305/30R19 vs 265/30R20 tire size
265/30R20 vs 305/30R19, diameter
+0.2% taller
- Speedometer
- 59.9 mph
- At a true 60 mph
- Diameter
- 26.26 in
- Was 26.20 in
- Revs per mile
- 768
- Was 770
- 3% guideline
- Within
Car built for 305/30R19, now on 265/30R20.
305/30R19 and 265/30R20
| Measure | 305/30R19 | 265/30R20 | Difference |
|---|---|---|---|
| Width, mm | 305 | 265 | -40 |
| Sidewall, % of width | 30 | 30 | 0 |
| Rim, in | 19 | 20 | +1 |
| Section height, in | 3.60 | 3.13 | -0.47 |
| Diameter, in | 26.20 | 26.26 | +0.06 (+0.2%) |
| Circumference, in | 82.3 | 82.5 | +0.2 |
| Revs per mile | 770 | 768 | -2 (-0.2%) |
Fitting 265/30R20 instead of 305/30R19
Within the usual 3% diameter guideline.
- Needs 20 in wheels.
Cars with 305/30R19
Cars with 265/30R20
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