255/70R17
A 255/70R17 tire is 31.06 inches tall and 10.0 inches wide, with a 7.03-inch sidewall, mounted on a 17-inch wheel.
Common fitments: Tacoma, Frontier, Colorado
Overall diameter
31.06″
789 mm
Sidewall height
7.03″
178.5 mm
Tread width
255 mm
10.0″
Circumference
97.56″
8.1 ft
Revs per mile
649
404 per km
Wheel diameter
17″
aspect ratio 70%
Cross-section
- Overall diameter
- 31.06″
- Sidewall (each side)
- 7.03″
- Wheel
- 17″
255/70R17 in inches and millimeters
Every dimension of a 255/70R17, converted both ways. Calculated from the size code, accurate to about 1%.
| Measurement | Inches | Millimeters |
|---|---|---|
| Overall diameter (height) | 31.06″ | 789 mm |
| Tread width | 10.0″ | 255 mm |
| Sidewall height | 7.03″ | 178.5 mm |
| Wheel diameter | 17″ | 432 mm |
| Circumference | 97.56″ | 2478 mm |
Nominal dimensions from the size code. A real tire varies by a few millimeters between manufacturers, and a loaded tire sits slightly shorter than its free diameter.
255/70R17 compared with other sizes
All 31 practical swaps involving 255/70R17 — diameter change, speedometer impact and a fit verdict for each.
255/70R17 → 265/70R16
265/70R16
Diameter +1.5% · This fits
255/70R17 → 265/70R17
265/70R17
Diameter −1.7% · This fits
255/70R17 → 265/75R15
265/75R15
Diameter +1.3% · This fits
255/70R17 → 235/80R17
235/80R17
Diameter −2.4% · This fits
255/70R17 → 245/65R17
245/65R17
Diameter +5.1% · Too big a jump
255/70R17 → 245/70R17
245/70R17
Diameter +1.8% · This fits
255/70R17 → 245/75R17
245/75R17
Diameter −1.3% · This fits
255/70R17 → 255/65R17
255/65R17
Diameter +3.3% · Borderline. Check clearance first
275/65R17 → 255/70R17
275/65R17
Diameter +0.1% · This fits
245/75R17 → 255/70R17
245/75R17
Diameter +1.3% · This fits
265/65R17 → 255/70R17
265/65R17
Diameter −1.6% · This fits
265/70R17 → 255/70R17
265/70R17
Diameter +1.8% · This fits
245/70R17 → 255/70R17
245/70R17
Diameter −1.8% · This fits
255/65R17 → 255/70R17
255/65R17
Diameter −3.2% · Borderline. Check clearance first
255/75R17 → 255/70R17
255/75R17
Diameter +3.2% · Borderline. Check clearance first
235/80R17 → 255/70R17
235/80R17
Diameter +2.4% · This fits
275/70R17 → 255/70R17
275/70R17
Diameter +3.5% · Borderline. Check clearance first
255/65R18 → 255/70R17
255/65R18
Diameter −0.0% · This fits
255/60R19 → 255/70R17
255/60R19
Diameter −0.0% · This fits
245/65R17 → 255/70R17
245/65R17
Diameter −4.9% · Borderline. Check clearance first
275/60R18 → 255/70R17
275/60R18
Diameter −0.2% · This fits
285/70R17 → 255/70R17
285/70R17
Diameter +5.3% · Too big a jump
255/70R17 → 255/75R17
255/75R17
Diameter −3.1% · Borderline. Check clearance first
255/70R17 → 265/65R17
265/65R17
Diameter +1.6% · This fits
255/70R17 → 275/65R17
275/65R17
Diameter −0.1% · This fits
255/70R17 → 275/70R17
275/70R17
Diameter −3.4% · Borderline. Check clearance first
255/70R17 → 285/70R17
285/70R17
Diameter −5.1% · Too big a jump
255/70R17 → 255/65R18
255/65R18
Diameter +0.0% · This fits
255/70R17 → 255/60R19
255/60R19
Diameter +0.0% · This fits
255/70R17 → 275/55R19
275/55R19
Diameter +0.5% · This fits
255/70R17 → 225/45R17
225/45R17
Diameter +24.4% · Too big a jump
Common questions
- What is 255/70R17 in inches?
- A 255/70R17 tire is 31.06 inches tall and 10.0 inches wide, with a 7.03-inch sidewall, mounted on a 17-inch wheel. In metric that is 789 mm tall and 255 mm wide. The circumference is 97.56 inches.
- How tall is a 255/70R17 tire?
- 31.06 inches, or 789 mm. That is the overall diameter, wheel included. It turns about 649 times per mile, which is what your speedometer counts.
- What do the numbers in 255/70R17 mean?
- 255 is the tread width in millimeters, 70 is the aspect ratio — the sidewall height as a percentage of the tread width — and 17 is the wheel diameter in inches. So the sidewall is 255 × 70% = 178.5 mm tall.