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(English)
DM-GARD001-02
Dealer's Manual
ROAD MTB Trekking
GRX
RD-RX810
RD-RX812
RD-RX400
City Touring/
Comfort Bike
URBAN SPORT E-BIKE
Rear Derailleur
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Contents
Contents ...................................................................................2
IMPORTANT NOTICE ..................................................................3
TO ENSURE SAFETY ................................................................... 4
List of tools to be used ............................................................ 6
Installation/removal ................................................................7
Installing the rear derailleur ..................................................................7
• Standard type ........................................................................................................................... 7
• Direct mount type .................................................................................................................... 9
Adjustment ............................................................................. 11
Adjusting the stroke on the high limit ...............................................11
Installing the chain ...............................................................................11
Checking the chain length ................................................................... 11
Connection and securing of the inner cable ......................................14
• Outer casing length ................................................................................................................ 14
• Connection and securing of the inner cable ........................................................................ 16
Adjusting the stroke on the low limit ................................................18
Adjusting the B-screw ..........................................................................19
SIS adjustment ......................................................................................20
Maintenance ........................................................................... 22
Replacing the pulleys ........................................................................... 22
Applying grease to the chain stabilizer ..............................................23
Adjusting friction .................................................................................24
Replacement of the plate and the plate tension spring ...................28
• Removal .................................................................................................................................. 28
• Installation .............................................................................................................................. 31
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IMPORTANT NOTICE
IMPORTANT NOTICE
• This dealer's manual is intended primarily for use by professional bicycle mechanics.
Users who are not professionally trained for bicycle assembly should not attempt to
install the components themselves using the dealer's manuals.
If any part of the information on the manual is unclear to you, do not proceed with the
installation. Instead, contact your place of purchase or a distributor for assistance.
• Make sure to read all manuals included with the product.
• Do not disassemble or modify the product other than as stated in the information
contained in this dealer's manual.
• All manuals and technical documents are accessible online at https://si.shimano.com.
• For consumers who do not have easy access to the internet, please contact a SHIMANO
distributor or any of the SHIMANO offices to obtain a hardcopy of the User's Manual.
• Please observe the appropriate rules and regulations of the country, state or region in
which you conduct your business as a dealer.
For safety, be sure to read this dealer's manual thoroughly before use, and
follow it for correct use.
The following instructions must be observed at all times in order to prevent personal injury
and physical damage to equipment and surroundings.
The instructions are classified according to the degree of danger or damage which may occur
if the product is used incorrectly.
Failure to follow the instructions will result in death or serious
DANGER
WARNING
injury.
Failure to follow the instructions could result in death or
serious injury.
CAUTION
Failure to follow the instructions could cause personal injury or
physical damage to equipment and surroundings.
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TO ENSURE SAFETY
TO ENSURE SAFETY
WARNING
• Be sure to follow the instructions provided in the manuals when installing the product.
Only use SHIMANO genuine parts. If a component or replacement part is incorrectly
assembled or adjusted, it can lead to component failure and cause the rider to lose
control and crash.
•
Wear approved eye protection while performing maintenance tasks such as
replacing components.
Be sure to also inform users of the following:
• Clean the chain and QUICK-LINK with an appropriate chain cleaner regularly. Intervals
between maintenance depend on the use and riding circumstances. Never use alkali
based or acid based solvents such as rust cleaners. If those solvents are used the chain or
QUICK-LINK might break and cause serious injury.
• Check the chain for any damage (deformation or cracking), skipping, or other
abnormalities such as unintended gear shifting. The chain may break, and you may fall. If
any problems are found, consult your place of purchase or a distributor.
When using TL-CT12:
• Be careful not to get injured by the blade or needle while working.
• Be careful not to get your fingers pinched by the tool while working.
• Keep the tool out of the reach of small children.
NOTICE
Be sure to also inform users of the following:
• For SHADOW RD+, be sure to check that the plate unit cover and the plate unit rubber
cap are installed before riding the bicycle.
• If gear shifting operation does not feel smooth, consult the place of purchase for
assistance.
• The gears should be periodically washed with a neutral detergent then lubricated. In
addition, cleaning the chain and QUICK-LINK with a neutral detergent and lubricating
them can be an effective way of extending the life of the chain and QUICK-LINK.
• Products are not guaranteed against natural wear and deterioration from normal use
and aging.
