Mixing load ratings.

[Dr Nookie]

I m just getting some new rubber for my M Coupe but the tires I want - Potenza Sport Evo only come in 94 Y XL for the fronts and 91 Y for the rear.

Do I need to give a stuff about that? Scientifically I guess the firmer sidewall upfront could create a handling imbalance but in reality I’m not sure I’d ever notice.

The OE ratings are 90Y front and rear.

Otherwise I’ll just get PS5’s in correct sizes and matching ratings.

Cheers.

Edited by Dr Nookie on Monday 18th May 19:19

[Chris32345]

Unless your taking in on a track racing the difference between the tyres with be virtually unnoticeable

[Liamjrhodes]

You won't be able to tell a difference

[E-bmw]

They are both higher than standard but not enough to cause any issues, crack on.

[Matt_T]

I'd say don't run XLs on your car - they are designed for heavy cars (SUVs, commercial vans etc) and so have stiffer sidewalls. My choice would be to find a different tyre that is available.

[E-bmw]

Matt_T said:

I'd say don't run XLs on your car - they are designed for heavy cars (SUVs, commercial vans etc) and so have stiffer sidewalls. My choice would be to find a different tyre that is available.

But that isn't quite as categorical as would initially be obvious though.

For a start they are not designed for vans/SUVs otherwise why would they be made in standard car tyre sizes?

You can get XL rated tyres for city car sized wheels.

XL rated tyres will spec higher tyre pressures to compliment the additional sidewall strength, if you run them at the standard tyre pressures for the car the difference is very unlikely to be even noticed on the road.

[Smint]

Given the state of the roads any extra strength in the tyre is a bonus.