Shimano BL-4600, CN-4601, CN-5600, CS-4600, FC-4600 Service Instructions

Installation to the handlebar

Secure the assembly with the
installation nut on the outside
of the bracket. Pull the bracket
cover back and use a 5 mm
Allen key to tighten the bolt.

WARNING

• 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.

• Use the ST-4600/4603, BL-4600/R780 with the BR-4600. Do not use the BR-4600 in
combination with previous STI levers for road riding or with the BL-R770/BL-R550 brake
levers for flat handlebars, otherwise the braking performance provided will be much too
strong.

• Read these Technical Service Instructions carefully, and keep them in a safe place for
later reference.

Note

• For triple front chainwheel specifications, be sure to read these Service Instructions in
conjunction with the Service Instructions for the ST-4603 and FD-4603.

• 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 the bottom bracket cable guide.

• Grease the inner cable and the inside of the outer casing before use to ensure that they
slide properly.

• Because the high cable resistance of a frame with internal cable routing would impair the
SIS function, this type of frame should not be used.

• A special grease is used for the gear shifting cable. Do not use DURA-ACE grease or
other types of grease, otherwise they may cause deterioration in gear shifting
performance.

• Parts are not guaranteed against natural wear or deterioration resulting from normal use.

• For maximum performance we highly recommend Shimano lubricants and maintenance
products.

• For any questions regarding methods of installation, adjustment, maintenance or
operation, please contact a professional bicycle dealer.

SI-6UM0A-002-00

Note when using the reach adjustment block (Pad spacer)

When installing the 8-degree reach adjustment block, use an anatomic-type handlebar.
If a round-type handlebar is used, the cable stroke may become too short and this can
result in insufficient braking force.

Round typeAnatomic type

Series

Shifting lever

Brake lever

Dual control lever

Outer casing

Gears

Front derailleur

Front chainwheel

Bottom bracket

Rear derailleur

Freehub

Cassette sprocket

Chain

Bottom bracket cable guide

TIAGRA

ST-4600 (Double) ST-4603 (Triple)

Rear

Front

ST-4600

20

FH-4600

CS-4600

CN-4601 CN-5600

FD-4600

FC-4600 / 4650

RD-4600-SS

SM-SP17

30

FD-4603

FC-4603

RD-4600-GS

OT-SP41

SM-FC4500

SL-4600 SL-4603

BL-4600

In order to realize the best performance, we recommend that the following
combination be used.

Operation

Lever B

F

Lever AF: Shifts from smaller to larger rear sprocket.
Lever

B

F

: Shifts from larger to smaller rear sprocket.

Lever aF: Shifts from smaller to larger chainring.
Lever bF: Shifts from larger to smaller chainring.

Rear Front

Lever AF

Lever

b

F

Lever aF

All levers return to the starting position when released.

If the cable hook does not align with the shifting cable hole, press
lever

b again until it does, and then install the cable.

Make sure that the inner end is firmly seated in the cable hook.

The adjustment margin for the
cable adjuster is five turns from
its fully-tightened position.
The initial condition is loosened
by one turn from the fully­tightened position.

Reassembling without a cable adjuster (cap sold
separately)
* When using an outer stopper

Disassemble the cable adjuster as shown in the illustration.

* Insert a thin bar-shaped object to remove the outer casing holder

spacer.

Install the outer casing holder cap (sold separately).

Be sure to read these service instructions in conjunction with
the service instructions for the RD-4600, FD-4600 / 4603
before use.

• Lever AF : Shifts from smaller to larger rear sprocket.
Lever

AF has a click stop at positions ⁄ and ¤.

Operation of rear derailleur lever

Lever AF

lever AF

start position

¤ Click

⁄ Click

4 3

35

⁄ : Shifts one sprocket

E.x. : from 3rd to 4th

¤ : Quick-shifts two sprockets

E.x. : from 3rd to 5th

Caution on operation

Lever Bb will also move when lever Aa is operated,
but be careful not to apply pressure to lever Bb.
Similarly be careful not to press lever Aa when
operating lever Bb. Gears will not shift when both
levers are pressed simultaneously.

• Lever BF: Shifts from larger to smaller rear sprocket.
Press lever

B

F

once to shift from a larger to one smaller

sprocket.

Lever B

F

lever BF

start position

34

E.x. : from 4th to 3rd

Operation of front derailleur levers

(FD-4600 / 4603)

• Lever

a

F : Shifts from smaller to larger front chainring.

Lever a

F

Lever a

F

start position

If operation of lever a does not
complete the chainring shift stroke,
operate lever a again for the
distance (X') to complete that part
of the lever stroke (X) which was
short.

Full gear shift stroke

Actual stroke

• Lever

b

F : Shifts from larger to smaller front chainring.

< FD-4600, ST-4600 > < FD-4603, ST-4603 >

Lever b

F

Lever b

F

start position

When lever b is operated, there is one click where
trimming (the noise prevention mechanism) engages, and
a second stronger click when the
gear shift stroke is completed.
After trimming, the next push will
complete the gear shift stroke.

Gear shift

complete stroke

Click

Click

Trim
operation

• Lever

b

F : Shifts from largest chainring to intermediate

chainring.

Lever b

F

• Lever

b

F : Shifts from intermediate chainring to smallest

chainring.

Gear shift

complete stroke

Click

Click

Gear shift

complete stroke

Click

Click

Trimming (noise prevention operation)

If the chain is on the large or intermediate chainring and
the largest rear sprocket, the chain will rub on the front
derailleur inner plate, producing a characteristic noise.
When this happens, press lever b slightly (to the point
where it clicks); this causes the front derailleur to move
slightly toward the smaller chainring, thereby eliminating
the noise.