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TO ENSURE SAFETY
Shifting unit side
• For maximum performance we highly recommend SHIMANO lubricants and maintenance
products.
For installation to the bicycle, and maintenance:
• Depending on the shape of the frame, the rear derailleur may interfere with the
chainstay. Use the B-screw to adjust so that the rear derailleur does not interfere with
the chainstay.
• Grease with SIS SP41 grease (Y04180000) the inner cable and the sliding portions of the
outer casing before use to ensure that they slide properly. Do not let dust adhere to the
inner cable.
• To ensure smooth operation, use OT-RS900 outer casing for rear derailleur and a cable
guide.
• Use an outer casing which still has some length to spare even when the handlebars are
turned all the way to either side. Furthermore, check that the shifting lever does not
touch the bicycle frame when the handlebars are turned all the way.
• The end of the outer casing which has the sealed outer cap (aluminum type) should be
on the shifting unit side. Refer to the ST-RX810 dealer's manual for details.
Sealed outer cap
(aluminum type)
Cap with long tongue
• If gear shifting adjustments cannot be carried out, check the alignment of the dropout
and check if the cable is lubricated or if the outer casing is too long or too short.
• Periodically clean the shifting unit and lubricate all moving parts (mechanism and
pulleys).
• If you hear abnormal noise as a result of excess play in a pulley, you should replace the
pulley.
The actual product may differ from the illustration because this manual is
intended mainly to explain the procedures for using the product.
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List of tools to be used
List of tools to be used
The following tools are needed for installation/removal, adjustment, and maintenance
purposes.
Tool
2 mm hexagon wrench
3 mm hexagon wrench
4 mm hexagon wrench
5 mm hexagon wrench
5.5 mm spanner
Cross head screwdriver [#2]
TL-CT12
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Installation/removal
Installing the rear derailleur
Installation/removal
Installing the rear derailleur
TECH TIPS
• The rear derailleur will not gear shift properly if the derailleur hanger is not straight.
Use TL-RD11 to check whether the derailleur hanger is straight or not.
Standard type
1. Set the switch lever in the OFF position.
ON
OFF
Switch lever
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Installation/removal
Installing the rear derailleur
2. Tighten the rear derailleur fixing screw.
Be careful not to insert the rear derailleur fixing screw in the derailleur hanger at an
angle.
In addition, be sure to install the rear derailleur so that the stopper plate contacts the
B-tension stop, with no gap in between.
8 - 10 N·m
Rear derailleur fixing screw
B-tension stop
Stopper plate
NOTICE
• Periodically check to make sure that there is no gap between
the B-tension stop and the stopper plate. If there is a gap
between these two parts, problems with gear shifting
performance may occur.
Stopper plate
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Installation/removal
ON
Installing the rear derailleur
Direct mount type
1. Set the switch lever in the OFF position.
OFF
Switch lever
2. Remove the bracket axle plate.
RD-RX810/RD-RX812 RD-RX400
3. Install the rear derailleur.
(1) Insert the derailleur hanger into the installation part for direct mount of the rear
derailleur.
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Installation/removal
Installing the rear derailleur
(2) Install the rear derailleur with the B-axle2.
Derailleur hanger
(1)
8 - 10 N·m
(2)
B-axle2
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Adjustment
Adjusting the stroke on the high limit
Adjustment
Adjusting the stroke on the high limit
1. Adjust by turning the high limit screw.
Adjust so that the center of the guide pulley is aligned with the outer face of the smallest
sprocket when viewed from the rear side.
High limit screw
Smallest sprocket
Guide pulley
*
High limit screw
RD-RX810/ RD-RX812
RD-RX400
*
Installing the chain
Refer to the dealer's manual for the chain to find instructions on installing/removing the chain.
Checking the chain length
1. Mount the chain on the largest sprocket and the largest chainring.
Largest sprocket
Chain
Largest chainring
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Adjustment
Checking the chain length
2. Check the length of the chain.
Add 4 - 6 links to set the length of the chain as shown in the figure.
If the inner links and outer links match when mounting the chain
Add 4 or 6 links to set the length.
When setting the chain length with 4 links added, if you are concerned about turbulence
in the drivetrain components when the chain is on the largest sprocket and largest
chainring, set the chain length with 6 links added.
