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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > Australia > 18" to 19" rims



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      11-01-2013, 08:35 AM   #1
CYL
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18" to 19" rims

Hi, I am going to upgrade my 18" 193 rims to 19" 225 rims, just would like to know after my friend asked me one question.
do I have to adjust the suspension setting after equip with 19"? (I assume BMW would have a different specific clearance for 18" and 19"? I can imagine if the car setup is for 18" when came out from factory, its clearance would be different as to coming out from 19"?)

If the design for E92 is to have a clearance of 10cm
Then when going to 19" from 18", suspension has to be adjusted (1" = 2.55cm) in order to keep the 10cm clearance to adhere to BMW design?
Is it true?
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      11-01-2013, 09:28 AM   #2
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I suspect outer diameter is the same due to different tyre profiles.
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      11-01-2013, 12:29 PM   #3
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I suspect outer diameter is the same due to different tyre profiles.
Oh...it is making sense.
thanks!
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      11-01-2013, 09:17 PM   #4
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I have 20's on mine with no suspension adjustment. Tyre profile is adjusted as you go up in size.
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      11-01-2013, 11:48 PM   #5
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Yeah, the guys above are right re tyre profile, so the total diameter stays the same.

I was thinking about the same upgrade from 18" 193M to 19" 225M, but beware there have been many reports of the 225M wheels cracking - just do a quick search first.
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      11-02-2013, 03:38 AM   #6
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Quote:
Originally Posted by j.w. View Post
Yeah, the guys above are right re tyre profile, so the total diameter stays the same.

I was thinking about the same upgrade from 18" 193M to 19" 225M, but beware there have been many reports of the 225M wheels cracking - just do a quick search first.
Hi, THanks, yeah, i have read a number of threads talking about how prone the 225m to be cracked, but i personally reckon the 225 rims is a lot nicer than the 193?
I am thinking if going from RFT to non RFT would help to minimise the chance to be cracked? people said that it cracks easily due to the RFT technology of the reinforced inner sidewall?
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      11-02-2013, 11:16 AM   #7
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When moving up every inch in wheel size, the car needs to be lowered an equal amount of inches. So say 17" -> 18" means a 1" increase in wheel diameter, you need to drop the car 1". By same logic 17" -> 19" means adjusting the suspension down by 2". In your case you are only going up by 1" so only need to adjust the suspension by 1".
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      11-02-2013, 03:36 PM   #8
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When moving up every inch in wheel size, the car needs to be lowered an equal amount of inches. So say 17" -> 18" means a 1" increase in wheel diameter, you need to drop the car 1". By same logic 17" -> 19" means adjusting the suspension down by 2". In your case you are only going up by 1" so only need to adjust the suspension by 1".
chris had the same problem iirc and his habib bros cut an inch off the stock springs to fix
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      11-02-2013, 06:56 PM   #9
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chris had the same problem iirc and his habib bros cut an inch off the stock springs to fix
Cutting works, but it is a more drastic measure as it can't be undone. You're better off heating and shrinking the springs. At least that way you still retain the same number of coils in the spring while shortening the spring at the same time. If you cut the springs then you do make the car lower, but you also reduce the number of coils in the spring (and cutting can't be un-done - whereas you can reheat and expand the coils again if you want to go back to stock height with the other method.)
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      11-03-2013, 06:43 PM   #10
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Cutting works, but it is a more drastic measure as it can't be undone. You're better off heating and shrinking the springs. At least that way you still retain the same number of coils in the spring while shortening the spring at the same time. If you cut the springs then you do make the car lower, but you also reduce the number of coils in the spring (and cutting can't be un-done - whereas you can reheat and expand the coils again if you want to go back to stock height with the other method.)
i guess with this method you could just drive the car up on some cheap ramps from super cheap and crawl unda the car (with the wheel still on) and wave the oxy back and forth until you get the desired ride height, good thinking suj

I guess that uni edukation is paying off
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      11-04-2013, 04:36 AM   #11
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i guess with this method you could just drive the car up on some cheap ramps from super cheap and crawl unda the car (with the wheel still on) and wave the oxy back and forth until you get the desired ride height, good thinking suj
The irony of this conversation is that my older brother used to have a 253 HT Kingswood... and is a boilermaker..... we were from a country town, and trust me... that is EXACTLY how the boys used to lower their cars!!

The lower you wanted it... the bigger the mates had to be that sat on the guards while the springs were heated
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      11-04-2013, 05:56 PM   #12
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The irony of this conversation is that my older brother used to have a 253 HT Kingswood... and is a boilermaker..... we were from a country town, and trust me... that is EXACTLY how the boys used to lower their cars!!

The lower you wanted it... the bigger the mates had to be that sat on the guards while the springs were heated
you sure your not from punchbowl
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      11-05-2013, 07:46 AM   #13
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See, these methods are effective.
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      11-05-2013, 05:29 PM   #14
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i also heard if ya a little light on the loot then you can stuff some material inside the shocks (you know the bit that overlaps) and its akin to a set of coilovers
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      11-05-2013, 06:04 PM   #15
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Quote:
Originally Posted by QLD View Post
The irony of this conversation is that my older brother used to have a 253 HT Kingswood... and is a boilermaker..... we were from a country town, and trust me... that is EXACTLY how the boys used to lower their cars!!

The lower you wanted it... the bigger the mates had to be that sat on the guards while the springs were heated
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you sure your not from punchbowl
LOL!
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      11-06-2013, 01:00 AM   #16
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It was the late 70's.... place called Barraba

http://www.barraba.com.au/







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Last edited by QLD; 11-06-2013 at 01:26 AM.
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