12-17-2023, 10:51 AM | #1 |
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Brake Rotor Question
OK.
I have a CS red calipers. Assuming that the fronts are 400mm. Ordered some Giros accordingly. It is advertised as using several color calipers including red. The rears on the site are advertised as 400 mm as well. I thought they were 380mm? Are the rears 400mm as well? Thank you. |
12-17-2023, 02:34 PM | #2 | |
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12-17-2023, 05:27 PM | #4 |
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Ok thanks guys I’ll call them tomorrow to clarify
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12-18-2023, 11:40 AM | #5 |
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Didn’t doubt you guys as I’m replacing these for floating rotors
380 mm Thanks again Last edited by look585; 12-18-2023 at 02:21 PM.. |
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12-18-2023, 02:23 PM | #6 |
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Can anyone confirm these are the correct part number Manufacturer Part Number
A2-220 for the rears GiroDisc |
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12-20-2023, 04:36 PM | #8 |
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Done
https://girodisc.com/bmw-f8x-m2-m3-m...m-rear-rotors/ BMW F8X M2, M3, M4 380mm Rear Rotors SKU: A2-220 Other sites have it advertised as 400mm even though it's not. Ordered. |
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12-27-2023, 09:19 PM | #9 |
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The rears on. The fronts coming.
Just getting her ready for the track. Sorry about the pics. |
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12-28-2023, 03:08 AM | #10 |
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How did the bell look like on the inside? Is there a pressed in metal ring for the emergency brake like the OEM discs?
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12-28-2023, 08:56 AM | #11 |
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12-29-2023, 07:30 AM | #12 |
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12-29-2023, 05:34 PM | #14 |
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Feels like the brake shoes will eat through the aluminium bell quite fast if there's no steel ring, no emergency brake turns for you mister.
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12-29-2023, 05:41 PM | #15 | |
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My 034 motorsport rotors had a separate steel bell that was removeable and replaceable if needed. It was held on via the lug bolts and rotor bolts.
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12-30-2023, 12:14 AM | #16 |
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Regarding the steel ring. Whether the shoes are squeezing against steel or aluminum it really makes no difference. It's not like the shoes are doing anything to slow the car down like the rotors on a consistent basis.
It's the E-Brake, is either off or on. Debate welcome. |
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12-30-2023, 12:16 AM | #17 |
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I don't think it matters as long as the hat is machined so there is contact. I agree with you. Not much wear going to happen unless you're using the brake frequently while driving.
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12-30-2023, 10:37 AM | #18 |
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I'm thinking the steel is there for a reason. Maybe to stop the deformity of the alum hat. when the ebrake is applied.
I'll be sure not to apply after some hot laps |
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01-06-2024, 01:52 PM | #19 |
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If anyone is interested in Girodisc or Paragon two-piece rotors, don't hesitate to reach out to us with any questions you might have or for quotes.
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01-14-2024, 12:51 PM | #20 | |
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Coefficient of friction between Aluminum and Steel is 0.61. So the difference between an Aluminum and steel brake drum is you have to pull the handbrake farther to get the same parking brake holding torque. Deformation differences are negligible. |
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