255/40R18 tire size
A 255/40R18 tire is 26.03 in (661.2 mm) tall and 10.04 in (255.0 mm) wide, and turns 775 revolutions per mile.
- 26.03 inOverall diameter
- 4.02 inSidewall height
- 775Revolutions per mile
- 26.0x10.0R18Flotation equivalent
| Measurement | Inches | Millimeters |
|---|---|---|
| Overall diameter | 26.03 in | 661.2 mm |
| Section width | 10.04 in | 255.0 mm |
| Sidewall height | 4.02 in | 102.0 mm |
| Rim diameter | 18.00 in | 457.2 mm |
| Circumference | 81.78 in | 2,077 mm |
| Revolutions per mile | 775 | |
| Flotation equivalent | 26.0x10.0R18 (approx.) | |
255/40R18 is a 18-inch tire with a 255 mm (10.04 in) section width and a 40% aspect ratio, giving a 4.02-inch sidewall and a flotation-style size of about 26.0x10.0R18.
Its overall diameter is 26.03 inches, so it rolls 81.8 inches per revolution and turns about 775 times per mile.
65 other sizes in this list are within 3% of that diameter.
Compare 255/40R18 with plausible swaps
- 215/60R16 vs 255/40R18 (+0.48%)
- 225/50R17 vs 255/40R18 (−0.67%)
- 205/55R17 vs 255/40R18 (−0.59%)
- 255/45R17 vs 255/40R18 (+0.02%)
- 235/50R17 vs 255/40R18 (+0.85%)
- 255/35R18 vs 255/40R18 (−3.86%)
- 235/40R18 vs 255/40R18 (−2.42%)
- 245/40R18 vs 255/40R18 (−1.21%)
- 285/35R18 vs 255/40R18 (−0.68%)
- 225/45R18 vs 255/40R18 (−0.23%)
- 255/40R18 vs 295/35R18 (+0.38%)
- 255/40R18 vs 265/40R18 (+1.21%)
- 255/40R18 vs 275/40R18 (+2.42%)
- 255/40R18 vs 255/45R18 (+3.86%)
- 255/40R18 vs 295/30R19 (−0.24%)
- 255/40R18 vs 255/35R19 (−0.02%)
- 255/40R18 vs 225/40R19 (+0.21%)
- 255/40R18 vs 305/30R19 (+0.67%)
- 255/40R18 vs 255/30R20 (−0.03%)
- 255/40R18 vs 225/35R20 (+0.65%)
- 255/40R18 vs 265/30R20 (+0.88%)
Sizes within 3% of 26.03 in diameter
- 255/45R17 26.04 in (+0.02%)
- 255/35R19 26.03 in (−0.02%)
- 255/30R20 26.02 in (−0.03%)
- 215/65R15 26.00 in (−0.11%)
- 225/40R19 26.09 in (+0.21%)
- 225/45R18 25.97 in (−0.23%)
- 295/30R19 25.97 in (−0.24%)
- 235/60R15 26.10 in (+0.27%)
- 205/75R14 26.11 in (+0.29%)
- 295/35R18 26.13 in (+0.38%)
- 215/60R16 26.16 in (+0.48%)
- 205/55R17 25.88 in (−0.59%)
- 225/35R20 26.20 in (+0.65%)
- 305/30R19 26.20 in (+0.67%)
- 225/50R17 25.86 in (−0.67%)
- 285/35R18 25.85 in (−0.68%)
- 215/70R14 25.85 in (−0.70%)
- 235/50R17 26.25 in (+0.85%)
- 265/30R20 26.26 in (+0.88%)
- 205/70R15 26.30 in (+1.03%)
- 265/35R19 26.30 in (+1.04%)
- 215/55R17 26.31 in (+1.07%)
- 245/35R19 25.75 in (−1.07%)
- 195/70R15 25.75 in (−1.09%)
- 225/55R16 25.74 in (−1.10%)
- 235/45R18 26.33 in (+1.13%)
- 285/30R19 25.73 in (−1.15%)
- 245/40R18 25.72 in (−1.21%)
- 265/40R18 26.35 in (+1.21%)
- 205/60R16 25.69 in (−1.33%)
- 245/45R17 25.68 in (−1.35%)
- 225/70R14 26.40 in (+1.42%)
- 235/40R19 26.40 in (+1.42%)
- 275/40R17 25.66 in (−1.42%)
- 225/60R15 25.63 in (−1.54%)
- 215/45R18 25.62 in (−1.59%)
- 215/50R18 26.46 in (+1.66%)
- 235/35R20 26.48 in (+1.71%)
- 275/35R18 25.58 in (−1.74%)
- 205/65R16 26.49 in (+1.77%)
- 275/30R20 26.50 in (+1.78%)
- 225/65R15 26.52 in (+1.86%)
- 195/75R14 25.52 in (−1.98%)
- 275/30R19 25.50 in (−2.06%)
- 205/65R15 25.49 in (−2.07%)
- 275/35R19 26.58 in (+2.10%)
- 235/35R19 25.48 in (−2.13%)
- 215/50R17 25.46 in (−2.18%)
- 225/60R16 26.63 in (+2.30%)
- 245/50R17 26.65 in (+2.36%)
- 235/40R18 25.40 in (−2.42%)
- 275/40R18 26.66 in (+2.42%)
- 245/45R18 26.68 in (+2.50%)
- 215/75R14 26.70 in (+2.56%)
- 245/40R19 26.72 in (+2.63%)
- 265/40R17 25.35 in (−2.63%)
- 285/30R20 26.73 in (+2.69%)
- 235/45R17 25.33 in (−2.71%)
- 225/55R17 26.74 in (+2.74%)
- 225/30R20 25.31 in (−2.75%)
- 245/35R20 26.75 in (+2.77%)
- 215/55R16 25.31 in (−2.77%)
- 265/35R18 25.30 in (−2.80%)
- 205/70R14 25.30 in (−2.81%)
- 265/30R19 25.26 in (−2.96%)
Open 255/40R18 in the tire size calculator
Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.