.
- Prepare batch files: Validate records before running batch calculations.