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      05-30-2012, 01:19 AM   #1
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E9x OEM Brake Rotor Dimensions

This is just a cache for E9x M3 brake rotor dimensions/information I'm posting for posterity, there won't be much interesting to see here, honestly. Non-OEM front and rear 2-piece E9x rotors can be sourced from RacingBrake, details in this thread. I loathe the duplication of information, but for this, it's not always a bad thing, and it may be of more use m3post than m3forum.net.
  • Front
    - Part number Left: 34112283385 (until 01/2010)
    - Part number Left: 34112283801 (after 01/2010)
    - Part number Right: 34112283386 (until 01/2010)
    - Part number Right: 34112283802 (after 01/2010)
    - outside diameter: 360.0 mm (14.17")
    - annulus diameter: 234.0 mm (9.21")
    - face width: 63.0 mm (2.48")
    - overall depth: 63.0 mm (2.48")
    - initial disc thickness: 30.0 mm (1.18")
    - discard thickness: 28.4 mm (1.12")
    - bore diameter: 79.0 mm (3.11")
    - hub to center disc distance: 48.0 mm (1.89")
    - lug spacing: 5 x 120 mm
    - internal hub clearance: ~182 mm (7.17") (tapered)
    - mass: ~10.32 kg
    - weight: ~22.7 lbs
  • Rear:
    - Part number Left: 34212283387 (until 01/2010)
    - Part number Left: 34212283803 (after 01/2010)
    - Part number Right: 34212283388 (until 01/2010)
    - Part number Right: 34212283804 (after 01/2010)
    - outside diameter: 350.0 mm (13.78")
    - annulus diameter: 220.0 mm (8.66")
    - face width: 65 mm (2.56")
    - overall depth: 66 mm (2.60")
    - initial disc thickness: 24.0 mm (0.945")
    - discard thickness: 22.4 mm (0.882")
    - bore diameter: 79.0 mm (3.11")
    - hub to center disc distance: 51.0 mm (2.01")
    - lug spacing: 5 x 120 mm
    - internal parking brake shoe diameter: 185 mm (7.28")
    - mass: ~8.95 kg
    - weight: ~19.7 lbs

If anyone has missing specifications or something to add, please don't hesitate to contribute.

Search Terms: E90, E92, E93, front rotor dimensions, rear rotor dimensions
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      05-30-2012, 01:26 AM   #2
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minimum rotor thickness might help. think the front is 28mm and rear is 22mm if i remember right.
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      05-30-2012, 01:35 AM   #3
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Quote:
Originally Posted by chriszeh View Post
minimum rotor thickness might help. think the front is 28mm and rear is 22mm if i remember right.
It's 30mm and 24mm, mic'd 'em last night.
Edit: for initial thickness..

Minimum rotor thickness is already listed as discard thickness, if that's what you mean?
Edit: discard is 28.4mm and 22.4mm, respectively.

Thanks for reviewing the info; a sanity check is always welcome.
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      05-30-2012, 01:39 AM   #4
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yep missed that. that is what i mean. same thing. you sure its 28.4 i was told by SA it was 28 but you know how they are sometimes.
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      05-30-2012, 01:52 AM   #5
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Quote:
Originally Posted by chriszeh View Post
yep missed that. that is what i mean. same thing. you sure its 28.4 i was told by SA it was 28 but you know how they are sometimes.
All good, better to have another set of eyes run over it either way; besides, who really throws away these rotors when they're down 1.6mm?!?

If anyone is considering such an act, please call me first...
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