[pbonsalb]

I’d measure with a cloth tape just for curiosity’s sake.

[haru69]

Originally Posted by pbonsalb

I’d measure with a cloth tape just for curiosity’s sake.

Well both continental and seller refuse to take any responsibility even to is sure is tire related so.. I probably just buy new tires different brand I guess

[DomMuc]

Originally Posted by haru69

Well both continental and seller refuse to take any responsibility even to is sure is tire related so.. I probably just buy new tires different brand I guess

* with star marking...

[haru69]

Originally Posted by DomMuc

* with star marking...

the issue there is not really many sporty star rated tires for my car they are mostly pz4 or ps5
i wanted something more

[tracer bullet]

Originally Posted by haru69

Well both continental and seller refuse to take any responsibility even to is sure is tire related so.. I probably just buy new tires different brand I guess

Do you have any legal options? I don't mean that it's worth trying to "take them to court" but is there a law relating to the tire installer having to provide you something that works for your car? Did you buy the tires with them, for example, or buy them elsewhere and they only did the installation?

[haru69]

Originally Posted by tracer bullet

Do you have any legal options? I don't mean that it's worth trying to "take them to court" but is there a law relating to the tire installer having to provide you something that works for your car? Did you buy the tires with them, for example, or buy them elsewhere and they only did the installation?

There is legal option but they are time and money consuming
Unfortunately is just not worth it in my country , I will indeed lose more money wasting so much time on this

[ShocknAwe]

Problem is buying an X drive car. What strange sizes too. Might as well have done square! 245/255 isnt what I would consider staggered.

Are they directional and mounted backwards?

[rcsummers]

There is a 1% size difference between the two tires. This will set off the x-drive.

https://www.willtheyfit.com/

[BeEmVe]

Originally Posted by haru69

I went to both the BMW dealership and where I bought these tires. Both told me one tire has a slightly different diameter, which is why the traction control senses one tire slipping more than the other and cuts power while accelerating

If one tire has a slightly different diameter hopefully larger, why not have a tire shop shave it down? Or replace it? If smaller then, well why not have a tire shop shave the other three down?

[G30M]

Originally Posted by Hit_Apex

This whole story is weird. I'm having trouble believing one tire was made >1% larger than the other in the same labeled size. I'm not surprised by Conti's response to use star tires, but interesting that they claim tighter manufacturing tolerances - I've not heard that before. 'Kook FTW. Maybe try again with Michelin.

When I bought a replacement tire a few years back for my AWD Subaru l, exact same spec tire Bridgestone Potenza RE050, it was smaller by 3%. Car was made in Japan and predated the replacement tire by 5 years. So different country, different year, possibly different factories and different mould.

[haru69]

Originally Posted by rcsummers

There is a 1% size difference between the two tires. This will set off the x-drive.

https://www.willtheyfit.com/

Then why there is no problem with the OEM tires (same size)
And there is also other people with this same continental tire and had no issue with my same size
That's just a defective tire

[haru69]

Originally Posted by BeEmVe

If one tire has a slightly different diameter hopefully larger, why not have a tire shop shave it down? Or replace it? If smaller then, well why not have a tire shop shave the other three down?

they basically dont give a f
they have contacted continental they gave this response so is basically just my problem now

[haru69]

Originally Posted by G30M

When I bought a replacement tire a few years back for my AWD Subaru l, exact same spec tire Bridgestone Potenza RE050, it was smaller by 3%. Car was made in Japan and predated the replacement tire by 5 years. So different country, different year, possibly different factories and different mould.

could be the issue 1 pair is from germany and other set is from slovenia/slovakia

[rcsummers]

Upload a picture of the door sticker.....

I'm not accusing you of anything but 245/255 doesn't seem like any OEM combo I've seen before. They'd either be a square setup, or usually a 245 would be paired with a 275 in OEM BMW specs on the f10 and a 225 would be paired with a 255 on the f32 in OEM BMW specs.

I'd be happy to admit I'm wrong though.

The hankooks could have different rolling diameters than the conti's. a 245 hankook isnt always the same exact size as a 245 continental even though they're both 245's.

[haru69]

Originally Posted by rcsummers

Upload a picture of the door sticker.....

I'm not accusing you of anything but 245/255 doesn't seem like any OEM combo I've seen before. They'd either be a square setup, or usually a 245 would be paired with a 275 in OEM BMW specs on the f10 and a 225 would be paired with a 255 on the f32 in OEM BMW specs.

I'd be happy to admit I'm wrong though.

The hankooks could have different rolling diameters than the conti's. a 245 hankook isnt always the same exact size as a 245 continental even though they're both 245's.

Sure no problem with that , I have heard that the continental sc7 is slightly larger than other tires but still I know people with my exact same car and have no issue with this tire
Btw my car is a 4 series
My previous 5 series G30 also had 275 on the rear
(Well for some reason doesn't let me attach the door sticker)
I have sent you the vehicle registration document

[pbonsalb]

Originally Posted by rcsummers

Upload a picture of the door sticker.....

I'm not accusing you of anything but 245/255 doesn't seem like any OEM combo I've seen before. They'd either be a square setup, or usually a 245 would be paired with a 275 in OEM BMW specs on the f10 and a 225 would be paired with a 255 on the f32 in OEM BMW specs.

I'd be happy to admit I'm wrong though.

The hankooks could have different rolling diameters than the conti's. a 245 hankook isnt always the same exact size as a 245 continental even though they're both 245's.

AWD cars have to match front and rear tire circumferences within 0-1% though in some cases people seem to have gotten away with 2%. A 10mm stagger works, but sometimes no more. To use a greater stagger you must reduce the aspect ratio of the wider tire to reduce its circumference.

[G30M]

Originally Posted by haru69

Sure no problem with that , I have heard that the continental sc7 is slightly larger than other tires but still I know people with my exact same car and have no issue with this tire
Btw my car is a 4 series

4 series is weird. change to a square setup (all tires exactly the same in evry aspect)

[haru69]

Originally Posted by G30M

4 series is weird. change to a square setup (all tires exactly the same in evry aspect)

Well I will stick to OEM I see no reason to do that

[G30M]

Originally Posted by haru69

Well I will stick to OEM I see no reason to do that

by increasing the front grip it will turn better (and also drift better)

so it depends on the driver preference

[ShocknAwe]

In seriousness what I suspect is that the 245 conti is unusually small and the 255 is unusually large. This is generating more than 1% difference between axles since the sidewall ratio is identical. There are strange differences in sizes seen sometimes. It's not just continental. It seems these measurements are more of a reference point than truth in dimensions. Always best to try to match the circumferences 100% in electrically governed AWD systems.

[haru69]

Originally Posted by G30M

by increasing the front grip it will turn better (and also drift better)

so it depends on the driver preference

The rear slides enough already for me
For my skill that's enough 🤣

[haru69]

Originally Posted by ShocknAwe

In seriousness what I suspect is that the 245 conti is unusually small and the 255 is unusually large. This is generating more than 1% difference between axles since the sidewall ratio is identical. There are strange differences in sizes seen sometimes. It's not just continental. It seems these measurements are more of a reference point than truth in dimensions. Always best to try to match the circumferences 100% in electrically governed AWD systems.

I also heard that after 180kmh the front axle will totally disconnect and you only drive in rwd
Since I also tried already a 50% acceleration from 200kmh and this issue also appears I think there is just some issue with the rear tires
Unless im wrong about the front being disabled after 180kmh

Oh I also forgot to say if I partially turn off DSC or fully off the car has no issues