175/70R20 tire size
175/70R20 is a metric size: 29.6" tall, 6.9" wide, on a 20" rim — about a 29.5x7.00R20. The sidewall is 4.8" and the tire turns 680 times per mile.
175/70R20 specs
| Overall diameter (height) | 29.65" · 753 mm |
|---|---|
| Section width | 6.89" · 175 mm |
| Sidewall height | 4.82" · 123 mm (70% of width) |
| Rim diameter | 20" |
| Circumference | 93.13" · 2.366 m |
| Revolutions per mile | 680 (423 per km) |
| Inch (flotation) equivalent | 29.5x7.00R20 |
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" | -3.25% | +70 mm | 58.0 mph | calculate → |
| 255/45R20 common | 29.04" | -2.06% | +80 mm | 58.8 mph | calculate → |
| 255/50R20 common | 30.04" | +1.33% | +80 mm | 60.8 mph | calculate → |
| 275/40R20 common | 28.66" | -3.32% | +100 mm | 58.0 mph | calculate → |
| 265/50R20 common | 30.43" | +2.66% | +90 mm | 61.6 mph | calculate → |
| 245/50R20 common | 29.65" | 0.00% | +70 mm | 60.0 mph | calculate → |
| 275/45R20 common | 29.74" | +0.33% | +100 mm | 60.2 mph | calculate → |
| 255/55R20 common | 31.04" | +4.71% | +80 mm | 62.8 mph | calculate → |
| 235/55R20 common | 30.18" | +1.79% | +60 mm | 61.1 mph | calculate → |
| 265/45R20 common | 29.39" | -0.86% | +90 mm | 59.5 mph | calculate → |
| 315/35R20 common | 28.68" | -3.25% | +140 mm | 58.0 mph | calculate → |
| 275/50R20 common | 30.83" | +3.98% | +100 mm | 62.4 mph | calculate → |
| 295/40R20 | 29.29" | -1.20% | +120 mm | 59.3 mph | calculate → |
| 305/35R20 | 28.41" | -4.18% | +130 mm | 57.5 mph | calculate → |
| 285/40R20 | 28.98" | -2.26% | +110 mm | 58.6 mph | calculate → |
| 235/50R20 | 29.25" | -1.33% | +60 mm | 59.2 mph | calculate → |
| 285/45R20 | 30.10" | +1.53% | +110 mm | 60.9 mph | calculate → |
| 235/45R20 | 28.33" | -4.45% | +60 mm | 57.3 mph | calculate → |
| 295/45R20 | 30.45" | +2.72% | +120 mm | 61.6 mph | calculate → |
| 265/40R20 | 28.35" | -4.38% | +90 mm | 57.4 mph | calculate → |
| 305/40R20 | 29.61" | -0.13% | +130 mm | 59.9 mph | calculate → |
| 235/60R20 | 31.10" | +4.91% | +60 mm | 62.9 mph | calculate → |
| 325/35R20 | 28.96" | -2.32% | +150 mm | 58.6 mph | calculate → |
| 29x15.00R20 | 29.00" | -2.18% | +206 mm | 58.7 mph | calculate → |
| 29x18.00R20 | 29.00" | -2.18% | +282 mm | 58.7 mph | calculate → |
| 305/45R20 | 30.81" | +3.92% | +130 mm | 62.4 mph | calculate → |
| 31x18.00R20 | 31.00" | +4.57% | +282 mm | 62.7 mph | calculate → |
| 195/55R20 | 28.44" | -4.05% | +20 mm | 57.6 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 | |
|---|---|---|---|---|---|
| 245/55R19 common | 29.61" | -0.12% | +70 mm | 59.9 mph | calculate → |
| 265/50R19 common | 29.43" | -0.72% | +90 mm | 59.6 mph | calculate → |
| 275/40R21 | 29.66" | +0.05% | +100 mm | 60.0 mph | calculate → |
| 315/35R21 | 29.68" | +0.12% | +140 mm | 60.1 mph | calculate → |
| 245/45R21 | 29.68" | +0.12% | +70 mm | 60.1 mph | calculate → |
| 275/50R19 | 29.83" | +0.61% | +100 mm | 60.4 mph | calculate → |
| 295/45R19 | 29.45" | -0.65% | +120 mm | 59.6 mph | calculate → |
| 305/35R21 | 29.41" | -0.81% | +130 mm | 59.5 mph | calculate → |
Try another size against 175/70R20
Questions
What size is 175/70R20 in inches?
175/70R20 is about 29.6" tall and 6.9" wide on a 20-inch rim — roughly a 29.5x7.00R20 in inch sizing.
What does 175/70R20 mean?
175 mm section width, sidewall 70% of the width (4.82"), radial construction, 20-inch rim.
What tire sizes are equivalent to 175/70R20?
On the same 20" rim, within 3% of the diameter: 245/50R20 (0.00%), 305/40R20 (-0.13%), 275/45R20 (+0.33%), 265/45R20 (-0.86%), 295/40R20 (-1.20%), 255/50R20 (+1.33%).
How many revolutions per mile does a 175/70R20 tire make?
About 680 revolutions per mile (circumference 93.1").
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.