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275/45R21 tires
275/45R21 reads off the tire sidewall: 275 mm of section width, a sidewall whose height is 45% of that width, and a 21 in mounting diameter.
- 3 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
- 780.9 mm · 30.74 in
- Circumference
- 2,453.3 mm · 96.59 in
- Revolutions per mile
- 656 rev.
- Section width
- 10.83 in
- Usable mounting width
- 7.5 to 9.5 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 |
|---|---|---|---|
| 275/45R21Original size | 780.9 mm | 0 %Identical diameter | — |
| 245/40R23 | 780.2 mm | -0.09 %Within tolerance | — |
| 245/45R22 | 779.3 mm | -0.2 %Within tolerance | — |
| 305/45R20 | 782.5 mm | +0.2 %Within tolerance | — |
| 275/40R22 | 778.8 mm | -0.27 %Within tolerance | In the catalogue |
| 275/50R20 | 783 mm | +0.27 %Within tolerance | In the catalogue |
| 245/50R21 | 778.4 mm | -0.32 %Within tolerance | — |
| 285/35R23 | 783.7 mm | +0.36 %Within tolerance | — |
| 295/50R19 | 777.6 mm | -0.42 %Within tolerance | — |
| 245/55R20 | 777.5 mm | -0.44 %Within tolerance | — |
| 305/40R21 | 777.4 mm | -0.45 %Within tolerance | — |
| 275/35R23 | 776.7 mm | -0.54 %Within tolerance | — |
| 275/55R19 | 785.1 mm | +0.54 %Within tolerance | — |
| 245/60R19 | 776.6 mm | -0.55 %Within tolerance | — |
| 285/40R22 | 786.8 mm | +0.76 %Within tolerance | — |
| 305/50R19 | 787.6 mm | +0.86 %Within tolerance | — |
| 265/55R19 | 774.1 mm | -0.87 %Within tolerance | In the catalogue |
| 255/55R20 | 788.5 mm | +0.97 %Within tolerance | In the catalogue |
| 255/60R19 | 788.6 mm | +0.99 %Within tolerance | In the catalogue |
| 265/50R20 | 773 mm | -1.01 %Within tolerance | In the catalogue |
| 265/45R21 | 771.9 mm | -1.15 %Within tolerance | In the catalogue |
| 265/40R22 | 770.8 mm | -1.29 %Within tolerance | In the catalogue |
| 295/40R21 | 769.4 mm | -1.47 %Within tolerance | In the catalogue |
| 255/55R19 | 763.1 mm | -2.28 %For reference only | In the catalogue |
| 255/50R20 | 763 mm | -2.29 %For reference only | In the catalogue |
| 285/40R21 | 761.4 mm | -2.5 %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.