26x12.00R18 tire size
26x12.00R18 is a flotation (inch) size: 26.0" tall, 12.0" wide, on a 18" rim — about a 310/35R18. The sidewall is 4.0" and the tire turns 776 times per mile.
26x12.00R18 specs
| Overall diameter (height) | 26.00" · 660 mm |
|---|---|
| Section width | 12.00" · 305 mm |
| Sidewall height | 4.00" · 102 mm (33% of width) |
| Rim diameter | 18" |
| Circumference | 81.68" · 2.075 m |
| Revolutions per mile | 776 (482 per km) |
| Closest metric size | 310/35R18 |
Equivalent sizes on a 18" rim
Sizes within ±5% of the overall diameter. Green rows are inside the usual ±3% limit for keeping the speedometer, ABS and gearing right; red rows are bigger changes that need clearance checks.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 225/45R18 common | 25.97" | -0.11% | -80 mm | 59.9 mph | calculate → |
| 245/40R18 common | 25.72" | -1.09% | -60 mm | 59.3 mph | calculate → |
| 225/40R18 common | 25.09" | -3.51% | -80 mm | 57.9 mph | calculate → |
| 245/45R18 common | 26.68" | +2.62% | -60 mm | 61.6 mph | calculate → |
| 235/50R18 common | 27.25" | +4.82% | -70 mm | 62.9 mph | calculate → |
| 235/45R18 common | 26.33" | +1.26% | -70 mm | 60.8 mph | calculate → |
| 235/40R18 common | 25.40" | -2.30% | -70 mm | 58.6 mph | calculate → |
| 225/50R18 common | 26.86" | +3.30% | -80 mm | 62.0 mph | calculate → |
| 255/35R18 common | 25.03" | -3.74% | -50 mm | 57.8 mph | calculate → |
| 255/40R18 common | 26.03" | +0.12% | -50 mm | 60.1 mph | calculate → |
| 275/35R18 common | 25.58" | -1.62% | -30 mm | 59.0 mph | calculate → |
| 265/35R18 common | 25.30" | -2.68% | -40 mm | 58.4 mph | calculate → |
| 255/45R18 common | 27.04" | +3.98% | -50 mm | 62.4 mph | calculate → |
| 275/40R18 common | 26.66" | +2.54% | -30 mm | 61.5 mph | calculate → |
| 215/45R18 common | 25.62" | -1.47% | -90 mm | 59.1 mph | calculate → |
| 245/35R18 common | 24.75" | -4.80% | -60 mm | 57.1 mph | calculate → |
| 215/40R18 | 24.77" | -4.72% | -90 mm | 57.2 mph | calculate → |
| 285/35R18 | 25.85" | -0.56% | -20 mm | 59.7 mph | calculate → |
| 265/40R18 | 26.35" | +1.33% | -40 mm | 60.8 mph | calculate → |
| 295/30R18 | 24.97" | -3.97% | -10 mm | 57.6 mph | calculate → |
| 315/30R18 | 25.44" | -2.15% | +10 mm | 58.7 mph | calculate → |
| 285/30R18 | 24.73" | -4.88% | -20 mm | 57.1 mph | calculate → |
| 295/35R18 | 26.13" | +0.50% | -10 mm | 60.3 mph | calculate → |
| 335/30R18 | 25.91" | -0.33% | +30 mm | 59.8 mph | calculate → |
| 215/50R18 | 26.46" | +1.79% | -90 mm | 61.1 mph | calculate → |
| 295/40R18 | 27.29" | +4.97% | -10 mm | 63.0 mph | calculate → |
| 285/40R18 | 26.98" | +3.76% | -20 mm | 62.3 mph | calculate → |
| 305/35R18 | 26.41" | +1.56% | 0 mm | 60.9 mph | calculate → |
| 26x6.00R18 | 26.00" | 0.00% | -153 mm | 60.0 mph | calculate → |
| 26x8.00R18 | 26.00" | 0.00% | -102 mm | 60.0 mph | calculate → |
| 145/70R18 | 25.99" | -0.03% | -160 mm | 60.0 mph | calculate → |
