Just got some new boots

[hodroyd]

I believe some tyre manufacturers account for cars that use the same ttyre size, but are for example heavier, so they build one with extra wall thickness to accomodate the weight, such as Mercedes..!!

 

[hodroyd]

This is the correct fitment type for the 4200 for example: 265/35ZR18 (97Y) XL TL PILOT SPORT 3
The brand can be whatever, but the fitment type I believe is the XL TL

 

[Chrisbassett]

Just checked and my Falken 453's are rated Extra Load, max weight 730kg, max pressure 50psi.

XL means...(stolen from the internets)

Extra Load tyres are designed to be used at higher pressures than normal tyres. They have the same maximum load capacity as a normal tyre with the same Load Index but achieve this at a higher pressure. Normal tyres are inflated to pressures between 2 bar and 2.5 bar. They reach the maximum load capacity as specified by the Load Index when inflated to 2.5 bar (35psi) Eg for a Load Index of 94 this is 670kg. Extra Load tyres can be inflated to pressures up to 2.9 bar (41psi) and actually have a lower load capacity at the same pressure as a normal tyre with the same Load Index. To get the 670kg load capacity for a Load Index of 94, an Extra Load tyre must be inflated to 2.9 bar. At 2.5bar it will only have a load capacity of 595kg.

 

[hodroyd]

When you put your foot down from a start position in the Maser, the generated heat will lift the pressure much more than a slower car with the same tyre..!!