RightTread

Tire size

285/45R20 tire size: dimensions explained

Factory size on the Porsche Macan Electric. 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 width285 mm11.22 in
Sidewall height128.3 mm5.05 in
Overall diameter764.5 mm30.1 in
Wheel diameter508.0 mm20 in
Circumference2403 mm94.6 in
Revolutions per mile670

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

Reading the marking

285 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 285/45R20 with another size →

285/45R20 tires at Tire Rack

All-season

TireLoad/speedPrice per tire
Vredestein Quatrac Pro+
Grand Touring All-Season		XL 112Y$329.77View at Tire Rack
Goodyear Assurance WeatherReady2
Grand Touring All-Season		XL 112V$399.99View at Tire Rack

Highway / touring

TireLoad/speedPrice per tire
Pirelli Scorpion MS
Crossover/SUV Touring All-Season		XL 112V$308.16View at Tire Rack
Yokohama Geolandar X-CV
Crossover/SUV Touring All-Season		XL 112W$328.99View at Tire Rack

Summer performance

TireLoad/speedPrice per tire
Bridgestone Turanza T005
Grand Touring Summer		XL 112W$251.09View at Tire Rack
Bridgestone Potenza Sport
Max Performance Summer		XL 112Y$281.66View at Tire Rack

Winter

TireLoad/speedPrice per tire
Vredestein Wintrac Pro+
Performance Winter / Snow		XL 112W$282.86View at Tire Rack
Michelin X-Ice Snow SUV
Light Truck/SUV Studless Ice & Snow Truck		XL 112H$293.89View at Tire Rack

Showing the lowest-priced in-stock options in each category from 35 285/45R20 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, 9:19 PM PT. Prices change, so confirm on Tire Rack before you buy. Disclosure

Other sizes