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      09-25-2018, 07:18 AM   #1
kern417
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Slotted Rotors for 370/345 Brakes

Has anyone found rotors for the MSport/MPerformance brakes that are only slotted? No drilling or dimples. If not I'll just go with the regular blanks, but hoping someone's searching skills are better than mine because I can't find anything. Bonus points if they are 2 piece and don't cost $1k
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      09-25-2018, 07:31 AM   #2
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I got mine from R1 concepts. Been using them for 4 set of rotors on my bimmers.
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      09-25-2018, 08:20 AM   #3
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Quote:
Originally Posted by alexng72 View Post
I got mine from R1 concepts. Been using them for 4 set of rotors on my bimmers.
Thanks man, I remembered seeing yours were slotted and dimpled but now I see they sell just slotted too. And the price isn't too crazy
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      09-25-2018, 08:22 AM   #4
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Quote:
Originally Posted by kern417 View Post
Has anyone found rotors for the MSport/MPerformance brakes that are only slotted? No drilling or dimples. If not I'll just go with the regular blanks, but hoping someone's searching skills are better than mine because I can't find anything. Bonus points if they are 2 piece and don't cost $1k
I believe Zimmerman (OEM) rotors from FCP Euro are two piece are like half the price as the original M Sport rotors.
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      09-25-2018, 10:47 AM   #5
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Stoptech AeroRotors have a slotted only option. Not worth it unless you track though.

If you do track, I'd look for a two-piece rotor over a one-piece.
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      09-25-2018, 01:49 PM   #6
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My priority is 2 piece like stock, then slotted if I can find them. I have a stock tune with light wheels/tires and don't want to add weight back on with cast rotors.

I will never track the car but my stock blanks already have some grooves with less than 6k on them due to things getting stuck in between the pad and rotor. I like having a rotor that is "self-servicing" and always has a clean surface. But I'm not willing to pay $500+ just for a set of rotors. At that price point i'll just OEM style blanks like Polo08816 recommended.
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      09-27-2018, 08:13 AM   #7
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like said above, Stoptech has an option for slotted only option. I have that on my car and got them through Rockauto. Cheap and quick shipping.
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      09-27-2018, 08:52 AM   #8
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Thanks but those are 1-piece cast. Their 2-piece rotors are like $700 for just fronts.
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      09-27-2018, 09:32 AM   #9
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Ahh okay gotcha. Sorry about that.
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      09-27-2018, 10:20 AM   #10
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Quote:
Originally Posted by alexng72 View Post
I got mine from R1 concepts. Been using them for 4 set of rotors on my bimmers.
Dimpled & slotted front & rear for $450?
very nice
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      09-27-2018, 11:33 PM   #11
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Quote:
Originally Posted by insanecoder View Post
Quote:
Originally Posted by alexng72 View Post
I got mine from R1 concepts. Been using them for 4 set of rotors on my bimmers.
Dimpled & slotted front & rear for $450?
very nice
Yea man they look very nice too
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      01-03-2019, 11:52 AM   #12
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Quote:
Originally Posted by alexng72 View Post
I got mine from R1 concepts. Been using them for 4 set of rotors on my bimmers.
how are you liking your rotors so far?

i've heard mix reviews from really good to people complaining about squeaking.
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      01-03-2019, 09:55 PM   #13
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Aren't the oem 2 piece still entirely Cast? Where do you save the weight with them being 2piece?
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      01-04-2019, 01:05 AM   #14
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Quote:
Originally Posted by Logicoeur View Post
Aren't the oem 2 piece still entirely Cast? Where do you save the weight with them being 2piece?
OE rotors have an Al hat which is connected to the iron rotor via large rivets. The hat isn't cast.
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      01-04-2019, 01:43 AM   #15
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With a 2 piece rotor, the hat will attach to the disk with a few bolts around the outside of the hat. It's also possible for material between the bolt holes to be removed making them a little lighter.

Here are some of rotor weights I found showing the difference:

Front 370x30
BMW OE solid 2-piece rotor - 36.4 lbs
BMW OE slotted and dimpled 2-piece rotor - 26.2 lbs
Zimmerman slotted and dimpled 1-piece rotor - 29.2 lbs

Rear 345x24
BMW OE solid 2-piece rotor - 19.8 lbs
BMW OE slotted and dimpled 2-piece rotor - 18.8 lbs
Pilenga solid 2-piece rotor - 20.4 lbs
Pilenga slotted and dimpled 2-piece rotor - 19.2 lbs
Zimmerman solid 1-piece rotor - 21.0 lbs

Given the big weight difference between the BMW 370x30 solid 2-piece rotor and the BMW 2-piece slotted and dimpled rotor, it would seem to confirm that the hat of the slotted and dimpled rotor was aluminum, but that doesn't seem to be the case with the regular solid 2-piece rotor.

Honestly though, the difference between comparable 1-piece rotors and 2-piece rotors is only 3 lbs on the front brakes and a little over 1 lb on the rears. Unless you're flat out racing with the car it's unlikely you'd feel any difference in ride compliance, handling or braking distance.
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      01-04-2019, 09:03 AM   #16
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I just did lightweight wheels, summer tires, etc. and with stock tune the car feels much more responsive and peppy. I don't want to go backwards on that progress. I'm sure it won't make a huge difference, but if I'm upgrading then I'm going to do it right.
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      01-04-2019, 11:11 AM   #17
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Quote:
Originally Posted by E30M CW View Post
With a 2 piece rotor, the hat will attach to the disk with a few bolts around the outside of the hat. It's also possible for material between the bolt holes to be removed making them a little lighter.

