2-Piece Brake Rotors- Anyone Have A Source For Them?

johnung · 04-30-2019, 03:29 PM

Looking for 2-piece brake rotors in 370mm x 30mm and 245mm x 24mm for BMW F30. I know that ECS/ Turner sell really expensive 340mm and 370mm 2-piece rotors for the front only. There are many sources out that there for solid rotors. There must be companies that make/sell 2-piece rotors also. Any information is appreciated. Thanks!
John

UPDATE: Thanks for the responses. To be clear, I am searching for 2-Piece Floating Hat type rotors. I am well aware of the other rotor offerings. It is the floating hat types that I haven't seen in the marketplace for the 370mm front and 345mm rear, other than the 370 front that ECS/Turner Motorsports both sell. I have to believe that there are more manufacturers out there that I have not heard about.

SantaEugence · 04-30-2019, 04:34 PM

From my understanding places that do two piece are about the same price as getting genuine m performance ones so may as well go to the dealer. Or were you after similar priced alternatives?
Otherwise Zimmermann do good one piece aftermarket in a variety of finishes (drilled/slotted/combination) or here in the UK MTEC do them as well both can be had for about £150 a pair for 370mm fronts and slightly less for rears.
I’m told unless you’re tracking it or otherwise a fanatic you’re unlikely to notice the different of not having the lighter bell but I stand to be corrected.

Tchao · 04-30-2019, 04:41 PM

RockAuto has 2 piece Aluminium hat rotors for 370mm for ~ $130 ea

Both blank and slotted/dimpled.

https://www.rockauto.com/en/parts/pa...831,rotor,1896

FaRKle! · 04-30-2019, 07:23 PM

Quote:

Originally Posted by johnung

Looking for 2-piece brake rotors in 370mm x 30mm and 245mm x 24mm for BMW F30. I know that ECS/ Turner sell really expensive 340mm and 370mm 2-piece rotors for the front only. There are many sources out that there for solid rotors. There must be companies that make/sell 2-piece rotors also. Any information is appreciated. Thanks!
John

The OE M-sport (blue brakes) and M-Perf rotors are two piece front and rear. They have an Al hat connected to the iron rotor with rivets. As the above posters have linked, you can get OEM versions for much less (I personally use the Pagid ones for the rear).

If you're talking about two piece in the sense of those styled similar to BBKs that are semi/floating, then ECS and Stoptech Aerorotors are the only options I know of unless you want to do something custom like Adam's Rotors.

FWIW, the Aerorotors have more wear thickness than OE (2mm vs 1.6mm), but the friction ring replacements are like $335 a piece...

johnung · 04-30-2019, 08:38 PM

Quote:

Originally Posted by FaRKle!

Quote:

Originally Posted by johnung

Looking for 2-piece brake rotors in 370mm x 30mm and 245mm x 24mm for BMW F30. I know that ECS/ Turner sell really expensive 340mm and 370mm 2-piece rotors for the front only. There are many sources out that there for solid rotors. There must be companies that make/sell 2-piece rotors also. Any information is appreciated. Thanks!
John

The OE M-sport (blue brakes) and M-Perf rotors are two piece front and rear. They have an Al hat connected to the iron rotor with rivets. As the above posters have linked, you can get OEM versions for much less (I personally use the Pagid ones for the rear).

If you're talking about two piece in the sense of those styled similar to BBKs that are semi/floating, then ECS and Stoptech Aerorotors are the only options I know of unless you want to do something custom like Adam's Rotors.

FWIW, the Aerorotors have more wear thickness than OE (2mm vs 1.6mm), but the friction ring replacements are like $335 a piece...

Thanks! I haven't seen the StopTech and pajid offerings. Where did you get yours? I looked at Adam's last week and am pretty sure they only do solid rotors.

Polo08816 · 04-30-2019, 09:31 PM

Quote:

Originally Posted by johnung

Looking for 2-piece brake rotors in 370mm x 30mm and 245mm x 24mm for BMW F30. I know that ECS/ Turner sell really expensive 340mm and 370mm 2-piece rotors for the front only. There are many sources out that there for solid rotors. There must be companies that make/sell 2-piece rotors also. Any information is appreciated. Thanks!
John

Just get Zimmerman rotors from FCP Euro.

