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Off kilter but can anyone explain why some cars such as my i4 35 sport have different wheel sizes - 245/45/18 F 255/45/18 Rear whilst other cars of same model have same size front and rear?
That doesn't make sense to me? Unless it is a Sport set up, but with 18"? My 2023 i4e35 has squared set up, all four the same size (18") so I can rotate and do. My 2022 i4e40 has off set, 19" but rears are the wider tire than the fronts, for a more sporty handling. I believe rims are different sizes to accomodate the offset sizes.
 
That doesn't make sense to me? Unless it is a Sport set up, but with 18"? My 2023 i4e35 has squared set up, all four the same size (18") so I can rotate and do. My 2022 i4e40 has off set, 19" but rears are the wider tire than the fronts, for a more sporty handling. I believe rims are different sizes to accomodate the offset sizes.
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Agreed - attached pdf of OEM tyres with mine highlighted.
 

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Off kilter but can anyone explain why some cars such as my i4 35 sport have different wheel sizes - 245/45/18 F 255/45/18 Rear whilst other cars of same model have same size front and rear?
This is a reply to the original question by pvihreid. My i4 also has different front and rear tyre sizes, exactly the same sizes as yours. I have no idea why the tyre sizes are not the same front and rear, but the differences as shown below, while driving straight, are probably less than you would get when cornering with identical front and rear tyres. However the sharper you turn with either setup, the further the front tyres travel relative to the rear tyres, and that exacerbates the the differnce difference between front and rear. Weird that BMW has this different front/rear tyre sizes.

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Agree but still wondering why the same car coming off the same production line might have, apparently randomly, same or staggered tyres. Seems nonsensical and its not as though it was an option.
MSport package?
 
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Agree but still wondering why the same car coming off the same production line might have, apparently randomly, same or staggered tyres. Seems nonsensical and its not as though it was an option.
I must agree that having i4s with 4 tyres all the same and others with 2 different size tyres front and rear (and even on the same spec cars e.g i4M50) seem strange and certainly not according to some logical process. In the past I have had several Mercedes Benz AMG models where the rear tyres were larger than the front tyres, but this was consistent for all cars of that particular model.
 
Wait until people find out that these cars come with 4 or 5 different wheel sizes (20, 19, 18, etc) and like 4 or 5 tire brands, (Pirelli, Hankook, Michelin, etc) even on cars with the same size wheels.

On the production line, they can go like 15-20 cars in a row and every one have a different wheel setup.

It's almost as if BMW manufactures bespoke cars! 😮
 
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Wait until people find out that these cars come with 4 or 5 different wheel sizes (20, 19, 18, etc) and like 4 or 5 tire brands, (Pirelli, Hankook, Michelin, etc) even on cars with the same size wheels.

On the production line, they can go like 15-20 cars in a row and every one have a different wheel setup.

It's almost as if BMW manufactures bespoke cars! 😮
I have never understood why cars are made with such large rims and then, by definition, have lower profile tyres fitted. I don't know about where the rest of you live, but in all of Africa, the smallest rims means the highest profile tyres and the lowest risk of writing off a tyre, and sometimes the rim as well, driving through a pothole.
 
I have never understood why cars are made with such large rims and then, by definition, have lower profile tyres fitted. I don't know about where the rest of you live, but in all of Africa, the smallest rims means the highest profile tyres and the lowest risk of writing off a tyre, and sometimes the rim as well, driving through a pothole.
Oh, and another thing. Why sell cars with no spare wheel (or jack and wheel spanner etc), but still don't fit run-flats as standard. Makes me wonder what the designers level of understanding of the real world is?
 
I have never understood why cars are made with such large rims and then, by definition, have lower profile tyres fitted. I don't know about where the rest of you live, but in all of Africa, the smallest rims means the highest profile tyres and the lowest risk of writing off a tyre, and sometimes the rim as well, driving through a pothole.
Some people (not me) think that they look good.
 
The tire sizes for each of the different packages and option combinations is all spelled out in the order guide. I knew exactly what size tires my car would have. It isn't like some one at the BMW factory is just grabbing whatever tires happen to be handy from a big pile.
 
The tire sizes for each of the different packages and option combinations is all spelled out in the order guide. I knew exactly what size tires my car would have. It isn't like some one at the BMW factory is just grabbing whatever tires happen to handy from a big pile.
With at least 4 or 5 different tire brands on our cars, it kind of seems like they do. Otherwise, why would one car get Pirellis and another with a near identical spec gets Michelins? If everyone with an M50 got one brand and everyone with an X40 got another, it would seem less haphazard.
 
With at least 4 or 5 different tire brands on our cars, it kind of seems like they do. Otherwise, why would one car get Pirellis and another with a near identical spec gets Michelins? If everyone with an M50 got one brand and everyone with an X40 got another, it would seem less haphazard.
Brand yes, I'm guessing this has more to do with supply chain. But I was responding to the assertion that some cars get a square setup while others get a staggered one. That isn't something left to chance. The choices made on the option sheet determines the tire size with certainty unless a mistake was made, which is certainly not impossible.
 
It also doesn't hurt that even some ostensibly square setups aren't. The set of rims I bought from someone's OEM spec are listed on the spec sheet as 18's all around, but the backs are 18.5.
 
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It also doesn't hurt that even some ostensibly square setups aren't. The set of rims I bought from someone's OEM spec are listed on the spec sheet as 18's all around, but the backs are 18.5.
So what tyres do you fit on these 18.5 inch wheels. I can find no reference to 18.5 inch tyres on the internet.
 
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