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.

 

maybe durability?

 

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.

 

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!

 

Myth. They are the same part number for rears. The ZCP front wheel is -0.5" from the CSL so it has a different PN but its essentially the same.

I revived this thread from the dead.

 

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?

 

Who produces BMWs OE wheels?

 

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.

 

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?

 

They are not heavy as you mentioned. I think the 135s are a bit heavy but the other stock wheels are quite light.

 

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.

 

perhaps to lower the center of gravity...helping it stick to the track a little better.

 

l
o
l

 

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

 

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!"

 

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

 

Lol

 

OEM CSL ($1900)

19x8 Front: 24lbs
19x9.5 Rear: 25.5lbs

VMR wheels ($900)

19x8.5 Front: 25lbs
19x9.5 Rear: 25.5lbs

Almost identical weights with very different prices.. and as the other guy said, the RGR's are way lighter than the CSL rims. I'm just not extremely impressed with the OEM rims. For the price and the fact that it was made for the CSL, it shouldve been a lot lighter.

 

Almost identical weights with very different prices.. and as the other guy said, the RGR's are way lighter than the CSL rims. I'm just not extremely impressed with the OEM rims. For the price and the fact that it was made for the CSL, it shouldve been a lot lighter.

Aluminum is going to be the same weight no matter if it is in an OEM or aftermarket wheel. You can go with a forged wheel which is a little stronger than LP cast so they get to use less material for similar strength. In either case, wheel shopping is not as easy as picking the one you like, especially if you have weight constraints on your mind. For us, our goal is to be comparable in weight with factory wheels so that the driveability of the car remains pretty much the same.

And please don't compare oem ZCP rims to VMR replicas, ZCP are made by BBS while VMR are made in China.

Note to self: If I made all the wheels in China, I can sell them for half the price.

 

The RGR is a damn impressive wheel when you consider that an 18x9 weighs 19lbs and it looks great too.

 

You keep forgetting, you are talking about OEM wheels. Where have you seen other OEM wheels that are this light? Have you seen the weight of some of the rims for Ferrari or Lamborghini? For a car like the 360CS, you know Ferrari chooses to use BBS CH, which weight more than the ZCP rims and are made the same way?

19 lbs for RGR's are very impressive, but those are not the only light weight wheel options when you start to venture into the aftermarket category, even LMs.
Volk TE/LE are also 19lbs front and back even with 10.5, Volk CE's are even lighter at 18lbs front and 19lbs rear. Many other rims such as Enkei RPF1 and OZ Ultraleggera's are also under 20lbs and cost a fraction of what RGR's cost.
As for the OEM ZCP rims's weight I assure you its accurate because I've also seen it on the scale myself and have confirmed with many others on M3Forum the weight of OEM wheels.
You are asking way too much to make a rim so light without looking at cost and strength. And please don't compare oem ZCP rims to VMR replicas, ZCP are made by BBS while VMR are made in China.
You are demanding far too much from OEM. Like I said, you can only choose 2 out of the 3 with quality, cost, and weight.
There is no way around it, factory or aftermarket.

 

I totally understand where you're coming from. Expecting 20lb OEM 19in rims is a little much. I'm buying an m3 soon and I really love the CSL look on these cars but when I saw how it only was a few pounds lighter than the 18in weight I thought I'd see whats up (thus this thread). I guess I was sort of expecting something comparable to the RGRs because I knew BBS made them.

 

mmmmm....RE-Mg's :drool:

someone post pics :eeps:

 

so clean :drool:

 

RGR's are not BBK friendly but they are light weight
RS-GTs are BBK friendly but they weight just as much as LMs
give and take

 

Why?