Difference between standard CSL alloys and Magnesium Cup alloys

**danr55** · 12-05-2009, 01:17 PM

Hi Guys, another stupid question

What's the difference? Guessing the Magnesium Cup wheels are a fair bit lighter, and therefore handling is improved.

Much difference in the real world?

**shimmy** · 12-05-2009, 01:34 PM

yes much much lighter BUT the magnessium ones are a problem when wet, as they tend to fizz around the street and let off steam before disappearing

Bealo · 13-05-2009, 02:34 AM

Quote:

Originally Posted by shimmy

yes much much lighter BUT the magnessium ones are a problem when wet, as they tend to fizz around the street and let off steam before disappearing

you crack me up Shimmy...

NZ_M3 · 13-05-2009, 11:13 AM

Correct .. same part numbers for the rears for CSL and CS

CSL fronts are 0.5 inch wider compared to the CS, but exactly the same manufacturing process - flow casting.

Nothing special about the CSL wheels to be honest - it's not even forged or semi solid forged and definitely not magnesium (probably why it is so cheap to buy ... )

danp · 12-05-2009, 01:35 PM

Quote:

Originally Posted by danr55

Hi Guys, another stupid question

What's the difference? Guessing the Magnesium Cup wheels are a fair bit lighter, and therefore handling is improved.

Much difference in the real world?

I believe that "magnesium cup wheels" are a figment of someones imagination, there is no such thing. (but this myth was somehow perpetuated, and people often mention them in ads etc)

CSL/cup wheels are lighter than normal wheels, but not magnesium.

**DazBlackCSL** · 12-05-2009, 01:47 PM

Cup = what tyres are on it only

Shimmy

**danr55** · 12-05-2009, 03:01 PM

there's only one type of csl wheel? And presumably they are all magnesium?!

JordanH · 12-05-2009, 03:05 PM

Quote:

Originally Posted by danr55

there's only one type of csl wheel? And presumably they are all magnesium?!

No, I read the above as none of them are magnesium.

E46ACS · 12-05-2009, 03:29 PM

There are the "CSL" wheels, which are nice and light.

And there are the "CS" wheels (from the M3 CS) which are the same design but weigh about the same as the M3 OEM 19" wheels.

The CSL wheels are made from a lighter alloy, I believe the 'magnesuim' is a bit of a myth.

The CSL wheels are much lighter though, when I swapped my OEM 19" on my M3 for CSL wheels, I couldn't believe how much of a difference there was between them.

I think the term "cup wheels" just comes from the fact that the CSL came with the Cup tyres as standard, but you could spec M3 OEM 19" with PS2's as an option.

12-05-2009, 01:17 PM	#1
danr55 S5 - Full Throttle Join Date: May 2009 Posts: 262 Casino cash: $604	Difference between standard CSL alloys and Magnesium Cup alloys Hi Guys, another stupid question What's the difference? Guessing the Magnesium Cup wheels are a fair bit lighter, and therefore handling is improved. Much difference in the real world?

12-05-2009, 01:47 PM	#6
DazBlackCSL CSL Register Uber-poster! Join Date: Apr 2008 Location: Shaboogling Posts: 7,199 Casino cash: $28478	Cup = what tyres are on it only Shimmy __________________ CSL Register Lifestyle Coach and Social Secretary

12-05-2009, 03:29 PM	#9
E46ACS S5, Sport Off, DSC M-track Join Date: Oct 2008 Location: Durham Posts: 771 Casino cash: $1950	There are the "CSL" wheels, which are nice and light. And there are the "CS" wheels (from the M3 CS) which are the same design but weigh about the same as the M3 OEM 19" wheels. The CSL wheels are made from a lighter alloy, I believe the 'magnesuim' is a bit of a myth. The CSL wheels are much lighter though, when I swapped my OEM 19" on my M3 for CSL wheels, I couldn't believe how much of a difference there was between them. I think the term "cup wheels" just comes from the fact that the CSL came with the Cup tyres as standard, but you could spec M3 OEM 19" with PS2's as an option. __________________ "Brake.....brake......SUPER BRAKE!!!"

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12-05-2009, 01:34 PM	#2
shimmy CSL Register Uber-poster! Join Date: Apr 2008 Location: Uk Posts: 14,646 Casino cash: $43909	yes much much lighter BUT the magnessium ones are a problem when wet, as they tend to fizz around the street and let off steam before disappearing

13-05-2009, 11:13 AM	#4
NZ_M3 S5, Sport On, DSC M-track Join Date: Jun 2008 Location: Auckland, New Zealand Posts: 1,434 Casino cash: $13579	Correct .. same part numbers for the rears for CSL and CS CSL fronts are 0.5 inch wider compared to the CS, but exactly the same manufacturing process - flow casting. Nothing special about the CSL wheels to be honest - it's not even forged or semi solid forged and definitely not magnesium (probably why it is so cheap to buy ... )

12-05-2009, 03:01 PM	#7
danr55 S5 - Full Throttle Join Date: May 2009 Posts: 262 Casino cash: $604	there's only one type of csl wheel? And presumably they are all magnesium?!