225/50R17 vs 225/45R18 tire size
225/45R18 vs 225/50R17, diameter
+0.4% taller
- Speedometer
- 59.7 mph
- At a true 60 mph
- Diameter
- 25.97 in
- Was 25.86 in
- Revs per mile
- 777
- Was 780
- 3% guideline
- Within
Car built for 225/50R17, now on 225/45R18.
225/50R17 and 225/45R18
| Measure | 225/50R17 | 225/45R18 | Difference |
|---|---|---|---|
| Width, mm | 225 | 225 | 0 |
| Sidewall, % of width | 50 | 45 | -5 |
| Rim, in | 17 | 18 | +1 |
| Section height, in | 4.43 | 3.99 | -0.44 |
| Diameter, in | 25.86 | 25.97 | +0.11 (+0.4%) |
| Circumference, in | 81.2 | 81.6 | +0.4 |
| Revs per mile | 780 | 777 | -3 (-0.4%) |
Fitting 225/45R18 instead of 225/50R17
Within the usual 3% diameter guideline.
- Needs 18 in wheels.
Cars with 225/50R17
Cars with 225/45R18
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