245/70R17 vs 255/65R17 tire size
255/65R17 vs 245/70R17, diameter
-1.5% shorter
- Speedometer
- 60.9 mph
- At a true 60 mph
- Diameter
- 30.05 in
- Was 30.50 in
- Revs per mile
- 671
- Was 661
- 3% guideline
- Within
Car built for 245/70R17, now on 255/65R17.
245/70R17 and 255/65R17
| Measure | 245/70R17 | 255/65R17 | Difference |
|---|---|---|---|
| Width, mm | 245 | 255 | +10 |
| Sidewall, % of width | 70 | 65 | -5 |
| Rim, in | 17 | 17 | 0 |
| Section height, in | 6.75 | 6.53 | -0.23 |
| Diameter, in | 30.50 | 30.05 | -0.45 (-1.5%) |
| Circumference, in | 95.8 | 94.4 | -1.4 |
| Revs per mile | 661 | 671 | +10 (+1.5%) |
Fitting 255/65R17 instead of 245/70R17
Within the usual 3% diameter guideline.
Cars with 245/70R17
Cars with 255/65R17
What this cannot tell you
Diameter within 3% is a common shop guideline, not a maker spec.
Load index, offset and clearance are not in this data.
- Two or more sources agree
- One source
- Model-level or estimate
- Sources differ