215/65R17 vs 245/50R18 tire size
245/50R18 vs 215/65R17, diameter
-1.3% shorter
- Speedometer
- 60.8 mph
- At a true 60 mph
- Diameter
- 27.65 in
- Was 28.00 in
- Revs per mile
- 730
- Was 720
- 3% guideline
- Within
Car built for 215/65R17, now on 245/50R18.
215/65R17 and 245/50R18
| Measure | 215/65R17 | 245/50R18 | Difference |
|---|---|---|---|
| Width, mm | 215 | 245 | +30 |
| Sidewall, % of width | 65 | 50 | -15 |
| Rim, in | 17 | 18 | +1 |
| Section height, in | 5.50 | 4.82 | -0.68 |
| Diameter, in | 28.00 | 27.65 | -0.36 (-1.3%) |
| Circumference, in | 88.0 | 86.9 | -1.1 |
| Revs per mile | 720 | 730 | +9 (+1.3%) |
Fitting 245/50R18 instead of 215/65R17
Within the usual 3% diameter guideline.
- Needs 18 in wheels.
- 30 mm wider. Check rubbing at full lock.
- Shorter sidewall: 0.7 in less.
Cars with 215/65R17
Cars with 245/50R18
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