Inner link
+4 links or +6 links
Outer link
If the inner links match together and the outer links match together
Add 5 links to set the length.
+5 links
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Adjustment
Checking the chain length
NOTICE
• The rear derailleur plate assembly is equipped with a pin or plate that prevents
chain derailment. When passing the chain through the rear derailleur, pass it
through the main body of the rear derailleur from the side of the chain
derailment prevention plate as shown in the figure.
• If the chain is not passed through the correct position, damage may be caused to
the chain or the rear derailleur.
RD-RX810
Chain derailment prevention
plate
Chain derailment prevention
plate
RD-RX812/RD-RX400
Chain derailment prevention
plate
Chain derailment prevention
plate
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Adjustment
Connection and securing of the inner cable
Connection and securing of the inner cable
Outer casing length
1. Loosen the B-screw to the position shown in the figure.
Make sure that the stopper plate touches the bracket body without leaving a gap.
Stopper plate
Bracket body
B-screw
2. Determine the length of the outer casing.
Fit a sealed outer cap to the end of the outer casing. Align the end of the outer cap to
the bottom edge of the outer casing holder on the rear derailleur.
Make sure to leave enough slack in the outer casing.
Outer casing
Outer casing holder
Sealed outer cap (aluminum type)
NOTICE
• Make sure to use OT-RS900 for the outer casing.
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Adjustment
Connection and securing of the inner cable
3. Cut off any excess outer casing with the cable cutter.
Cut the end of the outer casing that is opposite to the marking.
Outer cap with tongue
4. Remove the outer cap with tongue from the cut outer casing.
5. Spread out the tip of the liner using a thin tool such as a TL-CT12
needle.
Arrange the cut end into a perfect circle.
TL-CT12 needle
NOTICE
• Be careful not to hurt your hands with the TL-CT12 needle.
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Adjustment
Sealed outer cap
Connection and securing of the inner cable
6. Install the cap with long tongue to the end.
The end of the outer casing which has the sealed outer cap (aluminum type) should be on
the shifting unit side.
Route the inner cable through the outer casing.
(aluminum type)
OT-RS900
Cap with long tongue
Connection and securing of the inner cable
1. Set the shifting lever in its initial position.
Operate the release lever 10 times or more.
2. Secure the inner cable to the rear derailleur.
There is no cover with tongue for RD-RX400.
Inner cable
Cover with
tongue
NOTICE
• When replacing the inner cable for RD-RX810/RD-RX812, it is recommended to
replace the cover with tongue.
• Cables with a polymer coating may develop a fuzzy appearance or texture
through natural wear when used. However, if the cables are installed with care
according to the procedures outlined in this manual, this is strictly cosmetic and
performance will not be affected where the inner cables are housed by outer
casing.
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Adjustment
Connection and securing of the inner cable
3. Remove the initial slack from the inner cable.
Hold the rear derailleur so that it won't move under load from the shift cable. Operate
the shifting lever several times in order to tension the shift cable assembly and fully seat
all the shift cable components.
4. Re-secure the inner cable to the rear derailleur.
While pulling the inner cable, be sure that it is securely in the cable fixing groove.
Inner cable
6 - 7 N·m
5. Cut the inner cable so that the protruding length is approximately 30
mm.
Install the inner end cap.
30 mm
Inner end cap
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Adjustment
Adjusting the stroke on the low limit
NOTICE
• Check that the inner cable does not interfere with the spokes of the wheel.
• Do not allow the wheel to turn while carrying out this step.
Adjusting the stroke on the low limit
1. Adjust by turning the low limit screw.
Adjust so that the center of the guide pulley is aligned with the center of the largest
sprocket.
Largest sprocket
Guide pulley
Low limit screw
Low limit screw*
RD-RX810/
RD-RX400
*
RD-RX812
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Adjustment
Smallest chainring
Largest sprocket
Adjusting the B-screw
Adjusting the B-screw
1. Shift the chain to the smallest chainring and the largest sprocket.
Turn the crank arm in reverse.
Largest sprocket
2. Adjust the B-screw.
Bring the guide pulley as close to the largest sprocket as possible without any turbulence
between the pulley and sprocket.
B-screw
Smallest sprocket
B-screw*
*
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Adjustment
SIS adjustment
3. Check that the chain has running clearance when it is in the smallest
rear sprocket.
