Page 1
7
12, 14, 16, 18, 21, 26, 32T
12, 14, 16, 18, 21, 24, 28T
6Gears
14, 16, 18, 20, 22, 24, 34T
14, 16, 18, 20, 22, 24, 28T
14, 16, 18, 21, 24, 34T
14, 16, 18, 21, 24, 28T
Tooth combination (MF)
Tooth combination
(CS-HG20-7)
RD-TX75
SGS
7 / 6
43T
28-34T
11T
20T
RD-TX55
SGS
7 / 6
43T
28-34T
11T
20T
RD-TX35
SGS
7 / 6
43T
28-34T
11T
20T
RD-TZ50
GS
6
34T
28T
14T
20T
GS
6
34T
28T
14T
20T
SS
6
28T
28T
14T
13T
RD-TY18Model number
Type
Gears
Total capacity
Rear largest sprocket
Rear smallest sprocket
Front chainwheel tooth difference
SL-RS36-6
SIS 6-gears
SL-RS36-7
SIS 7-gears
Model number
Gears
Technical Service Instructions
WARNING
“Maintenance interval depends on the usage and riding circumstances. Clean regularly the
chain with an appropriate chaincleaner. Never use alkali based or acid based solvents such as
rust cleaners. If those solvent be used chain might break and cause serious injury.”
• Use the reinforced connecting pin only for connecting the narrow type of chain.
• There are two different types of reinforced connecting pins available. Be sure to check the table below before selecting
which pin to use. If connecting pins other than reinforced connecting pins are used, or if a reinforced connecting pin or tool
which is not suitable for the type of chain is used, sufficient connection force may not be obtained, which could cause the
chain to break or fall off.
• If it is necessary to adjust the length of the chain due to a change in the number of sprocket
teeth, make the cut at some other place than the place where the chain has been joined
using a reinforced connecting pin or an end pin. The chain will be damaged if it is cut at a
place where it has been joined with a reinforced connecting pin or an end pin.
• Check that the tension of the chain is correct and that the chain is not damaged. If the
tension is too weak or the chain is damaged, the chain should be replaced. If this is not
done, the chain may break and cause serious injury.
• Check that the wheels are fastened securely before riding the bicycle. If the wheels are loose in any way, they may come
off the bicycle and serious injury may result.
• Obtain and read the service instructions carefully prior to installing the parts. Loose, worn or damaged parts may cause
the bicycle to fall over and serious injury may occur as a result. We strongly recommend only using genuine Shimano
replacement parts.
• Obtain and read the service instructions carefully prior to installing the parts. If adjustments are not carried out
correctly, the chain may come off and this may cause you to fall off the bicycle which could result in serious injury.
• Read these Technical Service Instructions carefully, and keep them in a safe place for later reference.
Note
• The reinforced connecting pins cannot be used with the UG chain, otherwise the connections will not move properly and
noise will occur.
• If gear shifting operations do not feel smooth, wash the derailleur and lubricate all moving parts.
• If the amount of looseness in the links is so great that adjustment is not possible, you should replace the derailleur.
• You should periodically clean the derailleur and lubricate all moving parts (mechanism and pulleys).
• If gear shifting adjustment cannot be carried out, check the degree of parallelism at the rear end of the bicycle. Also check
if the cable is lubricated and if the outer casing is too long or too short.
• If you hear abnormal noise as a result of looseness in a pulley, you should replace the pulley.
• If the wheel becomes stiff and difficult to turn, you should lubricate it with grease.
• Do not apply any oil to the inside of the hub, otherwise the grease will come out.
• You should periodically wash the sprockets in a neutral detergent and then lubricate them again. In addition, cleaning the
chain with neutral detergent and lubricating it can be a effective way of extending the useful life of the sprockets and the
chain.
• If the chain keeps coming off the sprockets during use, replace the sprockets and the chain.
• Use an outer casing which still has some length to spare even when the handlebars are turned all the way to both sides.
Furthermore, check that the shifting lever does not touch the bicycle frame when the handlebars are turned all the way.
• Grease the inner cable and the inside of the outer casing before use to ensure that they slide properly.
• Use a frame with internal cable routing is strongly discouraged as it has tendencies to impair the SIS shifting function due
to its high cable resistance.
• Operation of the levers related to gear shifting should be made only when the front chainwheel is turning.
• For smooth operation, use the specified outer casing and bottom bracket cable guide.
• To ensure the best performance, be sure to use only the specified type of chain. The wide type chain cannot be used.
• For maximum performance we highly recommend Shimano lubricants and maintenance products.
• Parts are not guaranteed against natural wear or deterioration resulting from normal use.
• For any questions regarding methods of installation, adjustment, maintenance or operation, please contact a professional
bicycle dealer.
