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General Safety Information
WARNING
– To avoid serious injuries:
It is important to completely understand the operation
of your bicycle's brake system. Improper use of your
bicycle's brake system may result in a loss of control
or an accident, which could lead to severe injury.
Because each bicycle may handle differently, be sure
to learn the proper braking technique (including brake
lever pressure and bicycle control characteristics) and
operation of your bicycle. This can be done by
consulting your professional bicycle dealer and the
bicycle's owners manual, and by practicing your riding
and braking technique.
The SB-8S20/SB-7S45 /BL-IM60/BL-IM45 brake
levers are equipped with a mode switching
mechanism. Be sure to use the BR-IM70-R/BRIM73-R with the mechanism in the C.R mode position.
C.R mode position
V
V
C R
C
R
The C indicates the mode position for
compatibility with cantilever brakes.
The R indicates the mode position for
compatibility with roller brakes.
When securing the brake arm to the frame, be sure to
use a brake arm clip that matches the size of the
chainstay, and securely tighten them with the clip
screw and clip nut to the specified tightening torque.
Use a lock nut with a nylon insert (self-locking nut) for
the clip nut. It is recommended that standard Shimano
parts be used for the clip screw, clip nut and brake
arm clip.
In addition, use a brake arm clip that matches the size
of the chainstay.
If the clip nut comes off the brake arm, or if the clip
screw or brake arm clip becomes damaged, the brake
arm may rotate on the chainstay and cause the
handlebars to jerk suddenly, or the bicycle wheel may
lock and the bicycle may fall over, causing serious
injury.
Obtain and read the service instructions carefully prior
to installing the parts. Loose, worn, or damaged parts
may cause serious injury to the rider.
We strongly recommend only using genuine Shimano
replacement parts.
Always make sure that the front and rear brakes are
working correctly before you ride the bicycle.
If the road surface is wet, the tires will skid more
easily. If the tires skid, you may fall off the bicycle. To
avoid this, reduce your speed and apply the brakes
early and gently.
Read these Technical Service Instructions carefully,
and keep them in a safe place for later reference.
CAUTION
– To avoid serious injuries:
When using the Shimano Inter-M brake system,
1.
avoid continuous application of the brakes when
riding down long slopes, as this will cause the internal
brake parts to become very hot, and this may weaken
braking performance. It may also cause a reduction
in the amount of brake grease inside the brake, and
this can lead to problems such as abnormally sudden
braking.
The design of the Shimano Inter-M brake system has
been carried out based on standards such as ISO
4210 and DIN 79100-2. These standards specify the
performance for an overall weight of 100 kg. If the
overall weight exceeds 100 kg, the braking force
provided by the system may be insufficient for correct
braking, and durability of the system may also be
reduced.
In order to get the best performance from the
2.
Shimano Inter-M brake, be sure to use Shimano
brakes cables and brake levers as a set.
The amount of movement of the inner cable must
be 14.5 mm or more when the brake lever is
depressed. If it is less than 14.5 mm, braking
performance will suffer, and the brakes may fail
to work.
If the hub nuts are cap nuts, use a frame with
3.
dropouts that are at least 7 mm thick.
Check that the brake unit is firmly secured to the hub
4.
body with the brake unit fixing nut.
MIN 2Nm
JAPAN
Brake unit fixing nut
GREASE
RELEASE
Brake unit
Tightening torque:
20 – 25 N·m {174 – 217 in. lbs.}
Check that the wheel is fixed securely to the frame
5.
with the hub nuts.
MIN 2Nm
JAPAN
Hub nut
GREASE
RELEASE
Tightening torque:
30 – 45 N·m {260 – 390 in. lbs.}
Check that the brake arm is securely fastened to
6.
the chainstay by the brake arm clip. If it is not
installed correctly, braking performance will suffer.
Brake arm clip
Chainstay
If excessive force
is applied to the
brake arm to
secure it, the
wheel will make
noise and become
JAPAN
difficult to turn.
MIN 2Nm
Make sure that
you don't apply
excessive force
when installing.
Brake arm
When installing the clip screw, securely hold
the clip nut with a 10 mm spanner while
tightening the clip screw. After tightening,
check that the clip screw protrudes about 2 –
3 mm from the surface of the clip nut.
Brake arm
Clip nut
Brake arm clip
Clip screw
(M6 16 mm)
2 – 3 mm
Tightening torque:
2 – 3 N·m {17 – 26 in. lbs.}
If any of the following occur while using the brakes,
7.
stop riding immediately and ask the place of
purchase to carry out inspection and repairs.
1) If abnormal noise is heard when the brakes
are applied
2) If braking force is abnormally strong
3) If braking force is abnormally weak
In the case of 1) and 2), the cause might be not
enough brake grease, so ask the place of purchase
to grease the mechanism with special roller brake
grease.
If the brake is used frequently, the area around the
8.
brake may become hot. Do not touch the area
around the brake for at least 30 minutes after you
finish riding the bicycle.
Area around the brake
If the brake cable becomes rusted, braking
9.
performance will suffer. If this happens, replace the
brake cable with a genuine Shimano brake cable
and re-check the braking performance.
The BR-IM70-R/BR-IM73-R brake unit should never
10.
be disassembled. If it is disassembled, it will no
longer work properly.
NOTE:
Use a wheel with 3x or 4x spoke lacing. Wheels with
radial lacing cannot be used because the spokes and
the wheel can be damaged when applying the brakes
and brake noise can be generated.
