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Tire size

255/45R20 tire size: dimensions explained

Factory size on the Mercedes-Benz EQS Sedan. Below are the dimensions calculated from the size marking itself. Your vehicle's correct size, load index and speed rating are on the placard in the driver's door jamb; check it before buying.

MeasurementMetricImperial
Section width255 mm10.04 in
Sidewall height114.8 mm4.52 in
Overall diameter737.5 mm29.04 in
Wheel diameter508.0 mm20 in
Circumference2316 mm91.2 in
Revolutions per mile695

Calculated values: diameter = wheel + 2 × (width × aspect ratio). Real tires vary slightly by brand and model.

Reading the marking

255 is the section width in millimetres, 45 is the sidewall height as a percentage of that width, R means radial construction, and 20 is the wheel diameter in inches. A passenger (P or Euro-metric) tire and an LT tire in the same size are not interchangeable without checking load requirements.

Compare 255/45R20 with another size →

255/45R20 tires at Tire Rack

All-season

TireLoad/speedPrice per tire
Radar Dimax AS-8
Grand Touring All-Season		XL 105W$142.58View at Tire Rack
Sumitomo HTR A/S P03
Ultra High Performance All-Season		XL 105W$192.99View at Tire Rack

Highway / touring

TireLoad/speedPrice per tire
Kumho Crugen HP71
Crossover/SUV Touring All-Season		XL 105T$218.07View at Tire Rack
Falken ZIEX CT60 A/S
Crossover/SUV Touring All-Season		XL 105V$219.00View at Tire Rack

All-terrain

TireLoad/speedPrice per tire
Falken WildPeak A/T Trail
On-Road All-Terrain		XL 105V$232.00View at Tire Rack
Nitto Nomad Grappler
On-Road All-Terrain		XL 105V$259.00View at Tire Rack

Summer performance

TireLoad/speedPrice per tire
Cooper Zeon CrossRange
Street/Sport Truck Summer Truck		XL 105H$131.38View at Tire Rack
Cooper Zeon CrossRange
Street/Sport Truck Summer Truck		XL 105H$147.68View at Tire Rack

Winter

TireLoad/speedPrice per tire
Vredestein Wintrac Pro+
Performance Winter / Snow		XL 105V$258.83View at Tire Rack
Continental VikingContact 8
Studless Ice & Snow		XL 105T$301.99View at Tire Rack

Showing the lowest-priced in-stock options in each category from 125 255/45R20 tires in Tire Rack's feed, sorted by price only. We don't rank by commission. Match or exceed the load index and speed rating on your placard.

Affiliate links: if you buy through a Tire Rack link, RightTread may earn a commission through CJ. It doesn't change your price. Prices are Tire Rack's per-tire prices from Tire Rack's product feed as of Nov 7, 2026, 10:23 PM PT. Prices change, so confirm on Tire Rack before you buy. Disclosure

Other sizes