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225/55R18 tires
225/55R18 reads off the tire sidewall: 225 mm of section width, a sidewall whose height is 55% of that width, and a 18 in mounting diameter.
- 12 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
- 123.8 mm
- Overall diameter
- 704.7 mm · 27.74 in
- Circumference
- 2,213.9 mm · 87.16 in
- Revolutions per mile
- 727 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 |
|---|---|---|---|
| 225/55R18Original size | 704.7 mm | 0 %Identical diameter | — |
| 195/70R17 | 704.8 mm | +0.01 %Within tolerance | — |
| 245/40R20 | 704 mm | -0.1 %Within tolerance | In the catalogue |
| 205/60R18 | 703.2 mm | -0.21 %Within tolerance | — |
| 245/45R19 | 703.1 mm | -0.23 %Within tolerance | In the catalogue |
| 195/50R20 | 703 mm | -0.24 %Within tolerance | — |
| 245/50R18 | 702.2 mm | -0.35 %Within tolerance | In the catalogue |
| 215/70R16 | 707.4 mm | +0.38 %Within tolerance | In the catalogue |
| 225/50R19 | 707.6 mm | +0.41 %Within tolerance | — |
| 225/60R17 | 701.8 mm | -0.41 %Within tolerance | In the catalogue |
| 215/45R20 | 701.5 mm | -0.45 %Within tolerance | — |
| 205/55R19 | 708.1 mm | +0.48 %Within tolerance | In the catalogue |
| 245/55R17 | 701.3 mm | -0.48 %Within tolerance | — |
| 245/60R16 | 700.4 mm | -0.61 %Within tolerance | — |
| 195/75R16 | 698.9 mm | -0.82 %Within tolerance | In the catalogue |
| 225/45R20 | 710.5 mm | +0.82 %Within tolerance | — |
| 225/65R16 | 698.9 mm | -0.82 %Within tolerance | In the catalogue |
| 215/65R17 | 711.3 mm | +0.94 %Within tolerance | In the catalogue |
| 235/65R16 | 711.9 mm | +1.02 %Within tolerance | In the catalogue |
| 255/40R20 | 712 mm | +1.04 %Within tolerance | In the catalogue |
| 255/45R19 | 712.1 mm | +1.05 %Within tolerance | In the catalogue |
| 235/60R17 | 713.8 mm | +1.29 %Within tolerance | In the catalogue |
| 205/75R16 | 713.9 mm | +1.31 %Within tolerance | In the catalogue |
| 235/45R19 | 694.1 mm | -1.5 %Within tolerance | In the catalogue |
| 215/55R18 | 693.7 mm | -1.56 %Within tolerance | In the catalogue |
| 235/55R18 | 715.7 mm | +1.56 %Within tolerance | In the catalogue |
| 235/50R18 | 692.2 mm | -1.77 %Within tolerance | In the catalogue |
| 235/50R19 | 717.6 mm | +1.83 %Within tolerance | In the catalogue |
| 235/55R17 | 690.3 mm | -2.04 %For reference only | In the catalogue |
| 235/45R20 | 719.5 mm | +2.1 %For reference only | In the catalogue |
| 215/60R17 | 689.8 mm | -2.11 %For reference only | In the catalogue |
| 235/60R16 | 688.4 mm | -2.31 %For reference only | In the catalogue |
| 225/70R16 | 721.4 mm | +2.37 %For reference only | In the catalogue |
| 255/40R19 | 686.6 mm | -2.57 %For reference only | In the catalogue |
| 255/35R20 | 686.5 mm | -2.58 %For reference only | In the catalogue |
| 215/65R16 | 685.9 mm | -2.67 %For reference only | In the catalogue |
| 225/45R19 | 685.1 mm | -2.78 %For reference only | In the catalogue |
| 225/65R17 | 724.3 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.