AutoCar

My 407 is using Michelin Pilot Exalto 215 55 ZR17 94W, with max tyre pressure 350kPA.

The best tyre pressure after i tried many pressure so far is 240kPA for all tyres.

With 240kPA the car performs better in term of handling, less pressure may sacrifices handling and stability degraded. This can be feel when i driving my car. Remember that this car is equipped with ESP, correct tyre pressure will help ESP compute for optimum result.

Factory specified presure is 260kPa for front and 240kPa for rear tyres. With 260kPA the will feel hard and rough, lessen the comfort feeling due to louder tyres noise when running at rough and uneven road surface.

I set my front and rear tyre pressure at 240kPa, this is about 8% pressure reduction. From what i read from the trusted source, tyre pressure shall not below than 10% of specified pressure by the car manufacturer. Because of my 407 is superb in handling, car tyre pressure is important to compliment the stability system.