Largest sprocket
3. Low adjustment
SERVICE INSTRUCTIONS SI-R611A
Installation of the sprockets
Turn the low adjustment screw
so that the guide pulley moves
Guide pulley
" For installation of the sprockets,
to a position directly in line with
For each sprocket, the
use the special tool (TL-HG16) to tighten
surface that has the group the largest sprocket.
the lock ring.
mark should face outward
1 2
and be positioned so that
Rear Drive System
Low adjustment
Tightening torque:
the triangle (U) mark on
2 1
screw
30 - 50 Nm {261 - 434 in. lbs.}
each sprocket and the A
part (where the groove width
" To replace the Lock ring
4. How to use the B-tension
is wide) of the freewheel
sprockets, use the Tool Largest Smallest
body are aligned. adjustment screw
Before use, read these instructions carefully, and follow them for correct use.
(TL-SR20) sprocket sprocket
special tool (TL-HG16)
Mount the chain on the smallest
A
The groove is wide and TL-SR20 to remove
2
chainring and the largest sprocket, and
at one place only.
In order to realize the best performance, we recommend that the the lock ring. 2
turn the crank arm
The 6 sprockets are secured by
following combination be used. Sprocket spacers Lock ring
backward. Then turn the
means of rivets. (1.0mm) TL-HG16
U mark
EZ-fire Plus ST-EF28-8 B-tension adjustment screw to adjust
the guide pulley as close to the
Outer casing SP40
1 2
sprocket as possible but not so close
Rear derailleur RD-MC18 Disassembly
that it touches. Next, set the chain to 1
B-tension
ajustment screw
the smallest sprocket and repeat the
Type SGS
1
above to make sure that the pulley
Freehub FH-MC18 / FH-R080
does not touch the sprocket.
Installation of the rear derailleur Adjustment
Gears 8
Outer line of
When installing, be careful that deformation is not caused by the B-tension
1. Top adjustment
Cassette sprocket CS-HG50-8I smallest sprocket
5. SIS Adjustment
3rd 2nd Top
adjustment screw coming into contact with the dropout tab.
Turn the top adjustment screw to
(1) Operate the shifting lever to move the
1
Chain CN-IG51 / CN-IG31 2
adjust so that the guide pulley is in
chain from the top gear to the 2nd gear.
Bracket spindle tightening torque:
line with the outer line of the
Bottom bracket cable guide SM-SP17 / SM-BT17 / SM-SP18 / SM-BT18
Outer casing
5 mm Allen key
8 - 10 Nm {70 - 86 in. lbs.} * If the chain will not move to the 2nd
smallest sprocket when looking adjustment barrel
gear, turn the outer casing adjustment
from the rear.
1 2
barrel to increase the tension ----- �'
B-tension adjustment
Guide pulley
screw
(counter clockwise)
Top adjustment
Specifications
screw
* If the chain moves past the 2nd gear,
decrease the tension --- �' (clockwise)
Rear Derailleur
Model number RD-MC18
2. Connection and securing of the cable
Remove the two indicator fixing screws which are
Gears 8 Dropout tab
�' �'
securing the indicator, and then remove the indicator unit
Total capacity 39T
as shown in the illustration.
Largest sprocket 30T Operate lever (B) 8 or more times to set the lever to the
Chain length highest position. Pass the inner cable through the lever
(2) Next with the chain on the 2nd
Smallest sprocket 11T
hole and hook it onto the lever, and then secure the Counter-
gear, increase the inner cable
7
Front chainwheel tooth difference 20T clockwise �'
Add 2 links (with the chain on both the
indicator unit with the two indicator fixing screws.
tension �' while turning the
Largest sprocket Largest chainring
largest sprocket and the largest chainring)
crank arm forward. Stop turning
Applicable front chainwheel FC-MC18
Set the indicator to position "8", and
(chainring tooth configuration) (42T-32T-22T) the outer casing adjustment
then assemble so that the indicator
Indicator fixing screws
barrel just before the chain
Clockwise �'
pins fit into the reel unit holes.
makes noise against the 3rd
Cassette sprocket tooth combination Chain
gear. Outer casing
adjustment barrel
This completes the adjustment.
Gears Group name Tooth combination
7
Reel unit hole
8 an 11, 13, 15, 17, 20, 23, 26, 30T
Checking the chain connection
Chain gauge
Indicator
For IG, chains, insert the chain gauge TL-CN24
For the best SIS performance, periodically lubricate
(TL-CN24) into the inner link which is next
all power-transmission parts.
