Porsche Panamera's base and mid variants use sturdy tubeless radial tyres of sizes 245/50 ZR 18 and 275/45 ZR 18, respectively for the front and rear end. The Panamera Turbo wheels are 19-inches in size, while the tyre sizes of Panamera Turbo are 255/45 ZR 19 at the front, and 285/40 ZR 19 at the rear end. For all these tyres recommended tyre pressure is between 30-35 PSI. 35 PSI will give you better fuel economy while 30 PSI can be used for a smoother and more comfortable ride.
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