255/50R19 vs 265/45R20

265/45R20 is 9.0 mm taller than 255/50R19 in overall diameter (+1.2%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 265/45R20 fitted, the speedometer reads 100 km/h when you are doing 101.2 km/h.

Dimensions side by side

	255/50R19	265/45R20
Overall diameter	738 mm (29.1″)	747 mm (29.4″)
Section width	255 mm	265 mm
Sidewall height	128 mm	119 mm
Rim	19″	20″
Revolutions per km	431	426
In stock	56 tires from $160.00	38 tires from $162.00

What changes

Overall diameter: 265/45R20 is 9.0 mm taller (+1.2%).
Speedometer: reads 100 km/h at an actual 101.2 km/h with 265/45R20.
265/45R20 is 10 mm wider, so check clearance and the recommended rim width.
Wheel size changes from 19″ 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 255/50R19

Vehicles that use 265/45R20

See every alternate size for 255/50R19

Frequently asked questions

Can I use 265/45R20 instead of 255/50R19?

Usually, yes: 265/45R20 is within 3% of the overall diameter of 255/50R19 (+1.2%). 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 255/50R19 and 265/45R20?

With 265/45R20 instead of 255/50R19, the speedometer shows 100 km/h when you are actually doing 101.2 km/h.

Which vehicles came with both 255/50R19 and 265/45R20?

Both sizes were original equipment, on different trims or packages, on the 2015–2024 Porsche Macan, 2016–2019 Mercedes-Benz GLE350, 2016–2018 Mercedes-Benz GLE550e, 2016–2017 Mercedes-Benz GLE400, 2016 Mercedes-Benz GLE300d, 2006–2015 Mercedes-Benz ML350.