If the chainstay and rear derailleur interfere, adjust by turning the B-screw until they do
not interfere.
If there is some slack in the chain, adjust the B-screw to remove the slack from the chain.
SIS adjustment
1. Set the switch lever in the OFF position.
ON
OFF
Switch lever
2. Operate the shifting lever once to shift to the 2nd sprocket counting
from the smallest sprocket.
3. Shift to the 2nd from the smallest sprocket. If using a 2x system, also
shift to the largest chainring.
4. Turn the cable adjustment barrel counterclockwise to add cable tension
until you can hear noise from the chain rubbing the 3rd smallest
sprocket.
Cable adjustment barrel
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Adjustment
SIS adjustment
5. Turn the cable adjustment barrel clockwise to reduce cable tension
until no noise is heard from the chain rubbing the sprocket.
Cable adjustment barrel
6. Return the shifting lever to its original position (the position of the 2nd
sprocket counting from the smallest sprocket, with your finger released
from the shifting lever), then turn the crank.
NOTICE
• If it is touching the 3rd sprocket counting from the smallest sprocket and making
noise, turn the cable adjustment barrel clockwise slightly to tighten it just
enough until the noise stops.
7. Operate the shifting lever to change gears while turning the crank, and
check that no noise occurs in any of the gear positions.
TECH TIPS
• The rear derailleur will not gear shift properly if the derailleur hanger is not
straight. Use TL-RD11 to check whether the derailleur hanger is straight or not.
8. Set the switch lever in the ON position and check that the gear shifting
is smooth, consistent, and that there is no noise in any of the gear
positions while riding the bicycle.
If gear shifting from the largest sprocket becomes slow with the switch lever in the ON
position, adjust the guide pulley slightly further away by turning the B-screw.
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Maintenance
Replacing the pulleys
Maintenance
Replacing the pulleys
1. Replace the guide pulley and tension pulley.
Check the arrow direction on the pulley when installing it.
For RD-RX400, the pulley can be installed in any direction.
RD-RX810/RD-RX812 RD-RX400
Guide pulley
Guide pulley
2.5 - 5 N·m
RD-RX810/RD-RX812 RD-RX400
Tension pulley
2.5 - 5 N·m
2.5 - 5 N·m
Tension pulley
2.5 - 5 N·m
NOTICE
• The pulley for RD-RX810/RD-RX812 has an arrow on it to indicate the direction of
rotation. Install so that the guide pulley moves clockwise and the tension pulley
moves counterclockwise when viewed from the inner side of the shifting unit.
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Maintenance
ON
Applying grease to the chain stabilizer
Applying grease to the chain stabilizer
If there is a noticeable change in friction in the chain stabilizer assembly, or if it starts to make
noise, you may need to add grease to the chain stabilizer.
* When assembling, reverse the procedure.
1. Set the switch lever in the OFF position.
OFF
Switch lever
2. Remove the plate unit cover.
Plate unit cover
3. Remove the chain stabilizer and cam unit together.
Chain
stabilizer
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Maintenance
Adjusting friction
4. Apply the dedicated grease to the outer diameter of the roller clutch.
SHADOW RD+ Grease number:
Y04121000 (50 g)
NEXUS Grease number: Y04120800
(100 g)
Roller clutch
NOTICE
• Be careful not to get grease inside the roller clutch. Otherwise, the clutch could
stick, slip, or otherwise malfunction.
Adjusting friction
The level of friction can be adjusted as desired. Furthermore, the friction can also be adjusted
when it changes during use.
1. Set the switch lever in the OFF position.
ON
OFF
Switch lever
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Maintenance
RD-RX810
Adjusting friction
2. Use a 2 mm hexagon wrench to remove the plate unit cover.
Plate unit cover
3. Turn the friction adjustment screw to adjust the friction.
IncreaseDecrease
Friction adjustment screw
RD-RX812/RD-RX400
IncreaseDecrease
Friction adjustment screw
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Maintenance
Switch lever
Adjusting friction
4. Check the friction torque.
Use your finger to hold the cam unit securely in place, then set the switch lever to the ON
position.
Insert a 4 mm hexagon wrench into the chain stabilizer and check the friction torque.
ON
Cam unit
Chain stabilizer
NOTICE
• If adjusting the friction once more, be sure to set the switch lever to the OFF
position while pressing the cam unit with your finger before making the
adjustment.
