HL, XL and SL: the load rating on an EV tire
HL means High Load, XL means Extra Load and SL means Standard Load, and they describe how much weight a tire of a given size can carry. If your car came with HL, every replacement must be HL. Fitting a lower class to save money is not a saving, because the tire is then carrying more than it is rated to carry every time the car is loaded.
The three classes, in one paragraph
All three are the same physical size. What differs is the construction and the pressure the load rating is certified at. Standard Load is the baseline. Extra Load certifies its rating at a higher pressure, around 41 psi, and carries more. High Load certifies at about 50 psi and carries more again.
Continental's worked example is the clearest one published. In 245/40 R19, a standard load tire carries 670 kilos at load index 94. The Extra Load version carries 750 kilos at load index 98. The High Load version carries 825 kilos at load index 101. That is roughly 23 per cent more than standard and 11 per cent more than Extra Load, from a tire the same size.
Why High Load exists at all
The European standards body introduced it in 2021, and the reason was specifically electric cars. Battery packs had pushed curb weights past what Extra Load could support at a sensible pressure, and the alternative was fitting physically larger tires, which would have meant redesigning arches and suspension on cars that were otherwise finished.
So HL is not a marketing tier above XL. It is a different certification with a different reference pressure, created because the old ceiling had been reached.
The mistake everybody makes
HL is stamped before the size, not after it. A sidewall reads HL 245/40 R19 101Y, and the eye slides straight past two letters at the start of a string of numbers to find the bit it recognises.
XL, by contrast, is usually printed after the speed rating where people expect to find it. That asymmetry is the single reason this goes wrong.
What to do about it
Read your own placard. It is in the driver's door jamb and it gives the size, the load index, the speed rating and the pressure, for front and rear, for the tires the car was type approved with.
Match or exceed all four. Going up a load index is fine and is occasionally sensible on a car that tows or carries. Going down is never fine, whatever the fitter says about it being close enough.
If the placard says HL and a fitter offers you XL at a better price, that is not the same tire and it should not be the same conversation.
Common questions
- Can I fit XL tires if my car came with HL?
- No. HL carries roughly 11 per cent more than XL in the same size, and your car was type approved on the higher figure.
- Can I fit HL if my car came with XL?
- Yes. A higher construction class is an upgrade, not a risk. It may ride a little firmer.
- Where do I find my load index?
- On the placard in the driver's door jamb, and moulded into the tire sidewall after the size. It is the two or three digit number before the speed rating letter.
Last checked 2026-09-22. Where this page and your own vehicle disagree, the vehicle wins.