Vulpe · 04-30-2019, 10:29 PM

R1 Concepts started offering 2-piece 370mm rotors but no 345mm for the rears.

When I upgraded my brakes I ordered through buycarparts.co.uk. Took a chance as it seemed a little sketchy but I got Brembo dimpled/slotted 370/345 2-piece rotors shipped for under $600.

Tchao · 05-01-2019, 05:36 PM

Quote:

Originally Posted by johnung

Thanks! I haven't seen the StopTech and pajid offerings. Where did you get yours? I looked at Adam's last week and am pretty sure they only do solid rotors.

The ones I linked are Pagids.

Logicoeur · 05-04-2019, 07:20 AM

The dimensions and offset don't make it possible to have a true floating 2piece rotor. There's a thread somwhere here where the dimensions are measured and sent to a rotor supplier overseas. Pretty detailed.

RbBugBitMe · 05-04-2019, 07:42 AM

Quote:

Originally Posted by Logicoeur

The dimensions and offset don't make it possible to have a true floating 2piece rotor. There's a thread somwhere here where the dimensions are measured and sent to a rotor supplier overseas. Pretty detailed.

Have a link or what to search for? I'm not finding anything and would like to read it.

johnung · 05-04-2019, 09:32 AM

Quote:

Originally Posted by Logicoeur

The dimensions and offset don't make it possible to have a true floating 2piece rotor. There's a thread somwhere here where the dimensions are measured and sent to a rotor supplier overseas. Pretty detailed.

That doesn't make sense to me only because Brembo makes them to fit the F30 in their Brembo GT brake kits, just not in a 370x30 size.

Logicoeur · 05-04-2019, 10:15 AM

Quote:

Originally Posted by johnung

Quote:

Originally Posted by Logicoeur

The dimensions and offset don't make it possible to have a true floating 2piece rotor. There's a thread somwhere here where the dimensions are measured and sent to a rotor supplier overseas. Pretty detailed.

That doesn't make sense to me only because Brembo makes them to fit the F30 in their Brembo GT brake kits, just not in a 370x30 size.

Thats why I pointed out the offset. Those GT brakes are not offset to 30mm, eg 345x28mm or something like that. We'd need a mounting adapter to use our OE calipers with a true floating rotor.

Logicoeur · 05-04-2019, 10:21 AM

Quote:

Originally Posted by RbBugBitMe

Quote:

Originally Posted by Logicoeur

The dimensions and offset don't make it possible to have a true floating 2piece rotor. There's a thread somwhere here where the dimensions are measured and sent to a rotor supplier overseas. Pretty detailed.

Have a link or what to search for? I'm not finding anything and would like to read it.

https://f30.bimmerpost.com/forums/sh....php?t=1410210

Just searched for 370mm 2 piece rotor

tryingtobebest · 07-23-2019, 01:53 PM

Im very interested in any news about F30 FLOATING front rotors...
The only other company that ive found is Stoptech - Stoptech Aero Rotors and Rotor Kits F3X 335i 435i

Anyone else found anything?

johnung · 07-23-2019, 04:26 PM

Quote:

Originally Posted by tryingtobebest

Im very interested in any news about F30 FLOATING front rotors...
The only other company that ive found is Stoptech - Stoptech Aero Rotors and Rotor Kits F3X 335i 435i

Anyone else found anything?

I did a lot of research myself. Those StopTech aero rotors are the only true floating two-piece rotors in the M Performance front rotor size of 370mm x 30mm (so that they can be used with M Performance Brembo 4-piston Front calipers.)

Brembo provides very similar floating two-piece rotors in their BremboGT big brake kits. But those big brake kit rotors come in various sizes but they are all about 4mm thicker than BMW rotors so none of those can be used with M Performance calipers.

For instance, M Performance Brembo 2-piston rear calipers use rotors that are 345mm x 24mm thick. There is a BremboGT 4-piston rear caliper that uses a 345mm rotor, but it is 4mm thicker at 28mm.

The BremboGT brake kits are extremely expensive and would cost about $8,000 to do all four corners.

