Tire Diameter Ranking Tool
Sort sizes from short to tall. Use the calculator below. Results update as you type.
Overall Diameter = (Rim Diameter × 25.4) + 2 × (Width × Aspect Ratio / 100)How the Tire Diameter Ranking Tool Works
This tool works by computing the nominal diameter of each candidate size and sorting the list from shortest to tallest. It shows the gap to the next size in each row.
- Paste or type the sizes, one per line.
- Let the tool compute each diameter.
- Read the ranked list with rank numbers.
- Read the gap column to spot sizes that are almost equal.
The Formula
The formula computes D for each size with Overall Diameter = (Rim Diameter × 25.4) + 2 × (Width × Aspect Ratio ÷ 100), then sorts ascending.
D_i = (Rim_i × 25.4) + 2 × (W_i × AR_i ÷ 100) Rank = sort(D_i, ascending) Gap_i = D_(i+1) − D_iWorked example: 245/75R16 (30.47 in) and 265/60R18 (30.52 in) sit next to each other with a 0.05 in (1.3 mm) gap.
Conversion Table
The conversion table ranks 10 sizes from 205/55R16 (24.88 in) to 285/70R17 (32.71 in). The gap column shows the step to the next size.
Two pairs are almost the same height: 205/55R16 with 225/45R17 (0.09 in apart) and 245/75R16 with 265/60R18 (0.05 in apart).
| Rank | Size | Diameter (in) | Diameter (mm) | Gap to Next (in) |
|---|---|---|---|---|
| 1 | 205/55R16 | 24.88 | 632 | +0.09 |
| 2 | 225/45R17 | 24.97 | 634 | +1.35 |
| 3 | 235/45R18 | 26.33 | 669 | +0.39 |
| 4 | 245/40R19 | 26.72 | 679 | +1.80 |
| 5 | 225/65R17 | 28.52 | 724 | +0.53 |
| 6 | 255/55R18 | 29.04 | 738 | +1.43 |
| 7 | 245/75R16 | 30.47 | 774 | +0.05 |
| 8 | 265/60R18 | 30.52 | 775 | +1.39 |
| 9 | 275/55R20 | 31.91 | 810 | +0.80 |
| 10 | 285/70R17 | 32.71 | 831 | — |
What Is the Tire Diameter Ranking Tool?
The Tire Diameter Ranking Tool is a tool that sorts tire sizes by nominal overall height. It turns a mixed list of sizes into an ordered list.
Mixed lists come from tire shop stock, used-wheel listings and fleet records. Sorting by height reveals which sizes are interchangeable.
Common Uses
This tool has 4 uses: stock sorting, interchange checks, fleet audits and shopping.
- Sort stock: Order a shop's inventory by height.
- Check interchange: Spot sizes with almost equal height.
- Audit fleets: Find vehicles with odd sizes.
- Shop: Pick the size closest to a target.