Check to make sure your order is complete for registration, placard load and speed rating, and if the 2005 GS300 and GS300 SE models have the 17-inch wheels instead of the SE-L 18-inch wheels. The possible tyre options for the Lexus GS 300 at Tyres.co.uk are the Michelin CrossClimate 3 and the Goodyear EfficientGrip Performance 2, both in 225/50 R17 94W.
You will find the Lexus GS 300 tyre size and pressure placard on the driver's door post where it will be visible when the door is opened. It shows the original equipment tyres and their cold pressures. Remember to use this placard for your exact car, as GS 300 wheels and trim levels vary.
Usually, you don't have to replace all four Lexus GS 300 tyres at the same time. Replaced tyres should be done on an axle pair basis. In this case, it is preferred to fit the new axle pair tyres to the rear axle. The GS 300 AWD tyres, however, must all be replaced at the same time with like equivalent tyres in size, brand, tread pattern and tread depth. If an equivalent match cannot be achieved, all four tyres must be replaced.