Enter your sizes
Use a size such as 275/60R20. P/LT prefixes, XL/C markings and load/speed codes are accepted.
Compare tire sizes
Enter one size to convert it, or two sizes to compare dimensions, speedometer readings and wheel positions.
1.43% larger diameter
Axle-height change+6.00 mm+0.24 in+0.60 cm
Side view
Front view
A275/60R20
- Overall diameter
- 32.99 in83.80 cm
- Section width
- 10.83 in27.50 cm
- Sidewall height
- 6.50 in16.50 cm
- Wheel diameter
- 20.00 in50.80 cm
- Circumference
- 103.65 in263.27 cm
B285/60R20
- Overall diameter
- 33.46 in85.00 cm
- Section width
- 11.22 in28.50 cm
- Sidewall height
- 6.73 in17.10 cm
- Wheel diameter
- 20.00 in50.80 cm
- Circumference
- 105.13 in267.04 cm
Both tires use the same scale. Dimensions are calculated from the size codes. Tread and wheel designs are illustrative.
Swipe the table to see every measurement and change.
| Measurement | A · 275/60R20 | B · 285/60R20 | Change |
|---|---|---|---|
| Overall diameter | 32.99 in83.80 cm | 33.46 in85.00 cm | +12.00 mm+0.47 in+1.20 cm |
| Section width | 10.83 in27.50 cm | 11.22 in28.50 cm | +10.00 mm+0.39 in+1.00 cm |
| Sidewall height | 6.50 in16.50 cm | 6.73 in17.10 cm | +6.00 mm+0.24 in+0.60 cm |
| Circumference | 103.65 in263.27 cm | 105.13 in267.04 cm | +37.70 mm+1.48 in+3.77 cm |
| Wheel diameter | 20.00 in50.80 cm | 20.00 in50.80 cm | 0.00 mm0.00 in0.00 cm |
| Revolutions / mi | 611.3 | 602.7 | -8.6 |
Speedometer and distance
The estimate uses the size ratio, with the speedometer calibrated for tire A. A tire model’s rolling circumference can differ.
Estimated road speed60.9 mphDifference: +0.9 mph
Speed change+1.43%
| Speedometer reading (mph) | Estimated road speed (mph) | Difference (mph) |
|---|---|---|
| 20.0 | 20.3 | +0.3 |
| 30.0 | 30.4 | +0.4 |
| 40.0 | 40.6 | +0.6 |
| 50.0 | 50.7 | +0.7 |
| 60.0 | 60.9 | +0.9 |
| 70.0 | 71.0 | +1.0 |
| 80.0 | 81.1 | +1.1 |
| 90.0 | 91.3 | +1.3 |
Target speed, odometer and final-drive ratio
Speedometer reading needed59.2 mph
Estimated distance traveled101.4 mi
The odometer estimate uses the same tire-circumference ratio, with A as the original calibration.
Enter your current final-drive ratio to compare the gearing.
Assumes the same transmission gear. The second value is a calculated ratio to compare with available gear sets.
Wheels
Add each wheel’s width, ET and spacer thickness to compare its inner and outer edges.
Nearby sizes
Before changing size, check the tire maker’s measurements and the vehicle’s tire and wheel specifications.
275/60R20 115T is molded into the sidewall of this installed tire.
Sidewall, tread and wheel
Look for the size on the sidewall. Tread patterns and wheel designs vary by model.
This is the tread surface. Section width is measured across the sidewalls.
Product image: Continental Tire
The fine cuts in this winter tread are called sipes.
Product image: Continental Tire
A mounted wheel, with the brake disc and caliper behind the spokes.
How to compare tire sizes
Start with the size on your tire. Use the vehicle placard and the tire maker’s specifications when choosing a replacement.
Read the changes
Compare diameter, width and sidewall height, then check the speedometer and wheel-position results.
Check the wheel and vehicle
Check the approved size, load and speed ratings, wheel-width range, offset and space through steering and suspension travel.
Tire size conversions
Choose a size to see its diameter, width, sidewall and wheel dimensions.
275/60R20Overall diameter32.99 in83.80 cm265/70R17Overall diameter31.61 in80.28 cm285/75R16Overall diameter32.83 in83.39 cm275/65R18Overall diameter32.07 in81.47 cm285/60R20Overall diameter33.46 in85.00 cm305/55R20Overall diameter33.21 in84.35 cm295/70R17Overall diameter33.26 in84.48 cm235/85R16Overall diameter31.73 in80.59 cm