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255/40R20 tires
255/40R20 reads off the tire sidewall: 255 mm of section width, a sidewall whose height is 40% of that width, and a 20 in mounting diameter.
- 5 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
- 102 mm
- Overall diameter
- 712 mm · 28.03 in
- Circumference
- 2,236.8 mm · 88.06 in
- Revolutions per mile
- 719 rev.
- Section width
- 10.04 in
- Usable mounting width
- 7 to 9 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 |
|---|---|---|---|
| 255/40R20Original size | 712 mm | 0 %Identical diameter | — |
| 255/35R21 | 711.9 mm | -0.01 %Within tolerance | — |
| 255/45R19 | 712.1 mm | +0.01 %Within tolerance | In the catalogue |
| 255/30R22 | 711.8 mm | -0.03 %Within tolerance | — |
| 255/50R18 | 712.2 mm | +0.03 %Within tolerance | — |
| 225/40R21 | 713.4 mm | +0.2 %Within tolerance | — |
| 285/40R19 | 710.6 mm | -0.2 %Within tolerance | — |
| 225/45R20 | 710.5 mm | -0.21 %Within tolerance | — |
| 285/45R18 | 713.7 mm | +0.24 %Within tolerance | — |
| 235/55R18 | 715.7 mm | +0.52 %Within tolerance | In the catalogue |
| 225/35R22 | 716.3 mm | +0.6 %Within tolerance | — |
| 225/50R19 | 707.6 mm | -0.62 %Within tolerance | — |
| 285/35R20 | 707.5 mm | -0.63 %Within tolerance | — |
| 235/50R19 | 717.6 mm | +0.79 %Within tolerance | In the catalogue |
| 265/30R22 | 717.8 mm | +0.81 %Within tolerance | — |
| 245/30R22 | 705.8 mm | -0.87 %Within tolerance | — |
| 225/55R18 | 704.7 mm | -1.03 %Within tolerance | In the catalogue |
| 235/45R20 | 719.5 mm | +1.05 %Within tolerance | In the catalogue |
| 245/40R20 | 704 mm | -1.12 %Within tolerance | In the catalogue |
| 245/45R19 | 703.1 mm | -1.25 %Within tolerance | In the catalogue |
| 275/40R19 | 702.6 mm | -1.32 %Within tolerance | In the catalogue |
| 245/50R18 | 702.2 mm | -1.38 %Within tolerance | In the catalogue |
| 275/35R20 | 700.5 mm | -1.62 %Within tolerance | In the catalogue |
| 225/60R18 | 727.2 mm | +2.13 %For reference only | In the catalogue |
| 275/40R20 | 728 mm | +2.25 %For reference only | In the catalogue |
| 245/45R20 | 728.5 mm | +2.32 %For reference only | In the catalogue |
| 235/45R19 | 694.1 mm | -2.51 %For reference only | In the catalogue |
| 225/55R19 | 730.1 mm | +2.54 %For reference only | In the catalogue |
| 235/50R18 | 692.2 mm | -2.78 %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.