205/50R17 vs 295/30R18 tire size
295/30R18 vs 205/50R17, diameter
-0.4% shorter
- Speedometer
- 60.2 mph
- At a true 60 mph
- Diameter
- 24.97 in
- Was 25.07 in
- Revs per mile
- 808
- Was 804
- 3% guideline
- Within
Car built for 205/50R17, now on 295/30R18.
205/50R17 and 295/30R18
| Measure | 205/50R17 | 295/30R18 | Difference |
|---|---|---|---|
| Width, mm | 205 | 295 | +90 |
| Sidewall, % of width | 50 | 30 | -20 |
| Rim, in | 17 | 18 | +1 |
| Section height, in | 4.04 | 3.48 | -0.55 |
| Diameter, in | 25.07 | 24.97 | -0.10 (-0.4%) |
| Circumference, in | 78.8 | 78.4 | -0.3 |
| Revs per mile | 804 | 808 | +3 (+0.4%) |
Fitting 295/30R18 instead of 205/50R17
Within the usual 3% diameter guideline.
- Needs 18 in wheels.
- 90 mm wider. Check rubbing at full lock.
- Shorter sidewall: 0.6 in less.
Cars with 205/50R17
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