Multiple Tire Size Comparator
Compare three or more tire sizes in one table. Rank candidates by diameter, sidewall, revolutions and difference from your stock size.
Compare several sizes together.
Multiple Tire Size Comparator: Tire Size Inputs
Compare two tire sizes here. Use the formulas and reference tables below for this tool's specific calculation.
How Multiple Tire Size Comparator Works?
The Multiple Tire Size Comparator works by calculating every candidate size against one reference size and sorting the results in a single table. The process has 4 steps.
Set the reference size
Enter the original equipment (OE) size from the door placard as row 1.
Add candidate sizes
Add up to 10 alternative sizes, one per row, using the width/aspect R rim format.
Calculate all rows
The comparator computes sidewall height, overall diameter, circumference and revolutions per mile for every row.
Sort and filter
Sort candidates by percent difference to see which sizes sit closest to the reference diameter.
Multiple Tire Size Comparator Formula
The Multiple Tire Size Comparator formula is Δ%ᵢ = (ODᵢ − OD_ref) ÷ OD_ref × 100, applied to each candidate size i.
ODᵢ = 2 × Wᵢ × ARᵢ ÷ 100 + Rimᵢ × 25.4Δ%ᵢ = (ODᵢ − OD_ref) ÷ OD_ref × 100RPMᵢ = 1,609,344 ÷ (π × ODᵢ)- i
- Row number of the candidate size
- OD_ref
- Overall diameter of the reference size in mm
- RPMᵢ
- Revolutions per mile of candidate i
Worked example
With 205/55 R16 as the reference (631.9 mm), the candidate 215/55 R16 measures 642.9 mm. The deviation is +1.74%. The candidate 225/55 R16 measures 653.9 mm, a deviation of +3.48%.
Multiple Tire Size Comparator Conversion Table
The Multiple Tire Size Comparator conversion table ranks 6 sizes that fit a 16-inch (406.4 mm) rim against a 205/55 R16 reference.
| Size | Sidewall | Overall diameter | Revs per mile / per km | Δ vs reference |
|---|---|---|---|---|
| 205/55 R16 | 112.8 mm | 631.9 mm (24.88 in) | 811 / 504 | +0.00% |
| 215/55 R16 | 118.2 mm | 642.9 mm (25.31 in) | 797 / 495 | +1.74% |
| 225/50 R16 | 112.5 mm | 631.4 mm (24.86 in) | 811 / 504 | -0.08% |
| 205/60 R16 | 123.0 mm | 652.4 mm (25.69 in) | 785 / 488 | +3.24% |
| 215/60 R16 | 129.0 mm | 664.4 mm (26.16 in) | 771 / 479 | +5.14% |
| 225/55 R16 | 123.8 mm | 653.9 mm (25.74 in) | 783 / 487 | +3.48% |
What is Multiple Tire Size Comparator?
A Multiple Tire Size Comparator is a calculator that compares three or more tire sizes in one view against a single reference size. A two-size calculator answers one question at a time. The Multiple Tire Size Comparator answers which of several sizes fits best in one pass.
Each row uses the same ISO metric sizing math. The reference row stays fixed, and every other row shows its millimeter and percent difference from the reference.
Tire shoppers use the Multiple Tire Size Comparator when a vehicle accepts several approved sizes or when a store lists five or six sizes on the same rim diameter.
What are the uses of Multiple Tire Size Comparator?
There are 5 main uses of the Multiple Tire Size Comparator, including shortlist building, availability checks and fleet planning.
Shortlist building
Narrow 10 candidate sizes down to the 2 or 3 sizes closest to stock diameter.
Availability checks
Compare every size a supplier stocks for one rim diameter.
Trim-level comparisons
Line up the different factory sizes fitted to base, mid and sport trims of one model.
Fleet planning
Pick one common size that suits several vehicles in a fleet.
Seasonal swaps
Compare summer, all-season and winter sizes for one car in one table.
Related Core Tire Dimensions Tools
View All 134 Subtools →Compare two tire sizes.
Estimate nominal overall diameter.
Calculate absolute and percentage differences.
Estimate nominal circumference.
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