ERX Rear Derailleur (RD-ER1203-OP)

Specifications

Manufacturer
LTWOO
Name
ERX Rear Derailleur (RD-ER1203-OP)
Series
ERX
MPN
RD-ER1203-OP
Shifting Type
Wireless
Mount standard
Standard Hanger
Source
Catalog
Drivetrain Brand
Other
Electronic Shifting Family
Ltwoo Electronic
Rear Speeds
12

LTWOO ERX Rear Derailleur (RD-ER1203-OP)

Rear Derailleur

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Compatibility

This LTWOO ERX Rear Derailleur (RD-ER1203-OP) is a LTWOO General rear derailleur. It requires a 12-speed drivetrain and compatible components. It is designed for wireless shifting systems. For best performance, use with other ERX components, though it is mechanically compatible with the parts listed below.

Compatible Cassettes20

105 HG CASSETTE 12sCompatible

Shimano

105 HG CASSETTE 12s

  • Matches required 12-speed standard
ALFINE SINGLE SPROCKETCompatible

Shimano

ALFINE SINGLE SPROCKET

DEORE HYPERGLIDE+ CASSETTE 12sCompatible

Shimano

DEORE HYPERGLIDE+ CASSETTE 12s

  • Matches required 12-speed standard
  • Uses shimano hg plus standard
DEORE XT HYPERGLIDE+ CASSETTE 12s M8100Compatible

Shimano

DEORE XT HYPERGLIDE+ CASSETTE 12s M8100

  • Matches required 12-speed standard
  • Uses shimano hg plus standard
DEORE XT HYPERGLIDE+ CASSETTE 12s M8200Compatible

Shimano

DEORE XT HYPERGLIDE+ CASSETTE 12s M8200

  • Matches required 12-speed standard
  • Uses shimano hg plus standard
DURA-ACE HYPERGLIDE+ CASSETTE 12s Compatible

Shimano

DURA-ACE HYPERGLIDE+ CASSETTE 12s

  • Matches required 12-speed standard
  • Uses shimano hg plus standard
Force XG-1270 Cassette (CS-XG-1270-D1)Compatible

SRAM

Force XG-1270 Cassette (CS-XG-1270-D1)

  • Matches required 12-speed standard
  • Uses sram flattop standard
Force XG-1270 Cassette (CS-XG-1270-E1)Compatible

SRAM

Force XG-1270 Cassette (CS-XG-1270-E1)

  • Matches required 12-speed standard
  • Uses sram flattop standard
HG CASSETTE 12sCompatible

Shimano

HG CASSETTE 12s

  • Matches required 12-speed standard
  • Uses shimano hg standard
PG-1210 Eagle CassetteCompatible

SRAM

PG-1210 Eagle Cassette

  • Matches required 12-speed standard
  • Uses sram eagle standard
PG-1230 Eagle CassetteCompatible

SRAM

PG-1230 Eagle Cassette

  • Matches required 12-speed standard
  • Uses sram eagle standard
RED XG-1290 CassetteCompatible

SRAM

RED XG-1290 Cassette

  • Matches required 12-speed standard
  • Uses sram flattop standard
Rival XG-1250 CassetteCompatible

SRAM

Rival XG-1250 Cassette

  • Matches required 12-speed standard
  • Uses sram flattop standard
SLX HYPERGLIDE+ CASSETTE 12s Compatible

Shimano

SLX HYPERGLIDE+ CASSETTE 12s

  • Matches required 12-speed standard
  • Uses shimano hg plus standard
ULTEGRA HYPERGLIDE+ CASSETTE 12s (CS-R8100-12)Compatible

Shimano

ULTEGRA HYPERGLIDE+ CASSETTE 12s (CS-R8100-12)

  • Matches required 12-speed standard
  • Uses shimano hg plus standard
ULTEGRA HYPERGLIDE+ CASSETTE 12s (CS-R8101-12)Compatible

Shimano

ULTEGRA HYPERGLIDE+ CASSETTE 12s (CS-R8101-12)

  • Matches required 12-speed standard
  • Uses shimano hg plus standard
XG-1275 Eagle Cassette (CS-XG-1275-B1)Compatible

SRAM

XG-1275 Eagle Cassette (CS-XG-1275-B1)

  • Matches required 12-speed standard
  • Uses sram eagle standard
XG-1275 Eagle Cassette (CS-XG-1275-C1)Compatible

SRAM

XG-1275 Eagle Cassette (CS-XG-1275-C1)

  • Matches required 12-speed standard
  • Uses sram eagle standard
XG-1295 Eagle Cassette (CS-XG-1295-A3)Compatible

