235/45R17 tire size
235/45R17 is a metric size: 25.3" tall, 9.3" wide, on a 17" rim — about a 25.5x9.50R17. The sidewall is 4.2" and the tire turns 796 times per mile.
235/45R17 specs
| Overall diameter (height) | 25.33" · 643 mm |
|---|---|
| Section width | 9.25" · 235 mm |
| Sidewall height | 4.16" · 106 mm (45% of width) |
| Rim diameter | 17" |
| Circumference | 79.57" · 2.021 m |
| Revolutions per mile | 796 (495 per km) |
| Inch (flotation) equivalent | 25.5x9.50R17 |
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" | -1.40% | -10 mm | 59.2 mph | compare → |
| 225/50R17 common | 25.86" | +2.10% | -10 mm | 61.3 mph | compare → |
| 215/45R17 common | 24.62" | -2.80% | -20 mm | 58.3 mph | compare → |
| 205/50R17 common | 25.07" | -1.01% | -30 mm | 59.4 mph | compare → |
| 215/55R17 common | 26.31" | +3.89% | -20 mm | 62.3 mph | compare → |
| 215/50R17 common | 25.46" | +0.54% | -20 mm | 60.3 mph | compare → |
| 245/45R17 common | 25.68" | +1.40% | +10 mm | 60.8 mph | compare → |
| 245/40R17 common | 24.72" | -2.41% | +10 mm | 58.6 mph | compare → |
| 205/45R17 common | 24.26" | -4.20% | -30 mm | 57.5 mph | compare → |
| 235/50R17 common | 26.25" | +3.65% | 0 mm | 62.2 mph | compare → |
| 255/40R17 common | 25.03" | -1.17% | +20 mm | 59.3 mph | compare → |
| 205/55R17 | 25.88" | +2.18% | -30 mm | 61.3 mph | compare → |
| 275/40R17 | 25.66" | +1.32% | +40 mm | 60.8 mph | compare → |
| 235/40R17 | 24.40" | -3.65% | 0 mm | 57.8 mph | compare → |
| 255/45R17 | 26.04" | +2.80% | +20 mm | 61.7 mph | compare → |
| 315/35R17 | 25.68" | +1.40% | +80 mm | 60.8 mph | compare → |
| 275/35R17 | 24.58" | -2.95% | +40 mm | 58.2 mph | calculate → |
| 335/35R17 | 26.23" | +3.58% | +100 mm | 62.1 mph | calculate → |
| 265/40R17 | 25.35" | +0.08% | +30 mm | 60.0 mph | calculate → |
| 155/70R17 | 25.54" | +0.85% | -80 mm | 60.5 mph | calculate → |
| 285/40R17 | 25.98" | +2.56% | +50 mm | 61.5 mph | calculate → |
| 195/60R17 | 26.21" | +3.50% | -40 mm | 62.1 mph | calculate → |
| 225/40R17 | 24.09" | -4.90% | -10 mm | 57.1 mph | calculate → |
| 295/35R17 | 25.13" | -0.78% | +60 mm | 59.5 mph | calculate → |
| 175/65R17 | 25.96" | +2.49% | -60 mm | 61.5 mph | calculate → |
| 145/80R17 | 26.13" | +3.19% | -90 mm | 61.9 mph | calculate → |
| 145/70R17 | 24.99" | -1.32% | -90 mm | 59.2 mph | calculate → |
| 185/60R17 | 25.74" | +1.63% | -50 mm | 61.0 mph | calculate → |
| 26x6.00R17 | 26.00" | +2.66% | -83 mm | 61.6 mph | calculate → |
| 165/70R17 | 26.09" | +3.03% | -70 mm | 61.8 mph | calculate → |
| 295/40R17 | 26.29" | +3.81% | +60 mm | 62.3 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" | -0.95% | -10 mm | 59.4 mph | compare → |
| 235/40R18 common | 25.40" | +0.30% | 0 mm | 60.2 mph | compare → |
| 215/55R16 common | 25.31" | -0.06% | -20 mm | 60.0 mph | compare → |
| 275/35R18 common | 25.58" | +0.99% | +40 mm | 60.6 mph | compare → |
| 265/35R18 common | 25.30" | -0.09% | +30 mm | 59.9 mph | compare → |
| 315/30R18 | 25.44" | +0.45% | +80 mm | 60.3 mph | compare → |
| 195/60R16 | 25.21" | -0.45% | -40 mm | 59.7 mph | calculate → |
| 155/60R18 | 25.32" | -0.02% | -80 mm | 60.0 mph | calculate → |
| 305/30R18 | 25.20" | -0.48% | +70 mm | 59.7 mph | calculate → |
| 205/45R18 | 25.26" | -0.25% | -30 mm | 59.9 mph | calculate → |
| 265/45R16 | 25.39" | +0.25% | +30 mm | 60.1 mph | calculate → |
| 145/80R16 | 25.13" | -0.76% | -90 mm | 59.5 mph | calculate → |
Try another size against 235/45R17
Questions
What size is 235/45R17 in inches?
235/45R17 is about 25.3" tall and 9.3" wide on a 17-inch rim — roughly a 25.5x9.50R17 in inch sizing.
What does 235/45R17 mean?
235 mm section width, sidewall 45% of the width (4.16"), radial construction, 17-inch rim.
What tire sizes are equivalent to 235/45R17?
On the same 17" rim, within 3% of the diameter: 265/40R17 (+0.08%), 215/50R17 (+0.54%), 295/35R17 (-0.78%), 155/70R17 (+0.85%), 205/50R17 (-1.01%), 255/40R17 (-1.17%).
How many revolutions per mile does a 235/45R17 tire make?
About 796 revolutions per mile (circumference 79.6").
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.