245/50R19 vs 305/35R20 tire size
305/35R20 vs 245/50R19, diameter
-0.8% shorter
- Speedometer
- 60.5 mph
- At a true 60 mph
- Diameter
- 28.41 in
- Was 28.65 in
- Revs per mile
- 710
- Was 704
- 3% guideline
- Within
Car built for 245/50R19, now on 305/35R20.
245/50R19 and 305/35R20
| Measure | 245/50R19 | 305/35R20 | Difference |
|---|---|---|---|
| Width, mm | 245 | 305 | +60 |
| Sidewall, % of width | 50 | 35 | -15 |
| Rim, in | 19 | 20 | +1 |
| Section height, in | 4.82 | 4.20 | -0.62 |
| Diameter, in | 28.65 | 28.41 | -0.24 (-0.8%) |
| Circumference, in | 90.0 | 89.2 | -0.8 |
| Revs per mile | 704 | 710 | +6 (+0.8%) |
Fitting 305/35R20 instead of 245/50R19
Within the usual 3% diameter guideline.
- Needs 20 in wheels.
- 60 mm wider. Check rubbing at full lock.
- Shorter sidewall: 0.6 in less.
Cars with 245/50R19
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