RightTread

Tire size

245/35R20 tire size: dimensions explained

Factory size on the Porsche 911 Carrera (992). 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 width245 mm9.65 in
Sidewall height85.8 mm3.38 in
Overall diameter679.5 mm26.75 in
Wheel diameter508.0 mm20 in
Circumference2134 mm84 in
Revolutions per mile754

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

Reading the marking

245 is the section width in millimetres, 35 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 245/35R20 with another size →

245/35R20 tires at Tire Rack

All-season

TireLoad/speedPrice per tire
Radar Dimax AS-8
Grand Touring All-Season		XL 95W$119.53View at Tire Rack
Falken ZIEX ZE960 A/S
Grand Touring All-Season		XL 95W$157.00View at Tire Rack

Summer performance

TireLoad/speedPrice per tire
Bridgestone Potenza S007
Max Performance Summer		XL 95Y$134.30View at Tire Rack
Bridgestone Potenza Sport
Max Performance Summer		XL 95Y$173.23View at Tire Rack

Winter

TireLoad/speedPrice per tire
Pirelli Winter Sottozero Serie II Run Flat
Performance Winter / Snow		XL 95V$277.79View at Tire Rack
Vredestein Wintrac Pro+
Performance Winter / Snow		XL 95Y$283.05View at Tire Rack

Showing the lowest-priced in-stock options in each category from 44 245/35R20 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