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235/40R18 tires
235/40R18 reads off the tire sidewall: 235 mm of section width, a sidewall whose height is 40% of that width, and a 18 in mounting diameter.
- 2 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
- 94 mm
- Overall diameter
- 645.2 mm · 25.4 in
- Circumference
- 2,027 mm · 79.8 in
- Revolutions per mile
- 794 rev.
- Section width
- 9.25 in
- Usable mounting width
- 6.5 to 8.5 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 |
|---|---|---|---|
| 235/40R18Original size | 645.2 mm | 0 %Identical diameter | — |
| 265/45R16 | 644.9 mm | -0.05 %Within tolerance | — |
| 205/40R19 | 646.6 mm | +0.22 %Within tolerance | — |
| 265/40R17 | 643.8 mm | -0.22 %Within tolerance | — |
| 215/50R17 | 646.8 mm | +0.25 %Within tolerance | In the catalogue |
| 235/35R19 | 647.1 mm | +0.29 %Within tolerance | In the catalogue |
| 235/45R17 | 643.3 mm | -0.29 %Within tolerance | In the catalogue |
| 225/30R20 | 643 mm | -0.34 %Within tolerance | — |
| 215/55R16 | 642.9 mm | -0.36 %Within tolerance | In the catalogue |
| 265/35R18 | 642.7 mm | -0.39 %Within tolerance | In the catalogue |
| 205/45R18 | 641.7 mm | -0.54 %Within tolerance | — |
| 265/30R19 | 641.6 mm | -0.56 %Within tolerance | — |
| 235/30R20 | 649 mm | +0.59 %Within tolerance | — |
| 235/50R16 | 641.4 mm | -0.59 %Within tolerance | — |
| 265/25R20 | 640.5 mm | -0.73 %Within tolerance | — |
| 225/35R19 | 640.1 mm | -0.79 %Within tolerance | — |
| 245/45R17 | 652.3 mm | +1.1 %Within tolerance | In the catalogue |
| 205/60R16 | 652.4 mm | +1.12 %Within tolerance | In the catalogue |
| 225/40R18 | 637.2 mm | -1.24 %Within tolerance | In the catalogue |
| 245/40R18 | 653.2 mm | +1.24 %Within tolerance | In the catalogue |
| 205/50R17 | 636.8 mm | -1.3 %Within tolerance | In the catalogue |
| 225/55R16 | 653.9 mm | +1.35 %Within tolerance | In the catalogue |
| 225/45R17 | 634.3 mm | -1.69 %Within tolerance | In the catalogue |
| 225/50R17 | 656.8 mm | +1.8 %Within tolerance | In the catalogue |
| 205/55R17 | 657.3 mm | +1.88 %Within tolerance | In the catalogue |
| 205/55R16 | 631.9 mm | -2.06 %For reference only | In the catalogue |
| 225/45R18 | 659.7 mm | +2.25 %For reference only | In the catalogue |
| 255/35R19 | 661.1 mm | +2.46 %For reference only | In the catalogue |
| 225/40R19 | 662.6 mm | +2.7 %For reference only | In the catalogue |
| 215/60R16 | 664.4 mm | +2.98 %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.