215/45R17 vs 245/35R18 tire size
245/35R18 vs 215/45R17, diameter
+0.5% taller
- Speedometer
- 59.7 mph
- At a true 60 mph
- Diameter
- 24.75 in
- Was 24.62 in
- Revs per mile
- 815
- Was 819
- 3% guideline
- Within
Car built for 215/45R17, now on 245/35R18.
215/45R17 and 245/35R18
| Measure | 215/45R17 | 245/35R18 | Difference |
|---|---|---|---|
| Width, mm | 215 | 245 | +30 |
| Sidewall, % of width | 45 | 35 | -10 |
| Rim, in | 17 | 18 | +1 |
| Section height, in | 3.81 | 3.38 | -0.43 |
| Diameter, in | 24.62 | 24.75 | +0.13 (+0.5%) |
| Circumference, in | 77.3 | 77.8 | +0.4 |
| Revs per mile | 819 | 815 | -4 (-0.5%) |
Fitting 245/35R18 instead of 215/45R17
Within the usual 3% diameter guideline.
- Needs 18 in wheels.
- 30 mm wider. Check rubbing at full lock.
Cars with 215/45R17
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