SRAM

XG-1295 Eagle Cassette (CS-XG-1295-A3)

  • Matches required 12-speed standard
  • Uses sram eagle standard
XG-1295 Eagle Cassette (CS-XG-1295-B1)Compatible

SRAM

XG-1295 Eagle Cassette (CS-XG-1295-B1)

  • Matches required 12-speed standard
  • Uses sram eagle standard

Compatible Cranksets20

105 CRANKSET 2X12sCompatible

Shimano

105 CRANKSET 2X12s

  • Matches required 12-speed standard
ALFINE CRANKSET WITH CHAIN GUARDCompatible

Shimano

ALFINE CRANKSET WITH CHAIN GUARD

Apex 1 Wide CranksetCompatible

SRAM

Apex 1 Wide Crankset

  • Matches required 12-speed standard
CRANKSET 2X12sCompatible

Shimano

CRANKSET 2X12s

  • Matches required 12-speed standard
  • Uses shimano hg standard
CRANKSET FOR 135/142 MM O.L.D. FRAMES 2X12sCompatible

Shimano

CRANKSET FOR 135/142 MM O.L.D. FRAMES 2X12s

  • Matches required 12-speed standard
  • Uses shimano hg standard
CRANKSET FOR 135/142/148 MM O.L.D. FRAMES 1X12sCompatible

Shimano

CRANKSET FOR 135/142/148 MM O.L.D. FRAMES 1X12s

  • Matches required 12-speed standard
  • Uses shimano hg standard
CRANKSET FOR 148 MM O.L.D. FRAMES 1X12sCompatible

Shimano

CRANKSET FOR 148 MM O.L.D. FRAMES 1X12s

  • Matches required 12-speed standard
  • Uses shimano hg standard
CRANKSET FOR 148 MM O.L.D. FRAMES 2X12sCompatible

Shimano

CRANKSET FOR 148 MM O.L.D. FRAMES 2X12s

  • Matches required 12-speed standard
  • Uses shimano hg standard
DEORE CRANKSET FOR 142/148 MM O.L.D. FRAMES 1X12s 1xCompatible

Shimano

DEORE CRANKSET FOR 142/148 MM O.L.D. FRAMES 1X12s 1x

  • Matches required 12-speed standard
  • Uses shimano hg standard
DEORE CRANKSET FOR 142/148 MM O.L.D. FRAMES 1X12s M6100 1xCompatible

Shimano

DEORE CRANKSET FOR 142/148 MM O.L.D. FRAMES 1X12s M6100 1x

  • Matches required 12-speed standard
  • Uses shimano hg plus standard
DEORE CRANKSET FOR 148 MM O.L.D. FRAMES 1X12sCompatible

Shimano

DEORE CRANKSET FOR 148 MM O.L.D. FRAMES 1X12s

  • Matches required 12-speed standard
  • Uses shimano hg plus standard
DEORE CRANKSET FOR 157 MM O.L.D. FRAMES 1X12sCompatible

Shimano

DEORE CRANKSET FOR 157 MM O.L.D. FRAMES 1X12s

  • Matches required 12-speed standard
  • Uses shimano hg plus standard
DEORE XT CRANKSET 176 MM Q-FACTOR 55 MM CHAIN LINE 12sCompatible

Shimano

DEORE XT CRANKSET 176 MM Q-FACTOR 55 MM CHAIN LINE 12s

  • Matches required 12-speed standard
DEORE XT CRANKSET 48.8 MM CHAIN LINE 2X12sCompatible

Shimano

DEORE XT CRANKSET 48.8 MM CHAIN LINE 2X12s

  • Matches required 12-speed standard
  • Uses shimano hg plus standard
DEORE XT CRANKSET 51.8 MM CHAIN LINE 2X12sCompatible

Shimano

DEORE XT CRANKSET 51.8 MM CHAIN LINE 2X12s

  • Matches required 12-speed standard
  • Uses shimano hg plus standard
DEORE XT CRANKSET 52 MM CHAIN LINE 1X12sCompatible

Shimano

DEORE XT CRANKSET 52 MM CHAIN LINE 1X12s

  • Matches required 12-speed standard
  • Uses shimano hg plus standard
DEORE XT CRANKSET 56.5 MM CHAIN LINE 1X12sCompatible

Shimano

DEORE XT CRANKSET 56.5 MM CHAIN LINE 1X12s

  • Matches required 12-speed standard
  • Uses shimano hg plus standard
DEORE XT E-BIKE HOLLOWTECH CRANK ARM SET M8000Compatible

