205/40R17 tire size
205/40R17 is a metric size: 23.5" tall, 8.1" wide, on a 17" rim — about a 23.5x8.00R17. The sidewall is 3.2" and the tire turns 860 times per mile.
205/40R17 specs
| Overall diameter (height) | 23.46" · 596 mm |
|---|---|
| Section width | 8.07" · 205 mm |
| Sidewall height | 3.23" · 82 mm (40% of width) |
| Rim diameter | 17" |
| Circumference | 73.69" · 1.872 m |
| Revolutions per mile | 860 (534 per km) |
| Inch (flotation) equivalent | 23.5x8.00R17 |
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 | |
|---|---|---|---|---|---|
| 215/45R17 common | 24.62" | +4.95% | +10 mm | 63.0 mph | compare → |
| 205/45R17 common | 24.26" | +3.44% | 0 mm | 62.1 mph | compare → |
| 235/40R17 | 24.40" | +4.03% | +30 mm | 62.4 mph | compare → |
| 215/40R17 | 23.77" | +1.34% | +10 mm | 60.8 mph | compare → |
| 275/35R17 | 24.58" | +4.78% | +70 mm | 62.9 mph | calculate → |
| 225/40R17 | 24.09" | +2.69% | +20 mm | 61.6 mph | calculate → |
| 195/45R17 | 23.91" | +1.93% | -10 mm | 61.2 mph | calculate → |
| 245/35R17 | 23.75" | +1.26% | +40 mm | 60.8 mph | calculate → |
| 195/40R17 | 23.14" | -1.34% | -10 mm | 59.2 mph | calculate → |
| 225/35R17 | 23.20" | -1.09% | +20 mm | 59.3 mph | calculate → |
| 215/35R17 | 22.93" | -2.27% | +10 mm | 58.6 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 | |
|---|---|---|---|---|---|
| 195/50R16 | 23.68" | +0.94% | -10 mm | 60.6 mph | compare → |
| 205/45R16 | 23.26" | -0.82% | 0 mm | 59.5 mph | compare → |
| 215/45R16 | 23.62" | +0.69% | +10 mm | 60.4 mph | calculate → |
| 235/30R18 | 23.55" | +0.40% | +30 mm | 60.2 mph | calculate → |
| 175/55R16 | 23.58" | +0.52% | -30 mm | 60.3 mph | calculate → |
| 185/50R16 | 23.28" | -0.74% | -20 mm | 59.6 mph | calculate → |
| 205/35R18 | 23.65" | +0.82% | 0 mm | 60.5 mph | calculate → |
Try another size against 205/40R17
Questions
What size is 205/40R17 in inches?
205/40R17 is about 23.5" tall and 8.1" wide on a 17-inch rim — roughly a 23.5x8.00R17 in inch sizing.
What does 205/40R17 mean?
205 mm section width, sidewall 40% of the width (3.23"), radial construction, 17-inch rim.
What tire sizes are equivalent to 205/40R17?
On the same 17" rim, within 3% of the diameter: 225/35R17 (-1.09%), 245/35R17 (+1.26%), 195/40R17 (-1.34%), 215/40R17 (+1.34%), 195/45R17 (+1.93%), 215/35R17 (-2.27%).
How many revolutions per mile does a 205/40R17 tire make?
About 860 revolutions per mile (circumference 73.7").
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.