205/45R17 Tire Size
205/45R17 diameter, sidewall, revolutions per mile, and plus-sizing options.
The 205/45R17 tire size breaks down as: 205 mm section width, 45% aspect ratio, and a 17-inch rim. Below are its real, calculated dimensions.
205/45R17 Calculated Dimensions
| Metric | Value |
|---|---|
| Overall diameter | 24.3 in (616 mm) |
| Sidewall height | 3.6 in (92 mm) |
| Circumference | 76.2 in (1936 mm) |
| Revolutions per mile | 831 |
Typical Fitment
205/45R17 is most often found on sport compacts. Always confirm against the door-jamb placard or owner manual before fitting.
Plus-Sizing Alternatives
These sizes keep the overall diameter close to 205/45R17, so speedometer and gearing stay near stock:
| Size | Diameter | Diameter change |
|---|---|---|
| 215/45R17 | 24.62 in | +1.5% |
| 215/35R18 | 23.93 in | -1.4% |
| 225/30R19 | 24.31 in | +0.2% |
Speedometer Note
If you fit a 215/45R17 instead of 205/45R17, the diameter changes by +1.5%. A taller tire makes your speedometer read low — at a true 60 mph it would show roughly 59 mph. A shorter tire has the opposite effect, so the gauge reads high.
Use the tire calculator to compare 205/45R17 against any other size and see the exact diameter and speedometer difference.
Frequently Asked Questions
What does 205/45R17 mean?
205/45R17 means a 205 mm wide tire with a 45% sidewall aspect ratio mounted on a 17-inch rim. The aspect ratio is the sidewall height as a percentage of the width.
Can I plus-size from 205/45R17?
Yes, as long as the replacement keeps the overall diameter close to stock so the speedometer stays accurate. Common plus-size moves from 205/45R17 are 215/45R17, 215/35R18, 225/30R19.
Will 205/45R17 affect my speedometer?
Only if it differs in diameter from your original size. A taller tire reads low; a shorter tire reads high. Compare the two sizes with the calculator to find the percentage.