Chain toolChain
9-speed super narrow chain
such as
CN-7701 / CN-HG93
8- / 7- / 6-speed narrow
chain such as
CN-HG50 / CN-HG40
Reinforced
connecting pin
TL-CN32 /TL-CN27
TL-CN32 /TL-CN27
6.5mm
7.1mm
Silver
Black
Reinforced Connecting Pin
End Pin Link Pin
Series
Gears
Shifting lever (Right)
Chain
Bottom bracket cable guide
Rear derailleur
Outer casing
Freewheel
Tourney (MEGARANGE) Tourney (SIS)
7-gears
SL-RS36-7R
CN-UG51 / CN-HG40
SM-SP18
RD-TX75/
RD-TX55/
RD-TX35
OT-SIS40
MF-TZ31/
MF-TZ31-CP
6-gears
SL-RS36-6R
RD-TX75/
RD-TX55/
RD-TX35
MF-TZ30/
MF-TZ30-CP
In order to realize the best performance, we recommend that the following combination be used.
7-gears
SL-RS36-7R
CN-UG51 / CN-HG40
SM-SP18
RD-TX75/
RD-TX55/
RD-TX35
OT-SIS40
MF-HG37/MF-TZ21/
MF-TZ21-CP/
CS-HG20-7
6-gears
SL-RS36-6R
RD-TX75/RD-TX55/
RD-TX35/RD-TZ50/
RD-TY21/RD-TY18
MF-TZ20/
MF-TZ20-CP
Specifications Cable securing and stroke adjustment
SIS Adjustment
Shifting lever
Rear derailleur
GS
6
34T
28T
14T
20T
SS
6
28T
28T
14T
13T
RD-TY21
Sprocket tooth configurations
bp
bm
Mounting the shifting lever Gear shifting operation
Tightening torque:
2.6 N·m {23 in. lbs.}
Handlebar
Pedaling becomes
heavier
Pedaling becomes
lighter
3 mm Allen Key
Half grip
Install the brake lever in a position where it will not obstruct brake
operation. Do not use in a combination which causes brake
operation to be obstructed.
Leave a gap of 0.5 mm between
the Revo-shift lever and the half grip.
Tightening torque:
8 - 10 N·m
{70 - 86 in. lbs.}
Installation of the rear derailleur
Installation of the freewheel
Direct-mount type
< MF >
< CS-HG20-7 >
< GS, SGS >
5 mm Allen Key
Frame
Bracket
Push in and tighten
Freewheel removal tool
TL-FW30
Tightening torque:
3 - 4 N·m
{26 - 34 in. lbs.}
Bracket type
Bracket nut
Bracket bolt
Tightening torque:
30 N·m {260 in. lbs.}
To install
To disassemble
Chain length
Add 2 links (with the chain on
both the largest sprocket and
the largest chainring)
Largest
sprocket
Largest
chainring
Chain
Chain
< SS >
Smallest
sprocket
Largest
chainring
Guide pulley
Tension pulley 90°
Right angle to the ground
< RD-TX75 / RD-TX55 >
Place the outer casing so that it does not touch the basket and
mudguard, otherwise it may cause a problem with the performance
of the derailleur.
Set the outer casing (RD-TX75/RD-TX55) so that its length is as
follows.
Connect the inner cable to the
derailleur as shown in the illustration.
• If routing the casing upward:
(The chain should be on the largest chainring and
on the largest sprocket.)
Add 10 mm to the length of the outer casing from
the end that is inserted into the outer casing holder
to the end which is inserted into the link.
• If routing the casing downward:
(The chain should be on the largest chainring and on the largest
sprocket.)
Set the length of the outer casing so that it describes a smooth
arc, and so that the link stops in a position where there is a small
gap between the link and the link stop.
L
Chain position
Largest
sprocket
Largest
chainring
Chain position
Largest
sprocket
Largest
chainring
Outer casing
holder
Link
max.
angle
max.
angle
Link
Link stop
Inner cable
1. Top adjustment
Turn the top adjustment screw to adjust so that the guide pulley is
below the outer line of the smallest sprocket when looking from the
rear. After this, install the chain.
2. Connection and securing of cable
Connect the cable to the rear derailleur and, after taking up the initial
slack in the cable, reattach to the rear derailleur as shown in the
illustration.
Secure the cable by pulling it with pliers with a force of 5 - 10 kg.
3. Low adjustment
While turning the front chainwheel, operate the lever to shift to the lowest gear.
Turn the low adjustment screw so that the guide pulley moves to a position directly below
the largest sprocket.
4. How to use the B-tension adjustment screw
< RD-TX75 / RD-TX55 / RD-TX35 >
Mount the chain on the smallest chainring and the
largest sprocket, and turn the crank arm backward.
