[felixlamb]

Hey,

I’m looking to purchase a set of all-season tyres for our UK winter. The alloys are on their way already.

I’m going for a 245/35/19 square set up, so I can rotate the tyres as necessary in the future.

However, the majority of good tyres in this size only have a load rating of 93 (650kg), whereas the OEM ZTK rears have a rating of 96 (710kg).
650kg per tyre is 1300kg per axle still, and 2600kg total, which seems plenty sufficient?

Now, given it’s winter, I’m hardly going to be hooning it around the place, so… will a 93 load rating be okay?

My gut is yes, as some of the allowed tyre options are 225/40/19 93Y (same load rating) and 225/30/20 92Y (lower load rating), but they are different sizes and profiles.

Source: https://g20.bimmerpost.com/forums/sh...34&postcount=2

[Pentland]

Winter Continental Winter Contact TS860 SSR are the BMW recommended and star marked winter tyres. Fronts are 93H and rear 96H. Staggered set up.


EDIT:
My sizes on zkt - BMW approved.
225/40 19 93H and 255/35 19 96H

[ILikeBimmers]

Online I'm finding that the minimum load index is 92 https://tirepressure.org/bmw/m240i-xdrive/2022#Coupe. The bigger concern I'd warn about is that generally it's encouraged to minus size tires as the larger contact patch is more vulnerable to snow float. I believe square setups are also better for winter stability and also tire rotation.

Here is a comparison with the 19" rims you are going to choose with what I have for my winter setup which is an 18" Michelin X-Ice Snow tire for visual comparison: https://www.calculator.net/tire-size...culate#compare.

I also have the ZTK (High Performance Tire and Cooling Package) and 18" rims, as far as OEM goes, will clear the larger brakes that the ZTK variants come with. If you're going with a second set of rims, you can double check with the people who will balance the tires on the rims for clearance, as I'm assuming you don't have that equipment at home since you're asking about tires here.

[felixlamb]

It’s a toss up between 225/40/19 or 245/35/19 then I think…

[DAXXR]

All uk m240i are xdrive, so your car will not be happy with different sized tyres than standard.
Just get the correct sized fronts and rears.

[Pentland]

Note that, as is the case with the winter tyres I suggested, BMW advise a speed restriction on the vehicle of 130mph. They even offer a specific sticker for you to attach to the dash to indicate the fitment of winter tyres and the associated speed reduction. I think it’s law to do this in Germany.

That would then raise the question, should your speed be similarly limited if using cross climates?
I’m not suggesting that anyone in the UK would be driving at 130mph let alone maxing out at 155mph on public roads but you should be aware of any limitations with tyre choice.

[felixlamb]

Originally Posted by DAXXR

All uk m240i are xdrive, so your car will not be happy with different sized tyres than standard.
Just get the correct sized fronts and rears.

245/35 / 255/35 (ZTK) is a 1.07% difference.
225/40 / 255/35 (non-ZTK) is a -0.23% difference.
245/35 / 245/35 is a 0% difference.

Explain why the car won’t be happy? That’s well within the tolerance permitted by the existing OEM options available.

[Pentland]

Originally Posted by felixlamb

245/35 / 255/35 (ZTK) is a 1.07% difference.
225/40 / 255/35 (non-ZTK) is a -0.23% difference.
245/35 / 245/35 is a 0% difference.

Explain why the car won’t be happy? That’s well within the tolerance permitted by the existing OEM options available.

The tolerance is cross axle not front to back. You’ll be fine.