LTWOO ERX Rear Derailleur (RD-ER1203-M-C)

Rear Derailleur

Specifications

Manufacturer: LTWOO
Name: ERX Rear Derailleur (RD-ER1203-M-C)
Series: ERX
MPN: RD-ER1203-M-C
Rear Speeds: 12
Drivetrain Brand: Other
Shifting Type: Wireless
Electronic Shifting Family: Ltwoo Electronic
Max Cog (T): 32
Weight (g): 288
Mount standard: Standard Hanger

Compatibility

LTWOO ERX Rear Derailleur (RD-ER1203-M-C) is a LTWOO rear derailleur. It is a 12-speed component. It uses wireless shifting. Everything listed below was matched on a specification we hold for both parts: the interface each pairing actually depends on, such as freehub body, speed count, actuation or mounting standard. Where we could not verify that interface, the part is left out rather than assumed to fit.

ERX Groupset7

A groupset is designed and tested as one system, so these are the most reliable match. Other compatible parts are listed below.

Recommended

LTWOO

ERX Shifter (ST-ER1202-2L-C)

Ships in the ERX Groupset

Recommended

LTWOO

ERX Shifter (ST-ER1202-R-C)

Ships in the ERX Groupset

Recommended

LTWOO

ERX Front Derailleur (FD-ER1204)

Ships in the ERX Groupset

Recommended

LTWOO

Brake Caliper (BR-R03A-140R)

Ships in the ERX Groupset

Recommended

LTWOO

Brake Caliper (BR-R06A-140F)

Ships in the ERX Groupset

Recommended

LTWOO

Brake Rotor (RT-R00-140)

Ships in the ERX Groupset

Recommended

LTWOO

Brake Rotor (RT-R00-160)

Ships in the ERX Groupset

Chains for this derailleur20

Mechanically compatible

SRAM

Apex Chain

Both are 12-speed

Mechanically compatible

Shimano

CN-M6100 HYPERGLIDE+ CHAIN 12s

Both are 12-speed

Mechanically compatible

Shimano

CN-M7100 HYPERGLIDE+ CHAIN 12s

Both are 12-speed

Mechanically compatible

Shimano

CN-M8100 HYPERGLIDE+ CHAIN 12s

Both are 12-speed

Mechanically compatible

Shimano

CN-M9100 HYPERGLIDE+ CHAIN 12s

Both are 12-speed

Mechanically compatible

SRAM

Eagle 70 Transmission Flattop Chain

Both are 12-speed

Mechanically compatible

SRAM

Eagle S100 Chain

Both are 12-speed

Mechanically compatible

SRAM

Eagle S200 Chain

Both are 12-speed

Mechanically compatible

SRAM

Eagle S500 Chain

Both are 12-speed

Mechanically compatible

SRAM

Force Chain (CN-FRC-D1)

Both are 12-speed

Mechanically compatible

SRAM

Force Chain (CN-FRC-E1)

Both are 12-speed

Mechanically compatible

SRAM

GX Eagle Chain

Both are 12-speed

Mechanically compatible

SRAM

GX Eagle Transmission Flattop Chain

Both are 12-speed

Mechanically compatible

FSA

K-FORCE LIGHT MTB 12 SPEED CHAIN

Both are 12-speed

Mechanically compatible

SRAM

NX Eagle Chain

Both are 12-speed

Mechanically compatible

SRAM

RED Chain

Both are 12-speed

Mechanically compatible

SRAM

Rival Chain (CN-RIV-D1)

Both are 12-speed

Mechanically compatible

SRAM

Rival Chain (CN-RIV-E1)

Both are 12-speed

Mechanically compatible

SRAM

X0 Eagle Transmission Flattop Chain

Both are 12-speed

Mechanically compatible

SRAM

X01 Eagle Chain

Both are 12-speed

Shifters that drive this derailleur3

Recommended

LTWOO

ERX Shifter (ST-ER1202-2L-C)

Both are 12-speed
Both use wireless actuation

Recommended

LTWOO

ERX Shifter (ST-ER1202-R-C)

Both are 12-speed
Both use wireless actuation

Recommended

LTWOO

Shift Switch (SW-ET1203)

Both are 12-speed
Both use wireless actuation

Frequently Asked Questions

What fits LTWOO ERX Rear Derailleur (RD-ER1203-M-C)?

On this page we list chains for this derailleur, shifters that drive this derailleur. Each listing was matched on a specification we hold for both parts; anything we could not verify is omitted rather than assumed to fit.

Can I use a higher or lower speed chain with LTWOO ERX Rear Derailleur (RD-ER1203-M-C)?

No. LTWOO ERX Rear Derailleur (RD-ER1203-M-C) is a 12-speed component and needs a 12-speed chain. Chains for different speed counts have different external widths and inner-plate profiles, which causes poor shifting or interference with the neighbouring sprockets.