195/60R17 vs 225/45R18 tire size
225/45R18 vs 195/60R17, diameter
-0.9% shorter
- Speedometer
- 60.6 mph
- At a true 60 mph
- Diameter
- 25.97 in
- Was 26.21 in
- Revs per mile
- 777
- Was 769
- 3% guideline
- Within
Car built for 195/60R17, now on 225/45R18.
195/60R17 and 225/45R18
| Measure | 195/60R17 | 225/45R18 | Difference |
|---|---|---|---|
| Width, mm | 195 | 225 | +30 |
| Sidewall, % of width | 60 | 45 | -15 |
| Rim, in | 17 | 18 | +1 |
| Section height, in | 4.61 | 3.99 | -0.62 |
| Diameter, in | 26.21 | 25.97 | -0.24 (-0.9%) |
| Circumference, in | 82.3 | 81.6 | -0.8 |
| Revs per mile | 769 | 777 | +7 (+0.9%) |
Fitting 225/45R18 instead of 195/60R17
Within the usual 3% diameter guideline.
- Needs 18 in wheels.
- 30 mm wider. Check rubbing at full lock.
- Shorter sidewall: 0.6 in less.
Cars with 195/60R17
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