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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > Check my maths please.



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      01-23-2015, 10:53 PM   #1
TripleBlack
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Check my maths please.

So I am now on 4th crack 225M wheel and I am looking to go aftermarket now.

I'm thinking 20" for the sake of style and an additional reminder to slow down.

I believe my current standard set up is as follows:

Front: 19x8 ET37 with 225/35 R19 tyres
Rear: 19x9 ET39 with 255/30 R19 tyres

The wheels I am looking at are:
Front: 20x9 ET35
Rear: 20x10.5 ET38

I am guessing my tyres should be:
Front: 250/30 (or 25) R20
Rear: 275/30 (or 25) R20.

Other than considering 20 inch wheels, am I doing anything wrong?

Will it fit offeres up a diagram for this:
http://www.willtheyfit.com/index.php...et2=38#content
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      01-24-2015, 12:57 AM   #2
IanS100
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I've no idea whether these will physically fit without fouling anything but the 25 profile is closer to your existing setup as far as rolling radius goes & won't lift you up on stilts
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      01-24-2015, 03:12 AM   #3
TripleBlack
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Quote:
Originally Posted by IanS100 View Post
I've no idea whether these will physically fit without fouling anything but the 25 profile is closer to your existing setup as far as rolling radius goes & won't lift you up on stilts
According to the site,:-
Compared to your existing wheel, this new wheel will have an inner rim which is 18.1mm closer to the suspension strut. The outer rim will poke out 20.1mm more than before.

The rim does look quite close in the diagram
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      01-24-2015, 03:31 AM   #4
makkan00
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Quote:
Originally Posted by TripleBlack View Post
So I am now on 4th crack 225M wheel and I am looking to go aftermarket now.

I'm thinking 20" for the sake of style and an additional reminder to slow down.

I believe my current standard set up is as follows:

Front: 19x8 ET37 with 225/35 R19 tyres
Rear: 19x9 ET39 with 255/30 R19 tyres

The wheels I am looking at are:
Front: 20x9 ET35
Rear: 20x10.5 ET38

I am guessing my tyres should be:
Front: 250/30 (or 25) R20
Rear: 275/30 (or 25) R20.

Other than considering 20 inch wheels, am I doing anything wrong?

Will it fit offeres up a diagram for this:
http://www.willtheyfit.com/index.php...et2=38#content
New wheels will fit easily with following rubber
235/35/20
265/30/20


If you go for wider rubber, you may get a bit of rubbing. It depends on if you are on standard suspension or aftermarket suspension / dropped car.
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      01-25-2015, 09:08 PM   #5
TripleBlack
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Well I am on standard Msport suspension so I don't know what that would mean but after much deliberation across the weekend, I have just ordered some 20" rims and I'll be looking to get tyres sizes recommended by Makkan. I'll post a pic once its set up.
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