235/40R17 tire size
235/40R17 is a metric size: 24.4" tall, 9.3" wide, on a 17" rim — about a 24.5x9.50R17. The sidewall is 3.7" and the tire turns 827 times per mile.
235/40R17 specs
| Overall diameter (height) | 24.40" · 620 mm |
|---|---|
| Section width | 9.25" · 235 mm |
| Sidewall height | 3.70" · 94 mm (40% of width) |
| Rim diameter | 17" |
| Circumference | 76.66" · 1.947 m |
| Revolutions per mile | 827 (514 per km) |
| Inch (flotation) equivalent | 24.5x9.50R17 |
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" | +2.34% | -10 mm | 61.4 mph | compare → |
| 215/45R17 common | 24.62" | +0.89% | -20 mm | 60.5 mph | compare → |
| 205/50R17 common | 25.07" | +2.74% | -30 mm | 61.6 mph | compare → |
| 215/50R17 common | 25.46" | +4.36% | -20 mm | 62.6 mph | compare → |
| 235/45R17 common | 25.33" | +3.79% | 0 mm | 62.3 mph | compare → |
| 205/45R17 common | 24.26" | -0.56% | -30 mm | 59.7 mph | compare → |
| 245/40R17 common | 24.72" | +1.29% | +10 mm | 60.8 mph | compare → |
| 255/40R17 common | 25.03" | +2.58% | +20 mm | 61.5 mph | compare → |
| 205/40R17 | 23.46" | -3.87% | -30 mm | 57.7 mph | compare → |
| 215/40R17 | 23.77" | -2.58% | -20 mm | 58.5 mph | compare → |
| 275/35R17 | 24.58" | +0.73% | +40 mm | 60.4 mph | calculate → |
| 225/40R17 | 24.09" | -1.29% | -10 mm | 59.2 mph | calculate → |
| 265/40R17 | 25.35" | +3.87% | +30 mm | 62.3 mph | calculate → |
| 155/70R17 | 25.54" | +4.68% | -80 mm | 62.8 mph | calculate → |
| 195/45R17 | 23.91" | -2.02% | -40 mm | 58.8 mph | calculate → |
| 295/35R17 | 25.13" | +2.98% | +60 mm | 61.8 mph | calculate → |
| 145/70R17 | 24.99" | +2.42% | -90 mm | 61.5 mph | calculate → |
| 245/35R17 | 23.75" | -2.66% | +10 mm | 58.4 mph | calculate → |
| 225/35R17 | 23.20" | -4.92% | -10 mm | 57.0 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 | |
|---|---|---|---|---|---|
| 195/55R16 common | 24.44" | +0.18% | -40 mm | 60.1 mph | compare → |
| 205/40R18 | 24.46" | +0.23% | -30 mm | 60.1 mph | compare → |
| 225/35R18 | 24.20" | -0.82% | -10 mm | 59.5 mph | calculate → |
| 235/35R18 | 24.48" | +0.31% | 0 mm | 60.2 mph | calculate → |
| 175/60R16 | 24.27" | -0.55% | -60 mm | 59.7 mph | calculate → |
| 215/50R16 | 24.46" | +0.26% | -20 mm | 60.2 mph | calculate → |
Try another size against 235/40R17
Questions
What size is 235/40R17 in inches?
235/40R17 is about 24.4" tall and 9.3" wide on a 17-inch rim — roughly a 24.5x9.50R17 in inch sizing.
What does 235/40R17 mean?
235 mm section width, sidewall 40% of the width (3.70"), radial construction, 17-inch rim.
What tire sizes are equivalent to 235/40R17?
On the same 17" rim, within 3% of the diameter: 205/45R17 (-0.56%), 275/35R17 (+0.73%), 215/45R17 (+0.89%), 225/40R17 (-1.29%), 245/40R17 (+1.29%), 195/45R17 (-2.02%).
How many revolutions per mile does a 235/40R17 tire make?
About 827 revolutions per mile (circumference 76.7").
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.