Shimano

DEORE XT E-BIKE HOLLOWTECH CRANK ARM SET M8000

  • Uses shimano hg standard
DEORE XT E-BIKE HOLLOWTECH CRANK ARM SET M8100Compatible

Shimano

DEORE XT E-BIKE HOLLOWTECH CRANK ARM SET M8100

  • Uses shimano hg plus standard
DURA-ACE CRANKSET 2X12sCompatible

Shimano

DURA-ACE CRANKSET 2X12s

  • Matches required 12-speed standard

Compatible Chains20

12s PowerLockCompatible

SRAM

12s PowerLock

  • Matches required 12-speed standard
  • Uses sram flattop standard
ALFINE DOUBLE PULLEY CHAIN TENSIONERCompatible

Shimano

ALFINE DOUBLE PULLEY CHAIN TENSIONER

ALFINE SINGLE FIXED PULLEY CHAIN TENSIONERCompatible

Shimano

ALFINE SINGLE FIXED PULLEY CHAIN TENSIONER

Apex ChainCompatible

SRAM

Apex Chain

  • Matches required 12-speed standard
  • Uses sram flattop standard
CHAIN DEVICE 11/12sCompatible

Shimano

CHAIN DEVICE 11/12s

  • Matches required 12-speed standard
  • Uses shimano hg standard
CHAIN DEVICE D-TYPE MOUNTCompatible

Shimano

CHAIN DEVICE D-TYPE MOUNT

  • Uses shimano hg standard
CHAIN DEVICE E-TYPE MOUNTCompatible

Shimano

CHAIN DEVICE E-TYPE MOUNT

  • Uses shimano hg standard
CHAIN DEVICE ISCG05 MOUNTCompatible

Shimano

CHAIN DEVICE ISCG05 MOUNT

  • Uses shimano hg standard
CN-M6100 HYPERGLIDE+ CHAIN 12sCompatible

Shimano

CN-M6100 HYPERGLIDE+ CHAIN 12s

  • Matches required 12-speed standard
  • Uses shimano hg plus standard
CN-M7100 HYPERGLIDE+ CHAIN 12sCompatible

Shimano

CN-M7100 HYPERGLIDE+ CHAIN 12s

  • Matches required 12-speed standard
  • Uses shimano hg plus standard
CN-M8100 HYPERGLIDE+ CHAIN 12sCompatible

Shimano

CN-M8100 HYPERGLIDE+ CHAIN 12s

  • Matches required 12-speed standard
  • Uses shimano hg plus standard
CN-M9100 HYPERGLIDE+ CHAIN 12sCompatible

Shimano

CN-M9100 HYPERGLIDE+ CHAIN 12s

  • Matches required 12-speed standard
  • Uses shimano hg plus standard
Eagle 70 Transmission Flattop ChainCompatible

SRAM

Eagle 70 Transmission Flattop Chain

  • Matches required 12-speed standard
  • Uses sram eagle standard
Eagle PowerLockCompatible

SRAM

Eagle PowerLock

  • Matches required 12-speed standard
  • Uses sram eagle standard
Eagle S100 ChainCompatible

SRAM

Eagle S100 Chain

  • Matches required 12-speed standard
  • Uses sram eagle standard
Eagle S200 ChainCompatible

SRAM

Eagle S200 Chain

  • Matches required 12-speed standard
  • Uses sram eagle standard
Eagle S500 ChainCompatible

SRAM

Eagle S500 Chain

  • Matches required 12-speed standard
  • Uses sram eagle standard
Eagle Transmission PowerLockCompatible

SRAM

Eagle Transmission PowerLock

  • Matches required 12-speed standard
  • Uses sram eagle standard
Force Chain (CN-FRC-D1)Compatible

SRAM

Force Chain (CN-FRC-D1)

  • Matches required 12-speed standard
  • Uses sram flattop standard
Force Chain (CN-FRC-E1)Compatible

SRAM

Force Chain (CN-FRC-E1)

  • Matches required 12-speed standard
  • Uses sram flattop standard

Frequently Asked Questions

What fits with LTWOO ERX Rear Derailleur (RD-ER1203-OP)?

LTWOO ERX Rear Derailleur (RD-ER1203-OP) is compatible with cassettes, cranksets, chains, shifters that match its technical standards. Most importantly, it requires matching 12-speed components.

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

No, LTWOO ERX Rear Derailleur (RD-ER1203-OP) requires a 12-speed chain. Chains for different speeds have different external widths and internal profiles, which will cause poor shifting or mechanical interference.