The Inter-M brake is different from conventional
brakes in that the inside of the brake drum is filled with
grease. This may cause the turning of the wheel to be
slightly heavier than usual, particularly in cold weather.
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 handling or
adjustment, please contact the place of purchase.
SI-75E0E
BR-IM70-R
Inter-M Brake
BR-IM73-R
Technical Service Instructions
In order to realize the best performance from the Inter-M
brake, we recommend that the following combinations be
used.
Brake
Hub
Lever
Brake cable
BR-IM70-R / BR-IM73-R
SG-8R20 / SG-7R46 / FH-IM70
SB-8S20 / SB-7S45 /
BL-IM60 / BL-IM45
Disconnecting the brake cable
from the brake unit
Push the cam transmission plate until it stops.
1.
Then, slide the link unit along the guide groove
in the cam transmission plate to remove the
link unit. If the link unit is difficult to remove,
turn the cable adjusting bolt clockwise to
release the cable tension first.
Guide groove
GREASE
While pushing the
cam transmission
plate forward
JAPAN
MIN 2Nm
RELEASE
Link unit
1
2
Slide down
Link unit
MIN 2Nm
Guide groove
GREASE
JAPAN
RELEASE
3
Pull back strongly
Slide the outer casing holder along the guide
2.
slot in the brake arm to remove it from the slot.
Guide slot
Cable
adjusting bolt
Outer casing holder
JAPAN
MIN 2Nm
Brake arm
RELEASE
To install the brake cable again, carry out
the above procedure in reverse.
Note:
When installing the link unit to the cam
transmission plate, push the link unit in
until it clicks, and check that it is securely
in the position shown in the illustration.
The rivet should
fit in the center
of section A of
RELEASE
the cam
transmission
plate.
Section A of cam
Link unit rivet
Depress the brake lever to check the
braking performance. If the braking
performance is poor, adjust the brake
cable once more while referring to
"Adjusting the brake cable".
transmission plate
Installing the brake cable
Slide the outer casing holder along the guide slot in
1.
the brake arm to set it into the slot.
Guide slot
JAPAN
MIN 2Nm
Brake arm
Outer casing holder
Hold the cam transmission plate with your hand,
2.
and slide the link unit along the guide groove in the
cam transmission plate to install the link unit.
While holding
the cam
GREASE
transmission
MIN 2Nm
Guide groove
Link unit
plate
JAPAN
1
RELEASE
2
Place into the guide groove
GREASE
JAPAN
MIN 2Nm
Guide groove
Link unit
RELEASE
3
Slide strongly along the guide
groove as far as possible
Note:
When installing the link unit to the cam
transmission plate, push the link unit in until it
clicks, and check that it is securely in the position
shown in the illustration.
The rivet should fit
in the center of
RELEASE
Link unit rivet
Place the cable adjusting bolt so that it is 20 – 22
3.
mm from the end of the outer casing holder, and
then pass the inner cable through the cable
adjusting bolt and then through the hole in the inner
cable fixing bolt.
Cable
adjusting bolt
Should be
section A of the cam
transmission plate.
Section A of cam transmission plate
Outer casing holder
JAPAN
MIN 2Nm
Hole in the inner
cable fixing bolt
GREASE
RELEASE
20 – 22 mm
Check that both ends of the outer casing are
4.
securely inserted into the cable adjusting bolts of
both the brake lever and brake arm.
Cable adjusting
bolt
Cable adjusting bolt
Push the cam transmission plate back until it stops.
5.
Then, while pulling the inner cable to apply the full
Both ends of the outer casing
should be securely inserted.
JAPAN
MIN 2Nm
amount of tension to the cable, tighten the inner
cable fixing nut.
Tightening torque:
6 – 8 N·m {52 – 69 in. lbs.}
While pushing
the cam
GREASE
transmission
plate
1
MIN 2Nm
Inner cable
fixing nut
3
Tighten
JAPAN
2
RELEASE
Pull strongly
RELEASE
RELEASE
Note:
After tightening the inner cable
RELEASE
fixing nut, attach the inner end
cap to the end of the inner
cable. Then set the inner end
cap so that it does not touch
the link and the spokes.
Adjusting the brake cable
After checking that the wheel does not easily turn
1.
while the brake cable is being pulled, depress the
brake lever about 10 times as far as the grip in order
to run in the brake cable.
Depress about
10 times
Note:
If the brake cable is not run in, it will need to
be adjusted again after only a short period of
use.
Turn the cable adjusting bolt of the brake unit or
2.
brake lever so that there is about 15 mm of play in
the brake lever.
The amount of brake lever play is the distance
from the position where the brake lever is not
operated to the position where a force is felt
suddenly when the brake lever is pulled.
Cable adjusting bolt
15 mm of play
GREASE
JAPAN
MIN 2Nm
RELEASE
Cable adjusting bolt
After depressing the brake lever to check the
3.
braking performance, secure the cable adjusting
bolt with the cable adjusting nut.
JAPAN
MIN 2Nm
GREASE
These service instructions explain 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.
These service instructions are printed on recycled paper.
Please note: Specifications are subject to change for improvement without
notice. (English)
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, Osaka 590-8577, Japan
Cable adjusting nut
Tightening torque:
1 – 2 N·m {9 – 17 in. lbs.}
C
Sep. 2006 by Shimano Inc. PIT. SZK. Printed in Japan
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