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255/55R18 tires
255/55R18 reads off the tire sidewall: 255 mm of section width, a sidewall whose height is 55% of that width, and a 18 in mounting diameter.
- 4 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
- 140.3 mm
- Overall diameter
- 737.7 mm · 29.04 in
- Circumference
- 2,317.6 mm · 91.24 in
- Revolutions per mile
- 694 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 |
|---|---|---|---|
| 255/55R18Original size | 737.7 mm | 0 %Identical diameter | — |
| 255/50R19 | 737.6 mm | -0.01 %Within tolerance | In the catalogue |
| 255/60R17 | 737.8 mm | +0.01 %Within tolerance | — |
| 255/45R20 | 737.5 mm | -0.03 %Within tolerance | In the catalogue |
| 255/65R16 | 737.9 mm | +0.03 %Within tolerance | — |
| 235/65R17 | 737.3 mm | -0.05 %Within tolerance | In the catalogue |
| 275/60R16 | 736.4 mm | -0.18 %Within tolerance | — |
| 285/45R19 | 739.1 mm | +0.19 %Within tolerance | — |
| 235/60R18 | 739.2 mm | +0.2 %Within tolerance | In the catalogue |
| 285/40R20 | 736 mm | -0.23 %Within tolerance | — |
| 235/70R16 | 735.4 mm | -0.31 %Within tolerance | In the catalogue |
| 235/55R19 | 741.1 mm | +0.46 %Within tolerance | In the catalogue |
| 275/55R17 | 734.3 mm | -0.46 %Within tolerance | — |
| 285/50R18 | 742.2 mm | +0.61 %Within tolerance | — |
| 225/50R20 | 733 mm | -0.64 %Within tolerance | — |
| 235/50R20 | 743 mm | +0.72 %Within tolerance | In the catalogue |
| 225/75R16 | 743.9 mm | +0.84 %Within tolerance | In the catalogue |
| 225/55R19 | 730.1 mm | -1.03 %Within tolerance | In the catalogue |
| 265/45R20 | 746.5 mm | +1.19 %Within tolerance | In the catalogue |
| 245/45R20 | 728.5 mm | -1.25 %Within tolerance | In the catalogue |
| 275/40R20 | 728 mm | -1.31 %Within tolerance | In the catalogue |
| 265/50R19 | 747.6 mm | +1.34 %Within tolerance | In the catalogue |
| 225/60R18 | 727.2 mm | -1.42 %Within tolerance | In the catalogue |
| 245/70R16 | 749.4 mm | +1.59 %Within tolerance | In the catalogue |
| 245/65R17 | 750.3 mm | +1.71 %Within tolerance | In the catalogue |
| 225/65R17 | 724.3 mm | -1.82 %Within tolerance | In the catalogue |
| 245/60R18 | 751.2 mm | +1.83 %Within tolerance | In the catalogue |
| 245/55R19 | 752.1 mm | +1.95 %Within tolerance | In the catalogue |
| 245/50R20 | 753 mm | +2.07 %For reference only | In the catalogue |
| 225/70R16 | 721.4 mm | -2.21 %For reference only | In the catalogue |
| 275/45R20 | 755.5 mm | +2.41 %For reference only | In the catalogue |
| 235/45R20 | 719.5 mm | -2.47 %For reference only | In the catalogue |
| 235/50R19 | 717.6 mm | -2.72 %For reference only | In the catalogue |
| 235/55R18 | 715.7 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.