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Tire size

295/40R21 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 width295 mm11.61 in
Sidewall height118 mm4.65 in
Overall diameter769.4 mm30.29 in
Wheel diameter533.4 mm21 in
Circumference2418 mm95.2 in
Revolutions per mile666

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

Reading the marking

295 is the section width in millimetres, 40 is the sidewall height as a percentage of that width, R means radial construction, and 21 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 295/40R21 with another size →

295/40R21 tires at Tire Rack

All-season

TireLoad/speedPrice per tire
Pirelli Scorpion Zero AS Plus 3
Street/Sport Truck All-Season Truck		XL 111Y$306.57View at Tire Rack
Michelin Primacy Tour A/S
Grand Touring All-Season		XL 111V$378.92View at Tire Rack

Highway / touring

TireLoad/speedPrice per tire
Yokohama Geolandar X-CV
Crossover/SUV Touring All-Season		XL 111W$382.99View at Tire Rack
Bridgestone Alenza Prestige
Crossover/SUV Touring All-Season		XL 111W$426.99View at Tire Rack

Summer performance

TireLoad/speedPrice per tire
Pirelli Scorpion
Street/Sport Truck Summer Truck		XL 111H$205.69View at Tire Rack
Pirelli P Zero
Max Performance Summer		XL 111Y$210.78View at Tire Rack

Winter

TireLoad/speedPrice per tire
Vredestein Wintrac Pro+
Performance Winter / Snow		XL 111Y$312.44View at Tire Rack
Michelin X-Ice Snow SUV
Light Truck/SUV Studless Ice & Snow Truck		XL 111H$456.45View at Tire Rack

Showing the lowest-priced in-stock options in each category from 37 295/40R21 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