205/55R17 vs 245/45R17 tire size
245/45R17 vs 205/55R17, diameter
-0.8% shorter
- Speedometer
- 60.5 mph
- At a true 60 mph
- Diameter
- 25.68 in
- Was 25.88 in
- Revs per mile
- 785
- Was 779
- 3% guideline
- Within
Car built for 205/55R17, now on 245/45R17.
205/55R17 and 245/45R17
| Measure | 205/55R17 | 245/45R17 | Difference |
|---|---|---|---|
| Width, mm | 205 | 245 | +40 |
| Sidewall, % of width | 55 | 45 | -10 |
| Rim, in | 17 | 17 | 0 |
| Section height, in | 4.44 | 4.34 | -0.10 |
| Diameter, in | 25.88 | 25.68 | -0.20 (-0.8%) |
| Circumference, in | 81.3 | 80.7 | -0.6 |
| Revs per mile | 779 | 785 | +6 (+0.8%) |
Fitting 245/45R17 instead of 205/55R17
Within the usual 3% diameter guideline.
- 40 mm wider. Check rubbing at full lock.
Cars with 205/55R17
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