Here are some of rotor weights I found showing the difference:

Front 370x30
BMW OE solid 2-piece rotor - 36.4 lbs
BMW OE slotted and dimpled 2-piece rotor - 26.2 lbs
Zimmerman slotted and dimpled 1-piece rotor - 29.2 lbs

Rear 345x24
BMW OE solid 2-piece rotor - 19.8 lbs
BMW OE slotted and dimpled 2-piece rotor - 18.8 lbs
Pilenga solid 2-piece rotor - 20.4 lbs
Pilenga slotted and dimpled 2-piece rotor - 19.2 lbs
Zimmerman solid 1-piece rotor - 21.0 lbs

Given the big weight difference between the BMW 370x30 solid 2-piece rotor and the BMW 2-piece slotted and dimpled rotor, it would seem to confirm that the hat of the slotted and dimpled rotor was aluminum, but that doesn't seem to be the case with the regular solid 2-piece rotor.

Honestly though, the difference between comparable 1-piece rotors and 2-piece rotors is only 3 lbs on the front brakes and a little over 1 lb on the rears. Unless you're flat out racing with the car it's unlikely you'd feel any difference in ride compliance, handling or braking distance.
The blank 370mm rotor weight is erroneous. Whoever originally typed that up hit a "3" instead of a "2."

Having owned a set of blank and dimpled/slotted rotors here are the weights I measured on my scales:
-Hella/Pagid 370x30mm, two-piece, dimpled & slotted, 26lbs
-Hella/Pagid 345x24mm, two-piece, dimpled & slotted, 19.2lbs
-OE 370x30mm, two-piece, blank, 26lbs
-OE 345x24mm, two-piece, blank, 19.2lbs

And for comparison my Stoptech ARK front rotors now are 24lbs each.
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      01-04-2019, 12:09 PM   #18
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Quote:
Originally Posted by kern417 View Post
I just did lightweight wheels, summer tires, etc. and with stock tune the car feels much more responsive and peppy. I don't want to go backwards on that progress. I'm sure it won't make a huge difference, but if I'm upgrading then I'm going to do it right.
You're going have to pay almost a grand to get a real 2 piece on the front and save weight over OE. Ecs and Stop tech are our only options, with none at all for the rears.

There was a thread I found several weeks ago in my search for the same (going to go BBK). Someone tried to have real 2piece floating rotors manufactured for our cars and it would be too expensive to make a true floating 2 piece rotor. (thread here: https://f30.bimmerpost.com/forums/sh....php?t=1410210)

Ecs was actually the least expensive 2piece in our market, that actually saves weight. However, I believe stoptech makes them as well since ECS owns them now.

Last edited by Logicoeur; 01-04-2019 at 12:37 PM.
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      01-04-2019, 12:39 PM   #19
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Quote:
Originally Posted by Logicoeur View Post
You're going have to pay almost a grand to get a real 2 piece on the front and save weight over OE. Ecs and Stop tech are our only options, with none at all for the rears.

There was a thread I found several weeks ago in my search for the same (going to go BBK). Someone tried to have real 2piece floating rotors manufactured for our cars and it would be too expensive to make a true floating 2 piece rotor. (thread here: https://f30.bimmerpost.com/forums/sh....php?t=1410210)

Ecs was actually the least expensive 2piece in our market, that actually saves weight. However, I believe stoptech makes them as well since ECS owns them now.
Why don't you consider the R1 concepts offerings 2 piece? I've seen several other 2-piece options, i just don't want the dimples on the rotors. Only slots.
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      01-04-2019, 01:21 PM   #20
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Quote:
Originally Posted by kern417 View Post
Quote:
Originally Posted by Logicoeur View Post
You're going have to pay almost a grand to get a real 2 piece on the front and save weight over OE. Ecs and Stop tech are our only options, with none at all for the rears.

There was a thread I found several weeks ago in my search for the same (going to go BBK). Someone tried to have real 2piece floating rotors manufactured for our cars and it would be too expensive to make a true floating 2 piece rotor. (thread here: https://f30.bimmerpost.com/forums/showthread.php?t=1410210)

Ecs was actually the least expensive 2piece in our market, that actually saves weight. However, I believe stoptech makes them as well since ECS owns them now.
Why don't you consider the R1 concepts offerings 2 piece? I've seen several other 2-piece options, i just don't want the dimples on the rotors. Only slots.
Wasn't aware of the R1 offering
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      01-04-2019, 02:07 PM   #21
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Their post in the vendor section does have this part in it, unless they came up with something recently.

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Originally Posted by r1concepts View Post
**ALUMINUM HAT FRONT ROTORS NOT AVAILABLE AT THE MOMENT, ONLY FULL CAST ROTORS**
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      01-04-2019, 02:09 PM   #22
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Quote:
Originally Posted by Logicoeur View Post
You're going have to pay almost a grand to get a real 2 piece on the front and save weight over OE. Ecs and Stop tech are our only options, with none at all for the rears.

There was a thread I found several weeks ago in my search for the same (going to go BBK). Someone tried to have real 2piece floating rotors manufactured for our cars and it would be too expensive to make a true floating 2 piece rotor. (thread here: https://f30.bimmerpost.com/forums/sh....php?t=1410210)

Ecs was actually the least expensive 2piece in our market, that actually saves weight. However, I believe stoptech makes them as well since ECS owns them now.
My StopTech ARKs (slotted version) were a hair over $700 shipped from TH Motorsports. They send out coupons regularly if you leave things in your cart and don't check out.
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