Tire Size Input Validator
Check whether a tire size is written correctly. Validate metric, LT and flotation notation, required fields and realistic value ranges.
Check size notation and required fields.
Tire Size Input Validator: Tire Size Inputs
Compare two tire sizes here. Use the formulas and reference tables below for this tool's specific calculation.
How Tire Size Input Validator Works?
The Tire Size Input Validator works by matching the entered text against the metric and flotation size patterns and checking each field against a valid range. The check runs in 4 steps.
Normalize the text
The validator removes extra spaces and converts dashes, spaces and lowercase letters into standard notation.
Match a pattern
The validator tests the text against metric (W/AR R Rim) and flotation (D x W R Rim) patterns.
Check each field
The validator confirms width 125–405 mm, aspect ratio 20–85 in steps of 5, and rim 10–26 in.
Report the result
The validator returns Valid, Warning or Error with a message for each field.
Tire Size Input Validator Formula
The Tire Size Input Validator rule is Valid = pattern match AND every field inside its allowed range.
[P|LT|ST|T]? WWW / AA [R|ZR|D|B] RR [LI SR]?DD x WW.WW R RR [LT]?125 ≤ W ≤ 405 and W mod 10 = 520 ≤ AR ≤ 85 and AR mod 5 = 0- W
- Section width (mm)
- AR
- Aspect ratio
- RR
- Rim diameter (in)
- LI SR
- Optional load index and speed rating
Worked example
The entry "225 45 17" fails the pattern test. The validator normalizes the entry to 225/45R17 and confirms width 225 (ends in 5), aspect ratio 45 (multiple of 5) and rim 17 (inside 10–26).
Tire Size Input Validator Conversion Table
The Tire Size Input Validator conversion table shows 10 sample entries and how the validator classifies each one.
| Input | Result | Reason |
|---|---|---|
| 225/45R17 | Valid | Metric passenger size |
| 225/45 R17 94W | Valid | Size + service description |
| P225/45R17 | Valid | P-metric prefix |
| LT265/70R17 121/118S | Valid | Light truck with single/dual load index |
| 33x12.50R17LT | Valid | Flotation size |
| 225/47R17 | Warning | Aspect ratio not a multiple of 5 |
| 223/45R17 | Warning | Width does not end in 5 |
| 225/45R27 | Error | Rim outside 10–26 in passenger range |
| 225-45-17 | Fixed | Separators normalized to 225/45R17 |
| 225/45 | Error | Rim diameter missing |
What is Tire Size Input Validator?
A Tire Size Input Validator is a tool that checks whether a typed tire size follows standard notation and contains realistic values. Typing errors such as 225/54R17 instead of 225/45R17 produce a valid-looking but wrong result in every downstream calculation.
The validator separates hard errors, such as a missing rim, from warnings, such as an unusual aspect ratio. Some odd values exist on real tires, for example 255/42R20 or 325/30R21, so warnings do not block the entry.
The validator protects every other calculator on the site from bad input.
What are the uses of Tire Size Input Validator?
There are 4 main uses of the Tire Size Input Validator, including typo detection and data cleanup.
Typo detection
Catch swapped digits before a comparison runs.
Data cleanup
Normalize tire sizes in fleet spreadsheets and inventory lists.
Format conversion
Turn sizes written with dashes or spaces into standard notation.
Order checks
Confirm a size on a purchase order before it goes to a supplier.
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