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Old 02-27-2009, 09:20 AM   #1
mike86325
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Why are OEM CSL wheels so heavy?

I absolutely love the look of CSL rims. But, for some reason BMW made the e46 CSL with carbon fiber everything and no radio and instead of putting lightweight wheels on it, they created these heavy wheels to put on it. Anyone understand why BMW decided to do this? Just doesn't make much sense. (possible complete n00b question, flame suit on).
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Old 02-27-2009, 12:54 PM   #2
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bump, someone must wonder about this too..

Doesn't make sense that BBS, Volk, OZ, etc can all make much lighter rims, yet BMW went with something that weighed a lot since we all know how important rims are as far as unsprung weight.
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Old 02-27-2009, 01:16 PM   #3
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maybe durability?
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Old 02-27-2009, 02:45 PM   #4
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I was thinking this too. Either durability or for the cosmetic appeal of the wheel. But brands like BBS have light, durable, and IMO beautiful rims.


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Originally Posted by iceberq View Post
maybe durability?
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Old 02-27-2009, 08:20 PM   #5
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Are you refering to Replica CSL wheels or the Real CSL wheels?

Also the wheels on the M3 Competition Package are different from the wheels that came with the CSL. They look the same but are different!
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Old 02-27-2009, 08:43 PM   #6
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the OEM CSL wheels.. I wasn't aware that the comp. pkg ones were any different though. But I'm guessing that they are both about the same weight, correct?
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Old 02-27-2009, 08:46 PM   #7
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Who produces BMWs OE wheels?
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Old 02-27-2009, 09:03 PM   #8
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They're incredibly strong. They make excellent track wheels on high-speed courses. May not be ideal for auto-x, but several M3's sport them on ring runs.
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Old 02-27-2009, 09:13 PM   #9
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Wait.

The OEM CSL wheels are made by BBS and are forged.

The OEM ZCP wheels are made by BBS and are spun cast.

What makes you think they are heavy?
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Old 02-28-2009, 04:57 AM   #10
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They are not heavy as you mentioned. I think the 135s are a bit heavy but the other stock wheels are quite light.
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Old 02-28-2009, 02:24 PM   #11
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Since everyone is talking about how heavy or not heavy they are... does anyone know how much they actually weigh?
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Old 02-28-2009, 02:30 PM   #12
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perhaps to lower the center of gravity...helping it stick to the track a little better.
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Old 03-01-2009, 03:00 AM   #13
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perhaps to lower the center of gravity...helping it stick to the track a little better.
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Old 03-01-2009, 03:33 AM   #14
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Quote:
Originally Posted by SpeedDemon View Post
Since everyone is talking about how heavy or not heavy they are... does anyone know how much they actually weigh?
What I've read and which led me to create this thread was that the CSL rims weigh about 26 pounds.. which is not super heavy, but it could be a lot lighter.
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Old 03-01-2009, 03:50 AM   #15
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Quote:
Originally Posted by mike86325 View Post
What I've read and which led me to create this thread was that the CSL rims weigh about 26 pounds.. which is not super heavy, but it could be a lot lighter.
If they do in fact weigh 26lb (I wanna see a source) then that's pretty fricken heavy considering my old 19" wheels with their many, many coats of various paints and finishes weighed 27lb a piece...
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Old 03-01-2009, 04:37 AM   #16
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Why are OEM CSL wheels so heavy? To answer your question, no they are not heavy at all. In fact, they are very very light weight. I don't know where the notion of heavy comes from, and you guys are getting the weight very wrong...

here is more information on OEM wheels available on the M3, may it be self explanatory:

OEM 18 are made by Ronal
Gravity Cast
18x8 et 47 24.7 lbs
18x9 et 26 26.9 lbs

OEM 19 are made by Fuchs
Forged
19x8 et 47 27.8 lbs
19x9.5 et 27 29.2 lbs

OEM CSL/ZCP are made by BBS Germany (not Japan)
Slow Form Cast
19x8 et 47 23.0 lbs
19x9.5 et 27 24.2 lbs

so you can see as to why they made all those light weight parts, they DID make light weight wheels for it.

So the weight of OEM CSL/ZCP are in fact very light, and very strong. Cast vs. Forge are no longer an argument to determine strength because cast technology has improved over the last few years and strength is more dependent on manufacture more than method

also, the OEM CSL/ZCP rims weight the same as 19" BBS LMs

simple fact is that you can only choose 2 of the following in rims: weight/strength/cost

there is no way around it, hopefully this helps some of your questions



edit. also like to add that OEM CSL/ZCP rims are in fact different only in the front rims. The OEM CSL rims are 8.5 in the front while OEM ZCP are 8.0 in the front. The rear rims have the same part number CSL or ZCP
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Old 03-01-2009, 02:19 PM   #17
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Great amount of info are the 8.5 fronts available to the non-csl owner? Seems like the rims could be lighter though but I'm sure price played a role in the design
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Old 03-01-2009, 09:41 PM   #18
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Quote:
Originally Posted by PINHEAD View Post

OEM CSL/ZCP are made by BBS Germany (not Japan)
Slow Form Cast
19x8 et 47 23.0 lbs
19x9.5 et 27 24.2 lbs
I just found this conflicting quote from turner motorsport's store for their OEM BMW m3 CSL wheels..

"These weigh in at only 24LBS each for the front, 25.5 for the rear!"
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Old 03-01-2009, 10:01 PM   #19
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Quote:
Originally Posted by PINHEAD View Post
Why are OEM CSL wheels so heavy? To answer your question, no they are not heavy at all. In fact, they are very very light weight. I don't know where the notion of heavy comes from, and you guys are getting the weight very wrong...

here is more information on OEM wheels available on the M3, may it be self explanatory:

OEM 18 are made by Ronal
Gravity Cast
18x8 et 47 24.7 lbs
18x9 et 26 26.9 lbs

OEM 19 are made by Fuchs
Forged
19x8 et 47 27.8 lbs
19x9.5 et 27 29.2 lbs

OEM CSL/ZCP are made by BBS Germany (not Japan)
Slow Form Cast
19x8 et 47 23.0 lbs
19x9.5 et 27 24.2 lbs

so you can see as to why they made all those light weight parts, they DID make light weight wheels for it.

So the weight of OEM CSL/ZCP are in fact very light, and very strong. Cast vs. Forge are no longer an argument to determine strength because cast technology has improved over the last few years and strength is more dependent on manufacture more than method

also, the OEM CSL/ZCP rims weight the same as 19" BBS LMs

simple fact is that you can only choose 2 of the following in rims: weight/strength/cost

there is no way around it, hopefully this helps some of your questions



edit. also like to add that OEM CSL/ZCP rims are in fact different only in the front rims. The OEM CSL rims are 8.5 in the front while OEM ZCP are 8.0 in the front. The rear rims have the same part number CSL or ZCP

Those arent light weight when you compare them to rims such as BBS RGR. Also the LM is a multi piece wheel.
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Old 03-01-2009, 10:08 PM   #20
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