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View Poll Results: Zimmerman 2 Piece Rotors... Real or Not?
Legit - Save the money 1 25.00%
1 Piece - Savings but not as advertised 3 75.00%
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      07-19-2019, 12:44 PM   #1
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Cool Zimmerman Two Piece Rotors?

Has anyone bought these and can confirm that these are indeed a two piece design similar to the stock 335i rotors (340mm not 370mm)?

https://www.fcpeuro.com/products/bmw...nn-34106797602



I contacted FCP Euro about them and questioned that the photo for the listing was the exact same photo as for the M Performance rotors that cost 3x as much but the response I received was a typical canned response and didn't build much confidence.

If they actually are as claimed, then I've got to say this would be a no brainer when I replace my rotors, but if, as I suspect, they are a solid 1 piece with zimmerman coatings then I am not so sure.
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      07-19-2019, 01:10 PM   #2
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Hmm, based on this, this could be an incredible find!
https://www.turnermotorsport.com/p-3...m-sport-s2nha/
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      07-19-2019, 01:15 PM   #3
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Those are not two-piece per the Zimmerman website.

http://ows-cdn.tecdoc.net/otto-zimme...22f14a94f205fa

If you go there catalog you can serach for p/n 150.2906.20 and find this info....

General
Article Number
150.2906.20
Article Status
Normal
Packing Unit
1
Quantity per packing unit
2
Criteria
Brake Disc Type
Internally Vented
Machining
High-carbon
Brake Disc Type
Slotted

Drilled dimples
Surface
Coated
Outer diameter
340 mm
Thickness
30 mm
Min. thickness
28,4 mm
Height
73 mm
Hole Pitch / Number
6/5
Bolt Hole Circle 1
120 mm
Hub Bore
79 mm
ABE No.
KBA 61364
Weight
10,9 kg


What you want is part number 150.2906.32

General
Article Number
150.2906.32
Article Status
Normal
Packing Unit
1
Quantity per packing unit
2
Criteria
Brake Disc Type
Internally Vented
Machining
High-carbon
Brake Disc Type
Slotted

Drilled dimples
Surface
Coated
Outer diameter
340 mm
Thickness
30 mm
Min. thickness
28,4 mm
Height
73 mm
Hole Pitch / Number
6/5
Bolt Hole Circle 1
120 mm
Hub Bore
79 mm
Weight
10,9 kg
Supplementary Article/Info 2
Two-piece Brake Disc
Quality
Alu-Topf genietet

Alu hub riveted
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      07-19-2019, 01:39 PM   #4
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Additionally, if you have the M Sport brake (S2NHA) you could get Zimmerman part number 150.2905.32 which is a 2-piece rotor, slotted and dimpled and carried by FCP

https://www.fcpeuro.com/products/bmw...nn-34106797603
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      07-19-2019, 03:28 PM   #5
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i will not recommend buying dimples rotors because of noise

Last edited by pongkin; 07-20-2019 at 07:13 AM..
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      07-19-2019, 11:59 PM   #6
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Quote:
Originally Posted by JaredG_F30 View Post

If you go there catalog you can serach for p/n 150.2906.20 and find this info....

General
Article Number
150.2906.20
.
.
.
Drilled dimples
Surface
Coated
Outer diameter
340 mm
Thickness
30 mm
Min. thickness
28,4 mm
Height
73 mm
Hole Pitch / Number
6/5
Bolt Hole Circle Ø 1
120 mm
Hub Bore Ø
79 mm
ABE No.
KBA 61364
Weight
10,9 kg


What you want is part number 150.2906.32

General
Article Number
150.2906.32
.
.
.
Outer diameter
340 mm
Thickness
30 mm
Min. thickness
28,4 mm
Height
73 mm
Hole Pitch / Number
6/5
Bolt Hole Circle Ø 1
120 mm
Hub Bore Ø
79 mm
Weight
10,9 kg
Supplementary Article/Info 2
Two-piece Brake Disc
Interesting that the weight between the two rotors is identical @ 10.9kg.
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      07-22-2019, 10:45 PM   #7
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Quote:
Originally Posted by pongkin View Post
i will not recommend buying dimples rotors because of noise
BMW dimpled rotors rust inside the dimples. Since Zimmerman's are zinc coated they probably wouldn't rust so they would be better than OEM.
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      07-22-2019, 10:54 PM   #8
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Quote:
Originally Posted by McQueen2014 View Post
Has anyone bought these and can confirm that these are indeed a two piece design similar to the stock 335i rotors (340mm not 370mm)?

