BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

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      06-24-2018, 08:10 AM   #1
Chris N
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Bilstein B12 difference between conv & coupe

Curious what difference is between the B12 kits for the 128i coupe (46-180537) vs the convertible (46-180520)? Some of the of the various website configuration tools list the 46-180537 for both applications.

Also, is there really a difference between the manufacture dates before or after 9/10? This came up a couple of times as I have been sourcing parts.

Last edited by Chris N; 06-25-2018 at 06:40 AM.
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      06-25-2018, 11:33 AM   #2
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1. Only difference in the kits is the springs.
2. The 2010 date is when BMW changed to different springs, so some manufacturers reference pre- and post-2010 components. Same stuff will fit all e82 or e88 production dates.
3. B12 eye candy... although nobody has in stock :-(

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      06-26-2018, 09:59 AM   #3
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Lmao we are literally wondering the same thing. I figured it's heavier springs to cope with the heavier car.

I ordered the convertible ones by accident and I'm just gonna send it. I think I got some of the last ones TireRack had in stock.
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      06-26-2018, 12:11 PM   #4
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There was a supposed change in the rear springs from progressive to linear 2011. See this thread:
http://www.1addicts.com/forums/showthread.php?t=471267

I have a set of 08 135i rear springs and can't see a differece in coil spacing or thickness that would indicate progressive rates. Maybe it's just too subtle for me to see.
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      06-26-2018, 03:17 PM   #5
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Quote:
Originally Posted by desertman123 View Post
Lmao we are literally wondering the same thing. I figured it's heavier springs to cope with the heavier car.

I ordered the convertible ones by accident and I'm just gonna send it. I think I got some of the last ones TireRack had in stock.
Yeah.... I had my finger on the trigger but wasn't comfortable with not knowing the fitment.
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      07-04-2018, 10:37 PM   #6
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Was a suitable alternative ever discovered?
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      07-06-2018, 08:52 AM   #7
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Quote:
Originally Posted by 128Styll View Post
Was a suitable alternative ever discovered?
I decided to wait. I'm unwilling to take the chance. I will probably just source the parts later.
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