145/70R17 tire size
145/70R17 is a metric size: 25.0" tall, 5.7" wide, on a 17" rim — about a 25x5.50R17. The sidewall is 4.0" and the tire turns 807 times per mile.
145/70R17 specs
| Overall diameter (height) | 24.99" · 635 mm |
|---|---|
| Section width | 5.71" · 145 mm |
| Sidewall height | 4.00" · 102 mm (70% of width) |
| Rim diameter | 17" |
| Circumference | 78.52" · 1.994 m |
| Revolutions per mile | 807 (501 per km) |
| Inch (flotation) equivalent | 25x5.50R17 |
Equivalent sizes on a 17" 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 | |
|---|---|---|---|---|---|
| 225/45R17 common | 24.97" | -0.08% | +80 mm | 60.0 mph | calculate → |
| 225/50R17 common | 25.86" | +3.47% | +80 mm | 62.1 mph | calculate → |
| 215/45R17 common | 24.62" | -1.50% | +70 mm | 59.1 mph | calculate → |
| 205/50R17 common | 25.07" | +0.32% | +60 mm | 60.2 mph | calculate → |
| 215/50R17 common | 25.46" | +1.89% | +70 mm | 61.1 mph | calculate → |
| 235/45R17 common | 25.33" | +1.34% | +90 mm | 60.8 mph | calculate → |
| 245/45R17 common | 25.68" | +2.76% | +100 mm | 61.7 mph | calculate → |
| 245/40R17 common | 24.72" | -1.10% | +100 mm | 59.3 mph | calculate → |
| 205/45R17 common | 24.26" | -2.91% | +60 mm | 58.3 mph | calculate → |
| 255/40R17 common | 25.03" | +0.16% | +110 mm | 60.1 mph | calculate → |
| 205/55R17 | 25.88" | +3.54% | +60 mm | 62.1 mph | calculate → |
| 275/40R17 | 25.66" | +2.68% | +130 mm | 61.6 mph | calculate → |
| 235/40R17 | 24.40" | -2.36% | +90 mm | 58.6 mph | calculate → |
| 255/45R17 | 26.04" | +4.17% | +110 mm | 62.5 mph | calculate → |
| 315/35R17 | 25.68" | +2.76% | +170 mm | 61.7 mph | calculate → |
| 215/40R17 | 23.77" | -4.88% | +70 mm | 57.1 mph | calculate → |
| 275/35R17 | 24.58" | -1.65% | +130 mm | 59.0 mph | calculate → |
| 335/35R17 | 26.23" | +4.96% | +190 mm | 63.0 mph | calculate → |
| 265/40R17 | 25.35" | +1.42% | +120 mm | 60.9 mph | calculate → |
| 155/70R17 | 25.54" | +2.21% | +10 mm | 61.3 mph | calculate → |
| 225/40R17 | 24.09" | -3.62% | +80 mm | 57.8 mph | calculate → |
| 285/40R17 | 25.98" | +3.94% | +140 mm | 62.4 mph | calculate → |
| 195/60R17 | 26.21" | +4.88% | +50 mm | 62.9 mph | calculate → |
| 295/35R17 | 25.13" | +0.55% | +150 mm | 60.3 mph | calculate → |
| 175/65R17 | 25.96" | +3.86% | +30 mm | 62.3 mph | calculate → |
| 195/45R17 | 23.91" | -4.33% | +50 mm | 57.4 mph | calculate → |
| 145/80R17 | 26.13" | +4.57% | 0 mm | 62.7 mph | calculate → |
| 185/60R17 | 25.74" | +2.99% | +40 mm | 61.8 mph | calculate → |
| 26x6.00R17 | 26.00" | +4.03% | +7 mm | 62.4 mph | calculate → |
| 245/35R17 | 23.75" | -4.96% | +100 mm | 57.0 mph | calculate → |
| 165/70R17 | 26.09" | +4.41% | +20 mm | 62.6 mph | calculate → |
Plus / minus sizing: 16" and 18" rims
Same overall height on a different rim. Check wheel width and clearance before switching.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 225/40R18 common | 25.09" | +0.38% | +80 mm | 60.2 mph | calculate → |
| 205/55R16 common | 24.88" | -0.46% | +60 mm | 59.7 mph | calculate → |
| 255/35R18 common | 25.03" | +0.14% | +110 mm | 60.1 mph | calculate → |
| 225/50R16 common | 24.86" | -0.54% | +80 mm | 59.7 mph | calculate → |
| 245/35R18 common | 24.75" | -0.96% | +100 mm | 59.4 mph | calculate → |
| 215/40R18 | 24.77" | -0.88% | +70 mm | 59.5 mph | calculate → |
| 295/30R18 | 24.97" | -0.09% | +150 mm | 59.9 mph | calculate → |
| 195/60R16 | 25.21" | +0.88% | +50 mm | 60.5 mph | calculate → |
| 305/30R18 | 25.20" | +0.85% | +160 mm | 60.5 mph | calculate → |
| 145/80R16 | 25.13" | +0.57% | 0 mm | 60.3 mph | calculate → |
Try another size against 145/70R17
Questions
What size is 145/70R17 in inches?
145/70R17 is about 25.0" tall and 5.7" wide on a 17-inch rim — roughly a 25x5.50R17 in inch sizing.
What does 145/70R17 mean?
145 mm section width, sidewall 70% of the width (4.00"), radial construction, 17-inch rim.
What tire sizes are equivalent to 145/70R17?
On the same 17" rim, within 3% of the diameter: 225/45R17 (-0.08%), 255/40R17 (+0.16%), 205/50R17 (+0.32%), 295/35R17 (+0.55%), 245/40R17 (-1.10%), 235/45R17 (+1.34%).
How many revolutions per mile does a 145/70R17 tire make?
About 807 revolutions per mile (circumference 78.5").
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.