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Discussion Starter #1
Please help me what size of tyre should I put on 8.5*18 wheels?

e46 sedan

1. front 235/40 | rear 245/35

2. 235/40 front/rear

are those correct sizes?

Thanks in advance!
 

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A 225mm tire is too small for an 8.5" wheel. The wheel will stick out past the tire and that just doesn't look good... You need to go with 235x40's all around or you can put 255x35's on the rear with stock sport suspension and the proper offset (44 to 46).
According to BMW the proper setup is...Front 225x40x18x8
Rear 255x35x18x8.5
 

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It doesn't look bad either. My car had 16x7.5 wheels, when I bought it and 225/50 tires. I don't think it looked bad. For the winter I put 205/55 on 'em and it still doesn't look bad :).

As I found out, you don't need to install 225 to x8 or 255 to x8.5. That's just preferably how you should do it. For example, you can install 225/40 R 18 tires to wheels, which are 18x7.5-18x9, while 18x8 is preferable. It may look not so good at boundary sizes, but you won't notice +/- 0.5.

tirerack.com has such information at the specifications page of tires.

As for me, when spring hits I'll just get 18x8.5 and install 225/40 all-around. I'd better get 18x8, but the wheels I want to get are not available in that size.

I don't think my 328 or your 320d need something bigger than 225 :). 245/255 will be only for looks with no gain in perfomance.

With ****ty roads here I'd better keep unsprung weight at the minimal level.
 

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Laca said:
Please help me what size of tyre should I put on 8.5*18 wheels?

e46 sedan

1. front 235/40 | rear 245/35

2. 235/40 front/rear

are those correct sizes?

Thanks in advance!
go for number 2, trust me becuase I have 225s all around on my 18 x 8.5s and they stick out of the tire making it look wrong and having them exposed to road debris (wheel chipping). I'll say it again but BMW dealers suck and prefer stupid recommendations
 

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Now here is the problem...You can not always depend on wheel and tire dealers to hook you up with the proper wheel and tire combo. I replaced my oem 225x50x16's with 18x8.5 Breyton Inspiration's along with 225x40 tires. And yes, 225's are what BMW recommends...BUT on 8" wheels, not 8.5's... There is nothing to say that you CAN'T put 225's on 8.5" wheels, but the wheel WILL stick out past the tire and that just doesn't look good. Take it from someone who made the mistake...Put 235x 8.5" wheels on the front and 255x35x8.5's on the rear... Just remember.... Once you buy them and drive around on them... They are yours to keep..... Hope this helps....
 
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