Approved Rim Width Checker
Check whether a wheel width falls inside a tire's approved rim width range. Compare against published minimum, maximum and measuring rim.
Compare wheels with published tire limits.
Approved Rim Width Checker: Tire Size Inputs
Compare two tire sizes here. Use the formulas and reference tables below for this tool's specific calculation.
How Approved Rim Width Checker Works?
The Approved Rim Width Checker works by comparing the wheel's nominal width with the minimum and maximum rim widths the tire maker publishes for that tire size. The check takes 3 steps.
Enter the tire size
Type the size, for example 225/45 R17.
Enter the published range
Copy the approved range from the tire data book, for example 7.0 in to 8.5 in.
Enter the wheel width
Type the wheel width, for example 9.0 in. The checker returns Outside range: 0.5 in (12.7 mm) wider than the maximum.
Approved Rim Width Checker Formula
The Approved Rim Width Checker passes a wheel when Rim_min ≤ Rim_wheel ≤ Rim_max.
Rim_min ≤ W_wheel ≤ Rim_maxM_min = W_wheel − Rim_minM_max = Rim_max − W_wheel- Rim_min, Rim_max
- Published approved rim widths (in)
- W_wheel
- Nominal wheel width (in)
Worked example
A 245/40 R18 tire with an approved range of 8.0 in to 9.5 in passes on a 9.0 in wheel with 0.5 in (12.7 mm) of margin. The same tire on a 10.0 in wheel fails by 0.5 in.
Approved Rim Width Checker Conversion Table
The Approved Rim Width Checker conversion table lists typical approved rim width ranges for 8 sizes in inches and millimeters.
| Tire size | Approved range (in) | Approved range (mm) | Measuring rim |
|---|---|---|---|
| 205/55 R16 | 6.0"–7.5" | 152–190 mm | 6.5" |
| 215/60 R16 | 6.0"–7.5" | 152–190 mm | 6.5" |
| 225/45 R17 | 7.0"–8.5" | 178–216 mm | 7.5" |
| 235/45 R18 | 7.5"–9.0" | 190–229 mm | 8.0" |
| 245/40 R18 | 8.0"–9.5" | 203–241 mm | 8.5" |
| 255/35 R19 | 8.5"–10.0" | 216–254 mm | 9.0" |
| 265/70 R17 | 7.0"–9.0" | 178–229 mm | 8.0" |
| 275/55 R20 | 7.5"–9.5" | 190–241 mm | 8.0" |
Ranges are typical ETRTO and TRA values. The governing range is the one published for the exact tire model.
What is Approved Rim Width Checker?
An Approved Rim Width Checker is a tool that confirms a wheel's width sits inside the range the tire maker approves for a tire size. Tire makers publish the range in data books, and the European Tyre and Rim Technical Organisation (ETRTO) and TRA publish standard ranges.
A wheel narrower than the minimum pinches the tire and makes the sidewall bulge. A wheel wider than the maximum stretches the tire and weakens bead retention.
Tire shops in many regions refuse to mount tires outside the approved range.
What are the uses of Approved Rim Width Checker?
There are 4 main uses of the Approved Rim Width Checker, including wheel upgrades and stretched tire avoidance.
Wheel upgrades
Confirm a wider wheel still suits the chosen tire.
Stretched tire avoidance
Catch setups outside the maximum width.
Shop acceptance
Check that a shop will mount the combination.
Tire choice
Pick a tire size that suits an existing wheel width.
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