scud8

iTrader: (1)

As subject. Specifically what is the relationship between XL and the numerical load rating of a tyre? Googling it doesn't give a good answer, some sites just say it means extra load (but don't explain the relationship to the numerical load rating) and other talk about it being related to inflation pressure (ie. XL is required if the tyre must be inflated to higher pressures).

dunx

iTrader: (3)

eXtra Load

Usually manifest in the form of stiffer side-walls, ideal for a heavy Scoob.

dunx

trogg

Yea eXtra Load is what it stands for, but XL tyres are rated at the same weight limit as the same non XL tyre.

I have a set on my car at the moment.

scud8

iTrader: (1)

So what's the difference between a 94Y and 94Y XL tyre? Both are rated to 670Kg, so what is the difference?

TonyBurns

iTrader: (3)

Normally stronger side walls afaik.

Tony

TurboAndy

iTrader: (1)

As has been said. Stiffer side walls to cope with heaver loads.

dunx

iTrader: (3)

Web theft yields the following...

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.