https://www.fcpeuro.com/products/bmw-brake-disc-crossed-drilled-and-slotted-zimmermann-34106797602



I contacted FCP Euro about them and questioned that the photo for the listing was the exact same photo as for the M Performance rotors that cost 3x as much but the response I received was a typical canned response and didn't build much confidence.

If they actually are as claimed, then I've got to say this would be a no brainer when I replace my rotors, but if, as I suspect, they are a solid 1 piece with zimmerman coatings then I am not so sure.
Simply being two-piece isn't a big advantage if the two pieces are simply bolted to each other. It matters very little.

True big brake kits such as BremboGT use "floating" two-piece rotors which allows for the different heat characteristics of the two different metals used for the rotor hat and the rotor braking surface.
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      07-23-2019, 11:58 AM   #9
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Quote:
Originally Posted by johnung View Post
BMW dimpled rotors rust inside the dimples. Since Zimmerman's are zinc coated they probably wouldn't rust so they would be better than OEM.
LOL...the BMW rotors are also zinc coated. All these different branded rotors most likely comes from the same manufacturer.

I have both the BMW and Pagid branded simple and slotted rotors. Both are made in Italy and both are physically the same in apperance. Only difference is that the hub (aluminium part) is uncoated on the BMW rotors and coated on on the Pagid.
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      07-23-2019, 05:05 PM   #10
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Quote:
Originally Posted by M4_GTS View Post
Quote:
Originally Posted by johnung View Post
BMW dimpled rotors rust inside the dimples. Since Zimmerman's are zinc coated they probably wouldn't rust so they would be better than OEM.
LOL...the BMW rotors are also zinc coated. All these different branded rotors most likely comes from the same manufacturer.

I have both the BMW and Pagid branded simple and slotted rotors. Both are made in Italy and both are physically the same in apperance. Only difference is that the hub (aluminium part) is uncoated on the BMW rotors and coated on on the Pagid.
A friend of mine has the BMW dimpled rotors and he pointed out to me that they are not zinc coated so he has rust inside all of his dimples. Saw it myself.
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      07-23-2019, 05:33 PM   #11
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Quote:
Originally Posted by johnung View Post
A friend of mine has the BMW dimpled rotors and he pointed out to me that they are not zinc coated so he has rust inside all of his dimples. Saw it myself.
That's wrong, they are zinc coated. Ofcourse theres no coating after use.The brake pads wipe it off completely. My pagid rotors are coated, even the aluminum hub. The dimples still rust out.


Picture of the m performance rotors when new. You can clearly see the rotor is coated (except for the bare aluminium hub)
https://c1552172.ssl.cf0.rackcdn.com/612641_x800.webp
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      07-23-2019, 05:44 PM   #12
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Quote:
Originally Posted by M4_GTS View Post
Quote:
Originally Posted by johnung View Post
A friend of mine has the BMW dimpled rotors and he pointed out to me that they are not zinc coated so he has rust inside all of his dimples. Saw it myself.
That's wrong, they are zinc coated. Ofcourse theres no coating after use.The brake pads wipe it off completely. My pagid rotors are coated, even the aluminum hub. The dimples still rust out.