04-30-2019, 03:29 PM	#1
johnung Major General 4553 Rep 5,413 Posts Drives: 2015 BMW 335i x-Drive Auto Join Date: Oct 2017 Location: New Jersey/Philadelphia iTrader: (1) Garage List 2015 BMW 335i XDriv ... [8.67]	2-Piece Brake Rotors- Anyone Have A Source For Them? Looking for 2-piece brake rotors in 370mm x 30mm and 245mm x 24mm for BMW F30. I know that ECS/ Turner sell really expensive 340mm and 370mm 2-piece rotors for the front only. There are many sources out that there for solid rotors. There must be companies that make/sell 2-piece rotors also. Any information is appreciated. Thanks! John UPDATE: Thanks for the responses. To be clear, I am searching for 2-Piece Floating Hat type rotors. I am well aware of the other rotor offerings. It is the floating hat types that I haven't seen in the marketplace for the 370mm front and 345mm rear, other than the 370 front that ECS/Turner Motorsports both sell. I have to believe that there are more manufacturers out there that I have not heard about. Last edited by johnung; 04-30-2019 at 11:40 PM.. Reason: clarity
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04-30-2019, 04:34 PM	#2
SantaEugence Major 479 Rep 1,325 Posts Drives: F30 330d xDrive Auto Join Date: Mar 2019 Location: UK iTrader: (0)	From my understanding places that do two piece are about the same price as getting genuine m performance ones so may as well go to the dealer. Or were you after similar priced alternatives? Otherwise Zimmermann do good one piece aftermarket in a variety of finishes (drilled/slotted/combination) or here in the UK MTEC do them as well both can be had for about £150 a pair for 370mm fronts and slightly less for rears. I’m told unless you’re tracking it or otherwise a fanatic you’re unlikely to notice the different of not having the lighter bell but I stand to be corrected.
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04-30-2019, 04:41 PM	#3
Tchao Boost Addict 344 Rep 349 Posts Drives: E30, E82, F30, F87 Join Date: Feb 2015 Location: Charleston iTrader: (0)	RockAuto has 2 piece Aluminium hat rotors for 370mm for ~ $130 ea Both blank and slotted/dimpled. https://www.rockauto.com/en/parts/pa...831,rotor,1896 __________________ S55 M2C \| Three Pedal Club \| E30TU Last edited by Tchao; 04-30-2019 at 04:49 PM..
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04-30-2019, 10:29 PM	#7
Vulpe Lieutenant 312 Rep 402 Posts Drives: F87 M2C Join Date: Aug 2017 Location: Hawaii iTrader: (0) Garage List 2020 BMW M2 Competi ... [10.00]	R1 Concepts started offering 2-piece 370mm rotors but no 345mm for the rears. When I upgraded my brakes I ordered through buycarparts.co.uk. Took a chance as it seemed a little sketchy but I got Brembo dimpled/slotted 370/345 2-piece rotors shipped for under $600. __________________ Past: 2011 Acqua Minerale Blue Hyundai Genesis Coupe 3.8 Past: 2017 Alpine White 440i F32 Current: 2020 Long Beach Blue M2 Competition PC Build: 5950x/6900xt
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05-04-2019, 07:20 AM	#9
Logicoeur Lieutenant Colonel 994 Rep 1,934 Posts Drives: F30 335i xDrive Join Date: Feb 2018 Location: Boston iTrader: (0)	The dimensions and offset don't make it possible to have a true floating 2piece rotor. There's a thread somwhere here where the dimensions are measured and sent to a rotor supplier overseas. Pretty detailed. __________________ F30 335iX \| Remus Axleback \| Fabspeed Catted DP \| VRSF Comp IC \| 18X9 ET35 19lb MT1 \| 255/40/18 ECS \| Ohlins RT Millway Street \| Millway Control Arm Bushings \| Turner Endlinks \| TMH 75mm 14x1.5 Studs \| BMW MPerf LSD \| XDelete \| Pipercross Filter \| MHD Stg2 93
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07-23-2019, 01:53 PM	#14
tryingtobebest First Lieutenant 92 Rep 370 Posts Drives: E90 Join Date: Oct 2012 Location: Calgary, Ab iTrader: (3)	Im very interested in any news about F30 FLOATING front rotors... The only other company that ive found is Stoptech - Stoptech Aero Rotors and Rotor Kits F3X 335i 435i Anyone else found anything? __________________ TTBB Build Thread, 335D Review - UPDATED Sep 2019 TTBB E90 with 19" VMR V703 (VB3) and aggressive fitment
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