235/40R19 Tire Size
235/40R19 diameter, sidewall, revolutions per mile, and plus-sizing options.
The 235/40R19 tire size breaks down as: 235 mm section width, 40% aspect ratio, and a 19-inch rim. Below are its real, calculated dimensions.
235/40R19 Calculated Dimensions
| Metric | Value |
|---|---|
| Overall diameter | 26.4 in (671 mm) |
| Sidewall height | 3.7 in (94 mm) |
| Circumference | 82.9 in (2107 mm) |
| Revolutions per mile | 764 |
Typical Fitment
235/40R19 is most often found on sport sedans and coupes. Always confirm against the door-jamb placard or owner manual before fitting.
Plus-Sizing Alternatives
These sizes keep the overall diameter close to 235/40R19, so speedometer and gearing stay near stock:
| Size | Diameter | Diameter change |
|---|---|---|
| 245/40R19 | 26.72 in | +1.2% |
| 245/35R20 | 26.75 in | +1.3% |
| 255/25R21 | 26.02 in | -1.4% |
Speedometer Note
If you fit a 245/40R19 instead of 235/40R19, the diameter changes by +1.2%. 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 235/40R19 against any other size and see the exact diameter and speedometer difference.
Frequently Asked Questions
What does 235/40R19 mean?
235/40R19 means a 235 mm wide tire with a 40% sidewall aspect ratio mounted on a 19-inch rim. The aspect ratio is the sidewall height as a percentage of the width.
Can I plus-size from 235/40R19?
Yes, as long as the replacement keeps the overall diameter close to stock so the speedometer stays accurate. Common plus-size moves from 235/40R19 are 245/40R19, 245/35R20, 255/25R21.
Will 235/40R19 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.