5. Set the switch lever in the OFF position.
Set the switch lever to the OFF position while pressing the
cam unit with your finger. At that time, make sure that
the cam unit is in contact with the bottom of the plate
unit.
3 - 4.9 N·m
2.6 - 4.2 N·m
(RD-RX810/RD-RX400)
(RD-RX812)
OFF
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Maintenance
Plate unit cover
Adjusting friction
NOTICE
• Do not install the plate unit cover if the plate unit is not fully seated against the
switch base. This may result in insufficient sealing, which can lead to corrosion
and malfunction of the chain stabilizer assembly.
6. Install the plate unit cover.
1 - 1.5 N·m
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Maintenance
ON
Replacement of the plate and the plate tension spring
Replacement of the plate and the plate
tension spring
Removal
1. Set the switch lever in the OFF position.
OFF
Switch lever
NOTICE
• If operating the switch lever while the plate unit cover is removed, hold the cam
unit down with your finger so that it does not slide out.
2. Remove the plate stopper pin with a cross head screwdriver.
Plate stopper pin
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Maintenance
Replacement of the plate and the plate tension spring
NOTICE
• Hold the plate and rear derailleur body firmly when working, as there is spring
tension applied to the plate.
3. Turn the plate to loosen the plate tension spring.
As shown in the figure, squeeze the outer casing holder and cable attachment portion
together to move the link and turn the plate.
Link
Cable attachment portion
Outer casing holder
4. Remove the plate unit cover screws.
Plate unit cover screw
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Maintenance
Replacement of the plate and the plate tension spring
5. Remove the plate unit cover.
Plate unit cover
6. Remove the chain stabilizer and cam unit.
Cam unit
Chain stabilizer
7. Remove the plate axle.
Plate axle
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Maintenance
Replacement of the plate and the plate tension spring
Installation
Perform the installation in the reverse order from the removal procedure.
1. Apply the dedicated grease to the plate axle.
Plate axle
Grease application area
Grease number: Premium Grease
(Y04110000)
NOTICE
• Do not apply grease outside of the application area indicated above. If grease is
applied here, it will get inside the roller clutch and friction will be lost.
2. Insert the plate axle, then fit the tip of the plate tension spring in the
hole of the plate.
RD-RX810
Plate tension spring
Plate axle
Plate
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8 - 10 N·m
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Maintenance
Replacement of the plate and the plate tension spring
RD-RX812
Plate tension spring
Plate axle
RD-RX400
Plate
8 - 10 N·m
Plate tension spring
Plate axle
Plate
8 - 10 N·m
3. Check that the switch lever is in the OFF position.
If the switch lever is in the ON position, be sure to set it to the OFF position.
Switch lever
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Maintenance
Cam unit
Replacement of the plate and the plate tension spring
4. Set the chain stabilizer into the cam unit as shown in the figure.
Check that the cam lobe of the cam unit is in the position shown in the figure.
Chain stabilizer
Cam lobe
NOTICE
• Ensure the cam unit is installed with the cam lobe in the
correct position. Do not install it in the position shown
in this figure.
Cam lobe
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Maintenance
Replacement of the plate and the plate tension spring
5. Install the cam unit and chain stabilizer.
Pay attention to the positioning of the cam lobe of the cam unit.
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Maintenance
Plate
Replacement of the plate and the plate tension spring
TECH TIPS
• When installing, it helps to move the
plate back and forth while pushing on
the cam unit and chain stabilizer.
• If there is resistance when moving the
switch lever to the ON position, the
components are installed correctly. If
there is no resistance, check the position
of the cam lobe of the cam unit then
reinstall the components.
6. Install the plate unit cover gasket.
Check that it is installed along the groove in the plate unit.
Plate unit cover gasket
Switch lever
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Maintenance
Replacement of the plate and the plate tension spring
7. Install the plate unit cover screws.
1 - 1.5 N·m
Plate unit cover screw
8. Twist the plate, install the plate stopper pin.
Plate
1 N·m
Plate stopper pin
NOTICE
• Hold the plate and rear derailleur body firmly when working, as there is spring
tension applied to the plate.
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Please note: specifications are subject to change for improvement without notice. (English)
© Dec. 2020 by SHIMANO INC. ITP
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