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225/40R18 tires
225/40R18 reads off the tire sidewall: 225 mm of section width, a sidewall whose height is 40% of that width, and a 18 in mounting diameter.
- 11 models
Models
The models we carry in this size, sorted by brand.
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This size, measured
These figures are derived from the three numbers, not entered by hand: it is the same arithmetic as the size equivalence calculator.
- Sidewall height
- 90 mm
- Overall diameter
- 637.2 mm · 25.09 in
- Circumference
- 2,001.8 mm · 78.81 in
- Revolutions per mile
- 804 rev.
- Section width
- 8.86 in
- Usable mounting width
- 6 to 8 in
Usable mounting width is a trade rule of thumb, roughly 70 to 90% of section width. It is not a standard. The exact range is whatever the manufacturer publishes for that model.
Equivalent sizes
Sizes whose overall diameter stays within 3% of this one. The ones we carry link to their own page. These are computed suggestions, not a guarantee of fit: the vehicle manual decides.
| Size | Overall diameter | Gap | In the catalogue |
|---|---|---|---|
| 225/40R18Original size | 637.2 mm | 0 %Identical diameter | — |
| 215/30R20 | 637 mm | -0.03 %Within tolerance | — |
| 205/50R17 | 636.8 mm | -0.06 %Within tolerance | In the catalogue |
| 255/45R16 | 635.9 mm | -0.2 %Within tolerance | — |
| 195/40R19 | 638.6 mm | +0.22 %Within tolerance | — |
| 255/40R17 | 635.8 mm | -0.22 %Within tolerance | — |
| 255/35R18 | 635.7 mm | -0.24 %Within tolerance | — |
| 255/30R19 | 635.6 mm | -0.25 %Within tolerance | — |
| 255/25R20 | 635.5 mm | -0.27 %Within tolerance | — |
| 225/35R19 | 640.1 mm | +0.46 %Within tolerance | — |
| 225/45R17 | 634.3 mm | -0.46 %Within tolerance | In the catalogue |
| 195/60R16 | 640.4 mm | +0.5 %Within tolerance | In the catalogue |
| 215/35R19 | 633.1 mm | -0.64 %Within tolerance | — |
| 235/50R16 | 641.4 mm | +0.66 %Within tolerance | — |
| 195/45R18 | 632.7 mm | -0.71 %Within tolerance | — |
| 205/45R18 | 641.7 mm | +0.71 %Within tolerance | — |
| 205/55R16 | 631.9 mm | -0.83 %Within tolerance | In the catalogue |
| 215/55R16 | 642.9 mm | +0.89 %Within tolerance | In the catalogue |
| 235/45R17 | 643.3 mm | +0.96 %Within tolerance | In the catalogue |
| 235/40R18 | 645.2 mm | +1.26 %Within tolerance | In the catalogue |
| 215/50R17 | 646.8 mm | +1.51 %Within tolerance | In the catalogue |
| 235/35R19 | 647.1 mm | +1.55 %Within tolerance | In the catalogue |
| 215/45R17 | 625.3 mm | -1.87 %Within tolerance | In the catalogue |
| 245/45R17 | 652.3 mm | +2.37 %For reference only | In the catalogue |
| 205/60R16 | 652.4 mm | +2.39 %For reference only | In the catalogue |
| 245/40R18 | 653.2 mm | +2.51 %For reference only | In the catalogue |
| 195/55R16 | 620.9 mm | -2.56 %For reference only | In the catalogue |
| 225/55R16 | 653.9 mm | +2.62 %For reference only | In the catalogue |
Other ways to browse
Every size, every brand and every season has its own page: the models offered, the technical sheet and the equivalents.