205/50R17 Tire Size
205/50R17 diameter, sidewall, revolutions per mile, and plus-sizing options.
The 205/50R17 tire size breaks down as: 205 mm section width, 50% aspect ratio, and a 17-inch rim. Below are its real, calculated dimensions.
205/50R17 Calculated Dimensions
| Metric | Value |
|---|---|
| Overall diameter | 25.1 in (637 mm) |
| Sidewall height | 4.0 in (102 mm) |
| Circumference | 78.8 in (2001 mm) |
| Revolutions per mile | 804 |
Typical Fitment
205/50R17 is most often found on sport sedans. Always confirm against the door-jamb placard or owner manual before fitting.
Plus-Sizing Alternatives
These sizes keep the overall diameter close to 205/50R17, so speedometer and gearing stay near stock:
| Size | Diameter | Diameter change |
|---|---|---|
| 215/50R17 | 25.46 in | +1.6% |
| 215/40R18 | 24.77 in | -1.2% |
| 225/35R19 | 25.20 in | +0.5% |
Speedometer Note
If you fit a 215/50R17 instead of 205/50R17, the diameter changes by +1.6%. 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 205/50R17 against any other size and see the exact diameter and speedometer difference.
Frequently Asked Questions
What does 205/50R17 mean?
205/50R17 means a 205 mm wide tire with a 50% 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 205/50R17?
Yes, as long as the replacement keeps the overall diameter close to stock so the speedometer stays accurate. Common plus-size moves from 205/50R17 are 215/50R17, 215/40R18, 225/35R19.
Will 205/50R17 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.