If the front derailleur outer plate and the chain come into
contact and generate noise when the chain is on the
smallest or intermediate chainring and on one of the
smaller sprockets, press lever a slightly to move the front
derailleur slightly toward the largest chainring in order to
eliminate the noise.

Chain position

Movement of the front
derailleur

Cable used

• Inner cable • • • • • • • • • • • • • • • • • • •

• SLR outer casing • • • • • • • • • • • • • • •

Note: The front lever cannot be tilted to

the inside until lever b

F

is pushed

once or twice.

Installation

Installation of the brake cable

Be sure to leave some excess cable, even if cutting it to the full length
of the handlebars.

1. Tilt the lever in (as when shifting) to make it easier to pass the

cable through the cable hook.

Lever b

F

2. Pass the inner cable through.

Inner cable

Cable hook

Note: Do not wipe the grease on the inner cable off.

Also, be careful that the inner cable does not pick up dust
and foreign matter.

3. Finally, wrap the handlebar with the finish tape.

Operate lever

F

B 9 or more times
to set the lever to the highest
position, check on the indicator
that the highest position is correct,
and then install and adjust the
inner cable.

• Rear lever

Lever

B

F

Operate at
least 9 times

Depress the brake lever, and then pass
the inner cable through the cable hole.

Inner cable

Cable hole

If the cable hook does not align with the shifting cable hole, press
lever B

F

again until it does, and then install the cable.

Cable hook

Make sure that the inner end is firmly seated in the cable hook.

Cable hook

Inner end

• Front lever

Operate at least 2 - 3 times

Depress the brake lever, and then
pass the inner cable through the
cable hole.

Outer casing

Cable hole

Inner cable

Replacing the bracket cover

The tabs on the bracket cover each fit to a matching slot on the
bracket.

Note the markings:
R : for right
L : for left

Wipe a little rubbing alcohol
inside the bracket cover to
make installation easier.

Pull

Tilt

Bracket cover

5 mm Allen key

Installation nut

1

2

Wire lead

f

1.6 mm

f

5 mm

Tightening torque:

6 - 8 N·m {50 - 70 in. lbs.}

Installing the shifting cable

Cable used

• Inner cable (stainless steel)

• SP41 sealed outer casing (1)

• SP41 outer casing (2)

SEALED

SP41

SP41

f

1.2 mm

f

4 mm

f

4 mm

Lever

b

F

Cable hook

Inner end

Operate lever bF2 or more times, check on
the indicator that the low position is correct,
and then secure the inner cable.

Attach the same outer end cap to the cut end of the outer casing.

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.

SP41

SP41

Outer end cap

2. Align the stud holes, and then set the special tool (1) in the

position shown in the illustration to press-fit the lever stud.

Assembling the bracket body and lever
body

1.

Maintenance

* The illustration shows the right-hand lever.

Bracket and lever disassembly

1. First use the special tool (sold separately) to remove the E-ring.

Use part (B) of the special tool (2) to align the E-ring with the
direction of removal. Next, set part (A) against the E-ring and
remove the E-ring.

3. Remove the special tool (1), and

then use the special tool (2) to
install the E-ring.

2. Insert an Allen key or similar tool into the

lever stud hole, and then tap it gently with
a plastic mallet to push out the lever stud.
When the lever stud comes out, the
bracket body and lever body can be
disassembled.

Special E-ring removal tool

Y6RT66000

Y6RT68000

Lever body

Bracket
body

Lever stud

When removing the E-ring, it may
suddenly spring out, so check the
safety of any nearby people or
objects before removing it.

• The correct direction for the lever stud to face is with the E-ring
groove at the top.

• Check that the surface of the bracket body is flush with the top
of the lever stud to ensure that the E-ring can fit into the
groove.

CAUTION

Notch

Return spring

(2)(1)

(A)

(B)

E-ring removal direction

E-ring

Always be sure to remove
the lever stud in this
direction. If it is removed in
the opposite direction, it
may damage the bracket
body.

E-ring groove

Outer casing adjustment plate

Outer casing holder spacer

Outer casing adjustment spring

Outer casing adjustment bolt

Outer casing holder cap (sold separately)

Cable adjustment
base

One Holland, Irvine, California 92618, U.S.A. Phone: [phone]

Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: [phone]

3-77 Oimatsu-cho, Sakai-ku, Sakai-shi, Osaka 590-8577, Japan

Technical Service Instructions

ST-4600

Shimano Total Integration

7.5 mm

Initial condition:
4º

4º

8º

14 mm

To increase the lever
stroke

Remove the pad spacer
(A) and install the bump
rubber.

To decrease the lever
stroke

Insert pad spacer (B) as
far as it will go and so
that the projections fit into
the holes in pad spacer
(A).

* Apply a small amount of grease to the projections

when installing the pad spacer and the bump rubber.

Lever stroke adjustment

Pad spacers (A)

Pad spacers (A)

Pad spacers (A)

Pad spacers (B)

Bump rubber

Pad spacers (A) + (B)

Make sure that the inner
end is firmly seated in the
cable hook.

Cable hook

Inner end

• Cable adjuster

Loosen

(Cable stretches)

Tighten

3

6

‹ : Quick-shifts three sprockets

E.x. : from 3rd to 6th

Disassembly

General Safety Information

* 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

SI-6UM0A-002