275/60R20 vs 285/60R20
Nominal diameter change: 1.43%. Compare both dimensions and the signed width and axle-height changes below.
- Overall diameter · A
- 32.99 in83.80 cm
- Overall diameter · B
- 33.46 in85.00 cm
- Width change
- +0.39 in+1.00 cm
- Ground clearance change
- +0.24 in+0.60 cm
1.43% larger diameter
Side view
Front view
- 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
- 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 shown at the same scale. Nominal dimensions. Photorealistic illustration; tread and wheel design are generic.
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 | +0.47 in+1.20 cm |
| Section width | 10.83 in27.50 cm | 11.22 in28.50 cm | +0.39 in+1.00 cm |
| Sidewall height | 6.50 in16.50 cm | 6.73 in17.10 cm | +0.24 in+0.60 cm |
| Circumference | 103.65 in263.27 cm | 105.13 in267.04 cm | +1.48 in+3.77 cm |
| Wheel diameter | 20.00 in50.80 cm | 20.00 in50.80 cm | 0.00 in0.00 cm |
| Revolutions / mi | 611.3 | 602.7 | -8.6 |
Speedometer check
Estimated actual speed60.9 mphAssumes the speedometer was calibrated for the original tire. Real rolling circumference varies.
Speedometer check
At an indicated 60 mph, the estimated actual speed becomes 60.9 mph with 285/60R20. The change comes from the ratio of new to original nominal circumference. The direction reverses if you swap the original and new tire.
Assumes the speedometer was calibrated for the original tire. Real rolling circumference varies.
What to check before changing size
Use the vehicle and tire specifications to check these three points:
- Vehicle placard and manual: match an approved size and the required load and speed ratings.
- Wheel specifications: check the tire maker’s wheel-width range and the wheel offset.
- Available space: check clearance at full steering lock and throughout suspension travel.