29x18.00R20 tire size
29x18.00R20 is a flotation (inch) size: 29.0" tall, 18.0" wide, on a 20" rim — about a 460/25R20. The sidewall is 4.5" and the tire turns 695 times per mile.
29x18.00R20 specs
| Overall diameter (height) | 29.00" · 737 mm |
|---|---|
| Section width | 18.00" · 457 mm |
| Sidewall height | 4.50" · 114 mm (25% of width) |
| Rim diameter | 20" |
| Circumference | 91.11" · 2.314 m |
| Revolutions per mile | 695 (432 per km) |
| Closest metric size | 460/25R20 |
Equivalent sizes on a 20" 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 | |
|---|---|---|---|---|---|
| 245/45R20 common | 28.68" | -1.10% | -212 mm | 59.3 mph | calculate → |
| 255/45R20 common | 29.04" | +0.12% | -202 mm | 60.1 mph | calculate → |
| 275/40R20 common | 28.66" | -1.17% | -182 mm | 59.3 mph | calculate → |
| 255/50R20 common | 30.04" | +3.58% | -202 mm | 62.2 mph | calculate → |
| 245/40R20 common | 27.72" | -4.43% | -212 mm | 57.3 mph | calculate → |
| 265/50R20 common | 30.43" | +4.94% | -192 mm | 63.0 mph | calculate → |
| 245/50R20 common | 29.65" | +2.23% | -212 mm | 61.3 mph | calculate → |
| 275/45R20 common | 29.74" | +2.57% | -182 mm | 61.5 mph | calculate → |
| 235/55R20 common | 30.18" | +4.06% | -222 mm | 62.4 mph | calculate → |
| 255/40R20 common | 28.03" | -3.34% | -202 mm | 58.0 mph | calculate → |
| 275/35R20 common | 27.58" | -4.90% | -182 mm | 57.1 mph | calculate → |
| 265/45R20 common | 29.39" | +1.34% | -192 mm | 60.8 mph | calculate → |
| 285/35R20 common | 27.85" | -3.95% | -172 mm | 57.6 mph | calculate → |
| 315/35R20 common | 28.68" | -1.10% | -142 mm | 59.3 mph | calculate → |
| 295/40R20 | 29.29" | +1.00% | -162 mm | 60.6 mph | calculate → |
| 295/35R20 | 28.13" | -3.00% | -162 mm | 58.2 mph | calculate → |
| 305/35R20 | 28.41" | -2.05% | -152 mm | 58.8 mph | calculate → |
| 285/40R20 | 28.98" | -0.08% | -172 mm | 60.0 mph | calculate → |
| 235/50R20 | 29.25" | +0.87% | -222 mm | 60.5 mph | calculate → |
| 235/45R20 | 28.33" | -2.32% | -222 mm | 58.6 mph | calculate → |
| 285/45R20 | 30.10" | +3.79% | -172 mm | 62.3 mph | calculate → |
| 265/40R20 | 28.35" | -2.25% | -192 mm | 58.6 mph | calculate → |
| 305/40R20 | 29.61" | +2.09% | -152 mm | 61.3 mph | calculate → |
| 335/30R20 | 27.91" | -3.75% | -122 mm | 57.8 mph | calculate → |
| 325/30R20 | 27.68" | -4.56% | -132 mm | 57.3 mph | calculate → |
| 345/30R20 | 28.15" | -2.93% | -112 mm | 58.2 mph | calculate → |
| 215/45R20 | 27.62" | -4.77% | -242 mm | 57.1 mph | calculate → |
| 325/35R20 | 28.96" | -0.15% | -132 mm | 59.9 mph | calculate → |
| 195/50R20 | 27.68" | -4.56% | -262 mm | 57.3 mph | calculate → |
| 29x15.00R20 | 29.00" | 0.00% | -76 mm | 60.0 mph | calculate → |
| 175/55R20 | 27.58" | -4.90% | -282 mm | 57.1 mph | calculate → |
| 195/55R20 | 28.44" | -1.91% | -262 mm | 58.9 mph | calculate → |
| 175/70R20 | 29.65" | +2.23% | -282 mm | 61.3 mph | calculate → |
| 225/45R20 | 27.97" | -3.54% | -232 mm | 57.9 mph | calculate → |
| 155/65R20 | 27.93" | -3.68% | -302 mm | 57.8 mph | calculate → |
| 165/60R20 | 27.80" | -4.15% | -292 mm | 57.5 mph | calculate → |
Plus / minus sizing: 19" and 21" rims
Same overall height on a different rim. Check wheel width and clearance before switching.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 235/55R19 common | 29.18" | +0.61% | -222 mm | 60.4 mph | calculate → |
| 255/50R19 common | 29.04" | +0.14% | -202 mm | 60.1 mph | calculate → |
| 225/55R19 common | 28.74" | -0.88% | -232 mm | 59.5 mph | calculate → |
| 295/35R21 | 29.13" | +0.45% | -162 mm | 60.3 mph | calculate → |
| 255/40R21 | 29.03" | +0.11% | -202 mm | 60.1 mph | calculate → |
| 285/35R21 | 28.85" | -0.50% | -172 mm | 59.7 mph | calculate → |
| 275/45R19 | 28.74" | -0.88% | -182 mm | 59.5 mph | calculate → |
| 245/40R21 | 28.72" | -0.98% | -212 mm | 59.4 mph | calculate → |
| 285/45R19 | 29.10" | +0.34% | -172 mm | 60.2 mph | calculate → |
| 335/30R21 | 28.91" | -0.30% | -122 mm | 59.8 mph | calculate → |
| 345/30R21 | 29.15" | +0.52% | -112 mm | 60.3 mph | calculate → |
| 225/45R21 | 28.97" | -0.10% | -232 mm | 59.9 mph | calculate → |
| 315/40R19 | 28.92" | -0.27% | -142 mm | 59.8 mph | calculate → |
| 155/80R19 | 28.76" | -0.81% | -302 mm | 59.5 mph | calculate → |
Try another size against 29x18.00R20
Questions
What size is 29x18.00R20 in inches?
29x18.00R20 is about 29.0" tall and 18.0" wide on a 20-inch rim — roughly a 460/25R20 in inch sizing.
What does 29x18.00R20 mean?
29" overall diameter, 18.00" section width, radial, 20" rim.
What tire sizes are equivalent to 29x18.00R20?
On the same 20" rim, within 3% of the diameter: 29x15.00R20 (0.00%), 285/40R20 (-0.08%), 255/45R20 (+0.12%), 325/35R20 (-0.15%), 235/50R20 (+0.87%), 295/40R20 (+1.00%).
How many revolutions per mile does a 29x18.00R20 tire make?
About 695 revolutions per mile (circumference 91.1").
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.