LTWOO ER9 Rear Derailleur (RD-ER1103-M-A)
Rear Derailleur
Specifications
- Manufacturer
- LTWOO
- Name
- ER9 Rear Derailleur (RD-ER1103-M-A)
- Series
- ER9
- MPN
- RD-ER1103-M-A
- Rear Speeds
- 11
- Drivetrain Brand
- Other
- Shifting Type
- Wireless
- Electronic Shifting Family
- Ltwoo Electronic
- Max Cog (T)
- 32[1]
- Mount Standard
- Standard Hanger
- Weight (g)
- 295[1]
- Sources
- [1] ltwoo.com, checked 10 Aug 2026: Max Cog (T), Weight (g)
Compatibility
LTWOO ER9 Rear Derailleur (RD-ER1103-M-A) is a LTWOO rear derailleur. It is an 11-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.
ER9 Groupset5
A groupset is designed and tested as one system, so these are the most reliable match. Other compatible parts are listed below.
RecommendedLTWOO
ER9 Front Derailleur (FD-ER1104)
- Ships in the ER9 Groupset
RecommendedLTWOO
Brake Caliper (BR-R03A-140R)
- Ships in the ER9 Groupset
RecommendedLTWOO
Brake Caliper (BR-R06A-140F)
- Ships in the ER9 Groupset
RecommendedLTWOO
Brake Rotor (RT-R00-140)
- Ships in the ER9 Groupset
RecommendedLTWOO
Brake Rotor (RT-R00-160)
- Ships in the ER9 Groupset
Chains for this derailleur20
Shares a standardShimano
CN-HG601-11 LINKGLIDE, HG CHAIN 11s
- Both are 11-speed
Shares a standardShimano
CN-HG701-11 LINKGLIDE, HG CHAIN 11s
- Both are 11-speed
Shares a standardShimano
CN-LG500 LINKGLIDE CHAIN 10/11s
- Both are 11-speed
Shares a standardKMC
DLC 11
- Both are 11-speed
Shares a standardKMC
e11
- Both are 11-speed
Shares a standardKMC
eGlide
- Both are 11-speed
Shares a standardFSA
K-FORCE LIGHT 11 SPEED CHAIN
- Both are 11-speed
Shares a standardFSA
K-FORCE LIGHT MTB 11 SPEED CHAIN
- Both are 11-speed
Shares a standardFSA
K-Force WE 11 SPEED CHAIN
- Both are 11-speed
Shares a standardSRAM
PC-1110 Chain
- Both are 11-speed
Shares a standardSRAM
PC-1130 Chain
- Both are 11-speed
Shares a standardSRAM
PC-1170 Chain
- Both are 11-speed
Shares a standardSRAM
PC-X1 Chain
- Both are 11-speed
Shares a standardSRAM
RED 22 Chain
- Both are 11-speed
Shares a standardFSA
SF11 E-BIKE 11 SPEED CHAIN
- Both are 11-speed
Shares a standardFSA
Team Issue Chain
- Both are 11-speed
Shares a standardKMC
WAX DLC 11
- Both are 11-speed
Shares a standardKMC
WAX TT 11
- Both are 11-speed
Shares a standardKMC
WAX X11
- Both are 11-speed
Shares a standardKMC
WAX X11EL
- Both are 11-speed
Cassettes for this derailleur8
microSHIFT
G-Series 11 Speed Cassette 11-25
- Both are 11-speed
- Both are microSHIFT drivetrain parts
microSHIFT
G-Series 11 Speed Cassette 11-28
- Both are 11-speed
- Both are microSHIFT drivetrain parts
microSHIFT
G-Series 11 Speed Cassette 11-32
- Both are 11-speed
- Both are microSHIFT drivetrain parts
microSHIFT
H-Series 11 Speed Cassette 11-25
- Both are 11-speed
- Both are microSHIFT drivetrain parts
microSHIFT
H-Series 11 Speed Cassette 11-28
- Both are 11-speed
- Both are microSHIFT drivetrain parts
microSHIFT
H-Series 11 Speed Cassette 11-32
- Both are 11-speed
- Both are microSHIFT drivetrain parts
Shares a standardFSA
K-FORCE CASSETTE
- Both are 11-speed
- Both are FSA drivetrain parts
Shares a standardFSA
K-FORCE WE12S
- Both are FSA drivetrain parts
- The cassette's 32T largest cog is within the derailleur's 32T maximum
Shifters that drive this derailleur5
Mechanically compatibleLTWOO
ER7 Shifter (ST-ER1002-2L)
- Both use wireless actuation
- Both are LTWOO drivetrain parts
Mechanically compatibleLTWOO
ER7 Shifter (ST-ER1002-R)
- Both use wireless actuation
- Both are LTWOO drivetrain parts
Mechanically compatibleLTWOO
ERX Shifter (ST-ER1202-2L-C)
- Both use wireless actuation
- Both are LTWOO drivetrain parts
Mechanically compatibleLTWOO
ERX Shifter (ST-ER1202-R-C)
- Both use wireless actuation
- Both are LTWOO drivetrain parts
Mechanically compatibleLTWOO
Shift Switch (SW-ET1203)
- Both use wireless actuation
- Both are LTWOO drivetrain parts
Frequently Asked Questions
What fits LTWOO ER9 Rear Derailleur (RD-ER1103-M-A)?
On this page we list chains for this derailleur, cassettes 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 ER9 Rear Derailleur (RD-ER1103-M-A)?
No. LTWOO ER9 Rear Derailleur (RD-ER1103-M-A) is an 11-speed component and needs an 11-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.