265/65R18 vs 275/55R20
275/55R20 is 9.0 mm taller than 265/65R18 in overall diameter (+1.1%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 275/55R20 fitted, the speedometer reads 100 km/h when you are doing 101.1 km/h.
Dimensions side by side
| 265/65R18 | 275/55R20 | |
|---|---|---|
| Overall diameter | 802 mm (31.6″) | 811 mm (31.9″) |
| Section width | 265 mm | 275 mm |
| Sidewall height | 172 mm | 151 mm |
| Rim | 18″ | 20″ |
| Revolutions per km | 397 | 392 |
| In stock | 31 tires from $178.00 | 58 tires from $195.00 |
What changes
- Overall diameter: 275/55R20 is 9.0 mm taller (+1.1%).
- Speedometer: reads 100 km/h at an actual 101.1 km/h with 275/55R20.
- 275/55R20 is 10 mm wider, so check clearance and the recommended rim width.
- Wheel size changes from 18″ to 20″: you need wheels in the new size.
- Choose a load index at least as high as the one on your door placard.
Vehicles that came with both sizes
Vehicles that use 265/65R18
Vehicles that use 275/55R20
See every alternate size for 265/65R18
Frequently asked questions
Can I use 275/55R20 instead of 265/65R18?
Usually, yes: 275/55R20 is within 3% of the overall diameter of 265/65R18 (+1.1%). Use wheels of the right size and width, match or exceed the original load index, and check clearance at full steering lock.
How much does the speedometer change between 265/65R18 and 275/55R20?
With 275/55R20 instead of 265/65R18, the speedometer shows 100 km/h when you are actually doing 101.1 km/h.
Which vehicles came with both 265/65R18 and 275/55R20?
Both sizes were original equipment, on different trims or packages, on the 2007–2020, 2022 GMC Yukon, 2008–2020 Chevrolet Tahoe, 2010–2020 Chevrolet Suburban, 2007–2018 Chevrolet Silverado, 2007–2018 GMC Sierra.