Then turn the B-tension adjustment screw to adjust
the guide pulley as close to the sprocket as
possible but not so close that it touches. Next, set
the chain to the smallest sprocket and repeat the
above to make sure that the chain tension is
correct.
< RD-TZ50 >
In order to obtain suitable gear shifting
performance, set the chain onto the smallest
chainring and the largest sprocket. Then turn the B-tension adjustment screw to adjust so
that the distance between the tip of the freewheel and the tip of the guide pulley is about
10 mm. Next, set the chain onto the smallest sprocket and repeat the above to make sure
that the chain tension is correct.
Operate the shifting lever several times to move the chain to the 2nd
sprocket. Then, while pressing the lever just enough to take up the
play in the lever, turn the crank arm.
1 2
1
2
Top adjustment
screw
RD-TX75 / TX55 / TX35
RD-TZ50
RD-TY18
Outer line of
smallest sprocket
Guide pulley
Tightening torque:
5 - 7 N·m {44 - 60 in. lbs.}
Groove
RD-TY21
Pull
Note:
Be sure that the cable is
securely in the groove.
Cutting the outer casing
When cutting the outer casing, cut the opposite
end to the end with the marking. After cutting the
outer casing, make the end round so that the
inside of the hole has a uniform diameter.
Inserting the inner cable
Insert the inner cable into the outer casing from the end with the
marking on it. Apply grease from the
end with the marking in order to
maintain cable operating efficiency.
Attach the same outer end
cap to the cut end of the
outer casing.
Outer end cap
Marking
1
2
1 2
Low adjustment
screw
RD-TX75 / TX55 / TX35
RD-TZ50
RD-TY18
Largest
sprocket
Guide pulley
Replacing the inner cable
1. Operate the shifter to set it to the top position. Loosen
the screws at point A and B with a screw driver in order
to remove the cover.
2. Replace the inner cable by carrying out steps 1 to 3 as
shown in the illustrations.
Largest sprocket Smallest sprocket
B-tension
adjustment screw
Play
When shifting to 3rd When no sound at all is
heard
For the best SIS performance, periodically lubricate all power-transmission parts.
Tighten the outer cable adjusting barrel
until the chain returns to the 2nd sprocket.
(clockwise)
Loosen the outer casing adjustment barrel
until the chain touches the 3rd sprocket
and makes noise. (counter clockwise)
adjustment
barrel
RD-TX75/55
RD-TX35/TZ50/TY21
Best setting
The best setting is when the shifting lever is operated just enough to take
up the play and the chain touches the 3rd sprocket and makes noise.
* Return the lever to its original position (the position where the lever is at
the 2nd sprocket setting and it has been released) and then turn the
crank arm clockwise. If the chain is touching the 3rd sprocket and making
noise, turn the outer casing adjustment barrel clockwise slightly to tighten
it until the noise stops and the chain runs smoothly.
Operate lever to change gears, and check that no noise occurs in any of the gear
positions.
adjustment
barrel
RD-TX75/55
RD-TX35/TZ50/TY21
1
2
3
Rear Drive System
SI-6VJRA-002-00
One Holland, Irvine, California 92618, U.S.A. Phone: +1-949-951-5003 Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: +31-341-272222 3-77 Oimatsu-cho, Sakai-ku, Sakai-shi, Osaka 590-8577, Japan
This service instruction explains how to use and maintain the Shimano bicycle parts which have been used on your new
bicycle. For any questions regarding your bicycle or other matters which are not related to Shimano parts, please contact
the place of purchase or the bicycle manufacturer.
Do not use RD-TZ50-GS for bicycles with small wheels having a diameter of 20 inches or less, otherwise the rear
derailleur may touch the wheel or the road surface.
A
B
RD-TY21
Tightening torque:
30 - 50 N·m {261 - 434 in. lbs.}
Lock ring
Tool
(TL-SR21)
Disassembly
Assembly
TL-LR15 / LR10
TL-LR15 / LR10
For each sprocket, the surface that
has the group mark should face
outward and be positioned so that
the triangle (
U) mark on each
sprocket and the A part (where the
groove width is wide) of the
freewheel body are aligned.
The groove is wide at one place
only.
a
c
-
1
4
T
A
U mark
For installation of the HG
sprockets, use the special tool
(TL-LR15 / LR10) to tighten the
lock ring.
To replace the HG sprockets, use
the special tool (TL-LR15 / LR10)
and TL-SR21 to remove the lock
ring.
General Safety Information
SI-6VJRA-002
* Service Instructions in further languages are available at : http://techdocs.shimano.com
Please note:
specifications are subject to change for improvement without notice. (English) © Sep. 2024 by SHIMANO INC. ITP
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