Freehub
to the chain connecting pin to check that
the inner link width is correct.
Model number FH-MC18 / FH-R080
2.38mm
Check that the connecting pin pro-trudes
Inner cable Lever (B)
Gears 8 Connecting pin
past the outer link by the same amount on
both sides, and that the amount of
No. of spoke holes 36 / 32
Installation of the brake lever
Tightening torque:
Inner link
protrusion is 0.2 mm or more.
0.3 - 0.5 Nm {3 - 4 in. lbs.}
A B
Use a handlebar grip with a maximum
A, B Q 0.2mm
outer diameter of 32 mm.
Note
* Always be sure to use the sprocket set
Connect the cable to the rear derailleur and, after taking up the initial slack in
Group marks
Connecting pin
bearing the same group marks. Never use in
the cable, re-secure to the front derailleur as shown in the illustration.
Tightening torque:
combination with a sprocket bearing a different
6 - 8 Nm {53 - 69 in. lbs.}
Note: Be sure to secure the inner
group mark.
Correct Incorrect
Outer link
cable as shown in the
* Because the high cable resistance of a frame
illustration below.
with internal cable routing would impair the
SIS function, this type of frame should not be Inner cable
Pull
used.
Replacement of the freewheel body
5 mm Allen key
* Use an outer casing which still has some
length to spare even when the handlebars are After removing the hub axle, remove
FH-MC18
turned all the way to both sides. Furthermore, the freewheel body fixing bolt
Freewheel body Freewheel body fixing bolt
check that the shifting lever does not touch the (inside the freewheel body), and Tightening torque:
5 - 7 Nm {44 - 60 in. lbs.}
bicycle frame when the handlebars are turned all the way. then replace the freewheel body.
Gear shifting operation
Disassembly
* Grease the inner cable and the inside of the outer casing before use to Note:
ensure that they slide properly. Do not attempt to disassemble the Both lever (A) and lever (B) always return to the initial position when they are
* For any questions regarding methods of installation, adjustment, freewheel body, because it may released after shifting. When operating one of the levers, always be sure to turn
Inserting the inner cable
Assembly
maintenance or operation, please contact a professional bicycle dealer. result in a malfunction. the crank arm at the same time.
Insert the inner cable into the outer casing from
Freewheel body washer
the end with the marking on it. Apply grease
To shift from a small sprocket to a larger sprocket
Tightening torque:
This service instruction explains how to use and maintain the Shimano
10 mm Allen key (TL-WR37) from the end with the marking in order to
35 - 50 Nm {305 - 434 in. lbs.}
To shift one step only, press lever (A) to the (1)
Marking
bicycle parts which have been used on your new bicycle.
maintain cable operating efficiency.
position. To shift two steps at one time, press to the (2)
For any questions regarding your bicycle or other matters which are not
FH-R080
Note:
position. A maximum three-step shift can be made in
related to Shimano parts, please contact the place of purchase or the
Do not attempt to disassemble the Freewheel body
bicycle manufacturer. this manner.
7
Cutting the outer casing
freewheel body, because it may result
Disassembly
When cutting the outer casing, cut the opposite end
� in a malfunction.
to the end with the marking. After cutting the outer
Special grease is used inside the
2
casing, make the end round so that the inside of the
freewheel body.
These service instructions are
Lever (A) initial 1
Do not lubricate the freewheel body
printed on recycled paper and hole has a uniform diameter.
One Holland Irvine CA 92618 U.S.A. Phone [phone] Assembly
position
can be recycled again
with ordinary grease or oil, as this may
cause problems with the operation of
Industrieweg 24 NL-8071 CT Nunspeet Holland Phone [phone] Attach the same outer end To shift from a large sprocket to a smaller sprocket
Freewheel body washer
the clutch mechanism.
cap to the cut end of the
Press lever (B) once to shift one step from a larger to a
77 Oimatsu-cho 3-cho Sakai Osaka 590-8577 Japan Phone [phone] Outer end cap
10 mm Allen key outer casing.
Tightening torque:
smaller sprocket.
Please note: specifications are subject to change for improvement without notice. (English) (TL-WR37)
150 Nm {1300 in. lbs.}
� Oct. 1998 by Shimano Inc. XBC SZK Printed in Malaysia
TL-CN24
1=2.38mm
CHAIN
GAUGE
SHIMANO
JAPAN
TL-CN24
1=2.38mm
CHAIN
GAUGE
SHIMANO
JAPAN
1
c
-
a
4
T
8
8
1
2
3
4
5
6
8