LT315/70R17 Tire Size
LT315/70R17 diameter, sidewall, revolutions per mile, and plus-sizing options.
The LT315/70R17 tire size breaks down as: 315 mm section width, 70% aspect ratio, and a 17-inch rim. Below are its real, calculated dimensions.
LT315/70R17 Calculated Dimensions
| Metric | Value |
|---|---|
| Overall diameter | 34.4 in (873 mm) |
| Sidewall height | 8.7 in (220 mm) |
| Circumference | 108.0 in (2742 mm) |
| Revolutions per mile | 587 |
Typical Fitment
LT315/70R17 is most often found on off-road pickups. Always confirm against the door-jamb placard or owner manual before fitting.
Plus-Sizing Alternatives
These sizes keep the overall diameter close to LT315/70R17, so speedometer and gearing stay near stock:
| Size | Diameter | Diameter change |
|---|---|---|
| 325/70R17 | 34.91 in | +1.6% |
| 325/65R18 | 34.63 in | +0.8% |
| 335/60R19 | 34.83 in | +1.4% |
Speedometer Note
If you fit a 325/70R17 instead of LT315/70R17, 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 LT315/70R17 against any other size and see the exact diameter and speedometer difference.
Frequently Asked Questions
What does LT315/70R17 mean?
LT315/70R17 means a 315 mm wide tire with a 70% 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 LT315/70R17?
Yes, as long as the replacement keeps the overall diameter close to stock so the speedometer stays accurate. Common plus-size moves from LT315/70R17 are 325/70R17, 325/65R18, 335/60R19.
Will LT315/70R17 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.