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RB 2pc rotor (Open Slot) for BMW 135i REAR 07-13
Two-piece rotor (Open Slot) - 135i REAR 2008+
This product photo is for reference only.
MSRP (pair): $928.79
Sale Price (pair): $835.91
You save $92.88!

Price with Selected Options: $835.91
Size: 322x22mm (OE is 324x20mm)
Rotor Wt (lbs.): 12.2

Availability: Usually Ships in 2 to 3 Days
Product Code: 2167

RB-Brake Pad

XR70 - Racing (PD1368-3R7 [Add $90.58]


Note: Rotor can only be made 48mm annulus in order to retain rear drum emergency brake, so you need to trim OE pad at the bottom (~5mm) to avoid overhang. This package includes a set of street pads (PD1368, same rear pad as Mitsubishi EVO X) that fits under 135i OE caliper w/o having to trim like OE. Furthermore this pad shape gives you even with more compound choice than 135i OE pads.
Why we can't make the rear two piece rotor to fit OE pads?

These two-piece rotors were engineered to be the best stock replacement two-piece rotor on the performance market. This rotor is direct bolt-on, easy to install, no additional hardware needed, and an excellent upgrade for both street and track. They can deliver consistent brake torque under extreme heat, session after session. When it comes to replacement - operating cost over the time will be lower than one-piece rotor.

RB rotors are made of harder iron than OE rotors. Our rotors are most compatible with semi-metallic brake pads. We do not recommend the use of ceramic brake pads, which may cause vibration.

Rotor Material: Racing Formula Alloyed Gray Iron & Heat treated
Machining: Open Slot
Surface: EDP Coating w/cross cut grinding on friction surface

Click here to learn how RB two-piece rotors are built differently than the competition.


  1. Alloyed iron formula adds strength and heat resistance. Heat treating further improves rotor performance for a more uniform and stabilized microstructure.


The cooling vanes are of a convergent nozzle design, which increases airflow and turbulence and makes discs cooler. (Illustration #1)

The center-mount flanges for hat mounting to the rotor ring have several benefits. (Illustration #2)
    • It allows the ring to be used on either side of the vehicle simply by mounting the hat on either side of the ring (unidirectional).
    • The stress load transferred from the ring to the hat is balanced.
    • Air inlets are widely open to both inboard and outboard sides of the rotor. More air suctions and even temperature on both sides of the disc surface.
    • Heat transfer from the disc surfaces to the hat is even and minimized by increasing the flange length and the airflow around the flanges.
    • Mounting flanges are on both friction surfaces ultimately provides excellent heat balance.
  1. Exclusive full floating design with 10.9 grade alloyed hardware. Hardware is DACRO coated and crimp locking. DACRO is highly corrosion resistant and provides a film for easier movement between the hat and rotor ring as disc expands and contracts and the crimp design provides positive engagement without rattling or torque loss at temperature.

Related Links:
Two-Piece Feature Comparison Chart

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