$128.70
$514.80 for 4 · On order, delivered in 2 business days
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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.
- 1 model
- from $128.70 per tire
- 1 on order
Models
Every price shown is the price of this exact size, and the dot says what is ready today.
Prices are per tire, before sales tax. You send your request online; the final amount, payment and handover are then arranged directly with us.
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 shop 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 |
| 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.