LTWOO ER7 Rear Derailleur (RD-ER1003-M-A)
Rear Derailleur
Specifications
- Manufacturer
- LTWOO
- Name
- ER7 Rear Derailleur (RD-ER1003-M-A)
- Series
- ER7
- MPN
- RD-ER1003-M-A
- Rear Speeds
- 10
- 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 ER7 Rear Derailleur (RD-ER1003-M-A) is a LTWOO rear derailleur. It is a 10-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.
ER7 Groupset7
A groupset is designed and tested as one system, so these are the most reliable match. Other compatible parts are listed below.
RecommendedLTWOO
ER7 Shifter (ST-ER1002-2L)
- Ships in the ER7 Groupset
RecommendedLTWOO
ER7 Shifter (ST-ER1002-R)
- Ships in the ER7 Groupset
RecommendedLTWOO
ER7 Front Derailleur (FD-ER1004)
- Ships in the ER7 Groupset
RecommendedLTWOO
Brake Caliper (BR-R03A-140R)
- Ships in the ER7 Groupset
RecommendedLTWOO
Brake Caliper (BR-R06A-140F)
- Ships in the ER7 Groupset
RecommendedLTWOO
Brake Rotor (RT-R00-140)
- Ships in the ER7 Groupset
RecommendedLTWOO
Brake Rotor (RT-R00-160)
- Ships in the ER7 Groupset
Chains for this derailleur14
Shares a standardShimano
CN-HG54 DEORE MTB CHAIN 10s
- Both are 10-speed
Shares a standardShimano
CN-HG95 HG-X CHAIN 10s
- Both are 10-speed
Shares a standardKMC
DLC 10
- Both are 10-speed
Shares a standardKMC
e10
- Both are 10-speed
Shares a standardKMC
eGlide
- Both are 10-speed
Shares a standardFSA
K-FORCE LIGHT 10 SPEED CHAIN
- Both are 10-speed
Shares a standardSRAM
PC-1031 Chain
- Both are 10-speed
Shares a standardSRAM
PC-1051 Chain
- Both are 10-speed
Shares a standardSRAM
PC-1071 Chain
- Both are 10-speed
Shares a standardSRAM
PC-1091R Chain
- Both are 10-speed
Shares a standardFSA
Team Issue Chain
- Both are 10-speed
Shares a standardKMC
X10
- Both are 10-speed
Shares a standardKMC
X10SL
- Both are 10-speed
Shares a standardKMC
XGlide
- Both are 10-speed
Cassettes for this derailleur6
microSHIFT
G-Series 10 Speed Cassette 11-25
- Both are 10-speed
- Both are microSHIFT drivetrain parts
microSHIFT
G-Series 10 Speed Cassette 11-28
- Both are 10-speed
- Both are microSHIFT drivetrain parts
microSHIFT
H-Series 10 Speed Cassette 11-25
- Both are 10-speed
- Both are microSHIFT drivetrain parts
microSHIFT
H-Series 10 Speed Cassette 11-28
- Both are 10-speed
- Both are microSHIFT drivetrain parts
microSHIFT
H-Series 10 Speed Cassette 11-32
- Both are 10-speed
- Both are microSHIFT 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
RecommendedLTWOO
ER7 Shifter (ST-ER1002-2L)
- Both use wireless actuation
- Both are LTWOO drivetrain parts
RecommendedLTWOO
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 ER7 Rear Derailleur (RD-ER1003-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 ER7 Rear Derailleur (RD-ER1003-M-A)?
No. LTWOO ER7 Rear Derailleur (RD-ER1003-M-A) is a 10-speed component and needs a 10-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.