Shimano RT-EM300 Center Lock Brake Rotor for STEPS

The Shimano STEPS RT-EM300 Brake Rotor - Compatible with SM-DUE11 speed sensor

The RT-EM300 is a low-cost center lock brake rotor for organic brake pads, which comes with an integrated magnet for the Shimano SM-DUE11 or EW-SS301 speed sensor. This makes it suitable for touring, city and MTB e-bikes with STEPS or EP8 drivetrains and is only intended for use on the rear wheel. The brake rotor is based on a 2-piece stainless steel construction with steel spider and is attached via a lockring that is geared on both the outside and inside. It can be used in combination with almost all hydraulic Shimano disc brakes.

Guidelines for Replacing E-bike Components:

Before you replace components on your e-bike, please read through the guidelines for component replacement for CE-marked e-bikes/pedelecs with pedal assistance.

Technical Information:

Mount:

Center Lock

Diameter:

160 mm, 180 mm, 203 mm

Design:

2-piece

Rotor Material:

stainless steel

Spider Material:

steel

Approved For:

Brake Compatibility:

BR-M9100*, BR-M9120, BR-M9110-R**, BR-M9000, BR-M9020, BR-M8100, BR-M8120, BR-M8110-R*, BR-M8000, BR-M8020, BR-M7100, BR-M7120, BR-M7110-R*, BR-M7000, BR-M6100, BR-M6120, BR-M6000, BR-MT520, BR-MT420, BR-M820, BR-M640, BR-U8000, BR-U8020, BR-S7000, BR-S700, BR-T675*, BR-T615*, BR-M4050*, BR-MT500*, BR-M446*, BR-MT410, BR-MT400*, BR-M3050*, BR-M395*, BR-M375*, BR-MT200*, BR-M365*, BR-M315*, BR-TX805*, BR-UR300*, BR-R9270**, BR-R9170-R**, BR-R8170*, BR-R8070*, BR-R7170*, BR-R7070*, BR-4770*, BR-RS805*, BR-R785*, BR-RS785*, BR-RS505*, BR-RS405*, BR-RX820*, BR-RX820-LE*, BR-RX810*, BR-RX400*

Brake Pad Compatibility:

organic

* not compatible with 203 mm
** only 160 mm

Compatibility:

• SM-DUE11 speed sensor
• EW-SS301 speed sensor
• DU-EP800 Motor
• DU-EP801 Motor
• DU-EP600 Motor
• DU-E7000 Motor
• DU-E6100 Motor
• DU-E5000 Motor
• DU-E8080 Motor (Japanese market only)
• DU-E6180 Motor (Japanese market only)
• DU-E5080 Motor (Japanese market only)
• for brake pads with wide and narrow pad shape
• only for use on the rear wheel (in combination with e.g. SM-RT30 on the front wheel)

Features:

• including magnet for Shimano STEPS speed sensor SM-DUE11 / EW-SS301
• performance indicator: Select (level 1 out of 3)
• quick and easy mounting thanks to Center Lock
• painted spider, polished rotor
• lockring made of steel with internal and external toothing, lacquered

Manufacturer Numbers:

160 mm:

E-RTEM300S

180 mm:

E-RTEM300M

203 mm:

E-RTEM300L

Contents:

• 1 x Shimano RT-EM300 brake rotor with magnet for speed sensor
• 1 x Shimano lockrings