275/45R21 vs 275/50R20
275/50R20 is 2.0 mm taller than 275/45R21 in overall diameter (+0.3%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 275/50R20 fitted, the speedometer reads 100 km/h when you are doing 100.3 km/h.
Dimensions side by side
| 275/45R21 | 275/50R20 | |
|---|---|---|
| Overall diameter | 781 mm (30.7″) | 783 mm (30.8″) |
| Section width | 275 mm | 275 mm |
| Sidewall height | 124 mm | 138 mm |
| Rim | 21″ | 20″ |
| Revolutions per km | 408 | 407 |
| In stock | 30 tires from $216.00 | 33 tires from $183.00 |
What changes
- Overall diameter: 275/50R20 is 2.0 mm taller (+0.3%).
- Speedometer: reads 100 km/h at an actual 100.3 km/h with 275/50R20.
- Wheel size changes from 21″ 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 275/45R21
Vehicles that use 275/50R20
See every alternate size for 275/45R21
Frequently asked questions
Can I use 275/50R20 instead of 275/45R21?
Usually, yes: 275/50R20 is within 3% of the overall diameter of 275/45R21 (+0.3%). 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 275/45R21 and 275/50R20?
With 275/50R20 instead of 275/45R21, the speedometer shows 100 km/h when you are actually doing 100.3 km/h.
Which vehicles came with both 275/45R21 and 275/50R20?
Both sizes were original equipment, on different trims or packages, on the 2020–2024 Mercedes-Benz GLE350, 2020–2024 Mercedes-Benz GLE450, 2021–2024 Mercedes-Benz GLE53, 2020–2024 Mercedes-Benz GLE580, 2020–2024 Mercedes-Benz GLS450, 2024 Mercedes-Benz GLE450e.