Picture of the m performance rotors when new. You can clearly see the rotor is coated (except for the bare aluminium hub)
https://c1552172.ssl.cf0.rackcdn.com/612641_x800.webp
I just repeated what he told me about his dimpled rotors not being zinc coated, and what I saw with rust in all of the dimple holes. Brake pads wipe any coating off the rotor surface but how could a flat pad surface possibly wipe the zinc coating out of dimpled holes? Doesn't make sense.
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      07-23-2019, 06:06 PM   #13
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Quote:
Originally Posted by johnung View Post
I just repeated what he told me about his dimpled rotors not being zinc coated, and what I saw with rust in all of the dimple holes. Brake pads wipe any coating off the rotor surface but how could a flat pad surface possibly wipe the zinc coating out of dimpled holes? Doesn't make sense.
The zinc coating only helps to prevent rust. In a lot of cases the rotors will still have rust on it. What you see in the simple holes is most likely dust from the brake pads because they are a metallic pad.
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      07-23-2019, 06:07 PM   #14
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Quote:
Originally Posted by johnung View Post
I just repeated what he told me about his dimpled rotors not being zinc coated, and what I saw with rust in all of the dimple holes. Brake pads wipe any coating off the rotor surface but how could a flat pad surface possibly wipe the zinc coating out of dimpled holes? Doesn't make sense.
Brake pad buildup gets into the dimples. Is he mistaking that for rust? Semi-metallic brake pads have iron in them, so the build up can rust.
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      07-23-2019, 06:10 PM   #15
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Save yourself the guessing and buy the pagid rotors from rockauto. I have them and they are in fact the 2 piece design.
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      07-24-2019, 01:09 PM   #16
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So I sent a bunch more emails back and forth with Kevin at FCPEuro and he advised that the part number "150.2906.32", is the part listed on the site and the Zimmerman reference number on the FCPEuro site is incorrect. So these are the 2 piece rotors despite the confusion.

I am going to risk it and order a set in the next week. I'll post an update with pictures. If they are not as claimed they'll go straight back.
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      07-24-2019, 05:23 PM   #17
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Hey that's good to know. Hopefully they will update their website. I've been in communication with Kyle at FCP to see if they can start carrying the rear versions.

My email to Kyle...

Quote:
Will you guys carry the dimpled version of the rotor linked. The
dimpled version rotor is Zimmerman 150.2904.52, blank version is
p/n150.2904.20 which you carry and is linked.
https://www.fcpeuro.com/products/bmw...nn-34216864899
Quote:
Originally Posted by McQueen2014 View Post
So I sent a bunch more emails back and forth with Kevin at FCPEuro and he advised that the part number "150.2906.32", is the part listed on the site and the Zimmerman reference number on the FCPEuro site is incorrect. So these are the 2 piece rotors despite the confusion.

I am going to risk it and order a set in the next week. I'll post an update with pictures. If they are not as claimed they'll go straight back.
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      07-24-2019, 08:27 PM   #18
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Quote:
Originally Posted by McQueen2014 View Post
So I sent a bunch more emails back and forth with Kevin at FCPEuro and he advised that the part number "150.2906.32", is the part listed on the site and the Zimmerman reference number on the FCPEuro site is incorrect. So these are the 2 piece rotors despite the confusion.

I am going to risk it and order a set in the next week. I'll post an update with pictures. If they are not as claimed they'll go straight back.
why not just order the pagid from rock auto. its the same thing and they ship to Canada taxed prepaid for cheap!
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      07-25-2019, 01:29 PM   #19
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Because you have to pay for the next set from Rock Auto haha. Go FCPEuro for all wear items if at all possible.
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      07-25-2019, 01:36 PM   #20
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Originally Posted by M4_GTS View Post
why not just order the pagid from rock auto. its the same thing and they ship to Canada taxed prepaid for cheap!
I live near enough to the border that the extra shipping costs from Rock Auto to get it to Canada ($180 CDN shipping + guaranteed duties and taxes = ~$250) don't make sense over the free shipping from FCPEuro to my US address. Rock Auto charges $50 to ship to my US address and doesn't carry the other parts I am looking to order at the same time from FCP.
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      07-27-2019, 02:34 AM   #21
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Quote:
Originally Posted by McQueen2014 View Post
I live near enough to the border that the extra shipping costs from Rock Auto to get it to Canada ($180 CDN shipping + guaranteed duties and taxes = ~$250) don't make sense over the free shipping from FCPEuro to my US address. Rock Auto charges $50 to ship to my US address and doesn't carry the other parts I am looking to order at the same time from FCP.
It was cheaper from rockauto shipped to Canada than from fcpeuro shipped to point Roberts for me.
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      07-27-2019, 04:16 PM   #22
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These 370mm and others are only semifloating two piece. All are steel faces with aluminum hats. ECS makes one that saves you about 2lbs in the aluminum hat piece. The dimensions we can fit don't allow for a true floating two piece rotor.
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