265/40R20 vs 305/35R20 tire size
305/35R20 vs 265/40R20, diameter
+0.2% taller
- Speedometer
- 59.9 mph
- At a true 60 mph
- Diameter
- 28.41 in
- Was 28.35 in
- Revs per mile
- 710
- Was 711
- 3% guideline
- Within
Car built for 265/40R20, now on 305/35R20.
265/40R20 and 305/35R20
| Measure | 265/40R20 | 305/35R20 | Difference |
|---|---|---|---|
| Width, mm | 265 | 305 | +40 |
| Sidewall, % of width | 40 | 35 | -5 |
| Rim, in | 20 | 20 | 0 |
| Section height, in | 4.17 | 4.20 | +0.03 |
| Diameter, in | 28.35 | 28.41 | +0.06 (+0.2%) |
| Circumference, in | 89.1 | 89.2 | +0.2 |
| Revs per mile | 711 | 710 | -1 (-0.2%) |
Fitting 305/35R20 instead of 265/40R20
Within the usual 3% diameter guideline.
- 40 mm wider. Check rubbing at full lock.
Cars with 265/40R20
Cars with 305/35R20
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