| 155/70R18 | 26.54" | +2.09% | -150 mm | 61.3 mph | calculate → |
| 155/60R18 | 25.32" | -2.60% | -150 mm | 58.4 mph | calculate → |
| 305/30R18 | 25.20" | -3.06% | 0 mm | 58.2 mph | calculate → |
| 325/35R18 | 26.96" | +3.68% | +20 mm | 62.2 mph | calculate → |
| 165/70R18 | 27.09" | +4.21% | -140 mm | 62.5 mph | calculate → |
| 145/80R18 | 27.13" | +4.36% | -160 mm | 62.6 mph | calculate → |
| 345/30R18 | 26.15" | +0.58% | +40 mm | 60.3 mph | calculate → |
| 315/35R18 | 26.68" | +2.62% | +10 mm | 61.6 mph | calculate → |
| 205/45R18 | 25.26" | -2.83% | -100 mm | 58.3 mph | calculate → |
| 195/60R18 | 27.21" | +4.66% | -110 mm | 62.8 mph | calculate → |
Plus / minus sizing: 17" and 19" rims
Same overall height on a different rim. Check wheel width and clearance before switching.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 225/50R17 common | 25.86" | -0.55% | -80 mm | 59.7 mph | calculate → |
| 255/35R19 common | 26.03" | +0.11% | -50 mm | 60.1 mph | calculate → |
| 245/35R19 common | 25.75" | -0.95% | -60 mm | 59.4 mph | calculate → |
| 225/40R19 common | 26.09" | +0.33% | -80 mm | 60.2 mph | calculate → |
| 235/50R17 common | 26.25" | +0.97% | -70 mm | 60.6 mph | calculate → |
| 205/55R17 | 25.88" | -0.47% | -100 mm | 59.7 mph | calculate → |
| 305/30R19 | 26.20" | +0.79% | 0 mm | 60.5 mph | calculate → |
| 295/30R19 | 25.97" | -0.12% | -10 mm | 59.9 mph | calculate → |
| 255/45R17 | 26.04" | +0.14% | -50 mm | 60.1 mph | calculate → |
| 335/35R17 | 26.23" | +0.89% | +30 mm | 60.5 mph | calculate → |
| 285/40R17 | 25.98" | -0.09% | -20 mm | 59.9 mph | calculate → |
| 195/60R17 | 26.21" | +0.82% | -110 mm | 60.5 mph | calculate → |
| 175/65R17 | 25.96" | -0.17% | -130 mm | 59.9 mph | calculate → |
| 145/80R17 | 26.13" | +0.51% | -160 mm | 60.3 mph | calculate → |
| 26x6.00R17 | 26.00" | 0.00% | -153 mm | 60.0 mph | calculate → |
| 185/60R17 | 25.74" | -1.00% | -120 mm | 59.4 mph | calculate → |
| 165/70R17 | 26.09" | +0.36% | -140 mm | 60.2 mph | calculate → |
Try another size against 26x12.00R18
Questions
What size is 26x12.00R18 in inches?
26x12.00R18 is about 26.0" tall and 12.0" wide on a 18-inch rim — roughly a 310/35R18 in inch sizing.
What does 26x12.00R18 mean?
26" overall diameter, 12.00" section width, radial, 18" rim.
What tire sizes are equivalent to 26x12.00R18?
On the same 18" rim, within 3% of the diameter: 26x6.00R18 (0.00%), 26x8.00R18 (0.00%), 145/70R18 (-0.03%), 225/45R18 (-0.11%), 255/40R18 (+0.12%), 335/30R18 (-0.33%).
How many revolutions per mile does a 26x12.00R18 tire make?
About 776 revolutions per mile (circumference 81.7").
How these numbers are computed
Diameter = rim + 2 × sidewall, sidewall = width × aspect ÷ 100, circumference = π × diameter, revolutions per mile = 63,360 ÷ circumference. Real tires differ by brand by a few tenths of an inch. Last reviewed October 14, 2026.