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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 IB-DR70 /IB-DR50 /
IB-HR70 /IB-HR50 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.
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.
The front Inter-M brake system should only be
2.
installed to the left side of a bicycle which is 26" or
larger. If it is used on a bicycle which is smaller
than 26", the braking force may be too great, which
could cause accidents.
In order to get the best performance from the
3.
Shimano front Inter-M brake, be sure to use
Shimano brakes cables and brake levers as a set.
(Refer to the product line-up.)
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.
Check that the front brake unit is firmly secured to
4.
the hub body with the brake unit fixing nut.
Front brake unit
Brake unit fixing nut
Tightening torque:
15 – 20 N·m {130 – 174 in. lbs.}
Check that the hub axle is touching the back of the
5.
fork end, and that the end of the brake arm is
protruding 1 mm or more from the brazed-on
bracket of the front fork. Check also that the wheel
is firmly secured to the frame with the hub nut. If
the wheel is not installed properly, it may come off
the frame, which could result in serious accidents
when riding.
Touching
Brazed-on
bracket
Hub axle
Hub nut
Tightening torque:
20 – 25 N·m {174 – 217 in. lbs.}
If any of the following occur while using the brakes,
6.
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
7.
the 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
8.
performance will suffer. If this happens, replace
the brake cable with a genuine Shimano brake
cable and re-check the braking performance.
1 mm
or
more
The IB-DR70 /IB-DR50 / IB-HR70/ IB-HR50 front
9.
brake unit should never be disassembled. If they
are disassembled, malfunctions and damage to the
front brake unit could result.
Consult the place of purchase for details on
10.
removing and installing the front brake unit.
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 front Inter-M brake is different from conventional
band 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.
The front Inter-M brake has a built-in power modulator
which controls the braking force applied to the hub.
Noise is generated by the operation of the power
modulator when the brake is applied, but this is not a
sign of a malfunction.
If you apply the front Inter-M brake strongly while the
bicycle is stopped and then shake the wheel, you will
notice that there is a small amount of play in the
brakes. This is normal, and will not cause any
problems at all while riding.
To check the amount of looseness in the head parts,
grasp the middle of the handlebar and one of the front
forks as shown in the illustration, and then move the
head parts back and forth in the directions indicated
by the arrows.
Moreover, because the brakes give a small amount of
play if you apply the brakes fully and shake the wheel
as described above, this will make it more difficult to
check the looseness in the head parts.
For maximum performance we highly recommend
Shimano lubricants and maintenance products.
Parts are not guaranteed against natural wear or
deterioration resulting from normal use.
SI-2ZG0A
Front Inter-M
Brake System
Technical Service Instructions
In order to realize the best performance from the Shimano
front Inter-M brake system, we recommend that the
following combination be used.
Hub unit with
integrated brake
Lever
Brake cable
IB-DR70 /IB-DR50 /
IB-HR70 /IB-HR50
SB-8S20 /SB-7S45 /
BL-IM60 /BL-IM45
Installing the cooling fin
(IB-DR70 /IB-HR70 only)
Be sure to assemble the wheel before installing
the cooling fin to the hub.
Pass the fin over the brake arm and the hub axle.
1.
Turn the wheel at this time to move the spokes to a
position where the fin can be
inserted more easily.
Note:
Install the fin so
that the
embossed letter
is facing toward
the outside.
Fin
Place the fin into the thread
2.
on the left side of the
hub shell and screw
it in. Note that the
fin has a left-hand
thread. After this,
use the fin
tightening tool to
securely tighten
the fin.
Fin
Fin tightening tool
Tightening torque:
3 – 3.5 N·m {26 – 30 in. lbs.}
Check that the fin has been tightened so that the
3.
surface of the fin is at the same height as the edge
of the thread of the hub shell, and then tighten the
set bolt to secure the fin.
Tightening torque:
Set bolt
0.4 – 0.5 N·m
{3.5 – 4.3 in. lbs.}
1.5 mm Allen key
The surface of the fin
and the edge of the
thread of the hub
shell should be flush.
Brake arm
Hub axle
Securing the brake arm
Set the brake arm into the brazed-on bracket of the front
fork, and then tighten the
brake arm fixing bolt with
non-turn stopper.
(Use of genuine
Shimano parts is
recommended.)
2.5 mm Allen key
Front fork
Brazed-on
bracket
Brake arm fixing
bolt
Brake arm
Tightening torque:
0.4 – 0.5 N·m {3.5 – 4.3 in. lbs.}
Installing the brake cable
Pass the inner cable coming from the brake lever
1.
through the cable adjusting bolt and the outer
casing holder.
Outer casing holder
Cable adjusting bolt
Attach the inner cable fixing bolt unit to the inner
2. 7.
cable.
Inner cable fixing bolt
unit
Pass the inner cable through the hole.
125.5 mm
Pull the inner cable while securing the inner
cable fixing bolt unit.
Tightening torque:
6 – 8 N·m {52 – 69 in. lbs.}
1.
Align the red mark on the inner cable fixing washer
3.
so that it faces in the direction of the groove in the
winder unit, and then insert the inner cable fixing
bolt unit and push it into the groove in the winder
unit as far as it will go.
Red mark on
inner cable
fixing washer
Groove in
winder unit
Inner cable
fixing bolt unit
2.
Insert the inner cable fixing
bolt unit into the groove in
the winder unit as far as it
will go.
Hook the inner cable onto the cable hook.
4.
Inner cable
Cable hook
Place the outer casing holder into the hooking hole
5.
of the brake arm and then slide it downward.
Hooking hole of
brake arm
Outer casing holder
Check that the outer casing holder is securely sitting
6.
at the bottom of the hooking hole of the brake arm,
and then cut off any excess length of inner cable.
After this, install the inner end cap.
Note:
Set the inner end cap so that it does
not touch the link and the spokes.
20 – 30 mm
3.
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
Turn the cable adjusting bolt
to tighten the cable until the
point where the turning of
the wheel starts to
become stiff.
Cable adjusting
bolt
This completes the installation of the brake cable.
To remove the brake cable, carry out the
installation procedure in reverse. In addition, be
sure to remove the fin first before replacing any
spokes.
Adjusting the brake cable
After checking that the wheel does not easily turn
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
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
Cable adjusting bolt
After depressing the brake lever to check the
braking performance, secure the cable adjusting
bolt with the cable adjusting nut.
Tightening torque:
1 – 2 N·m {9 – 17 in. lbs.}
Cable adjusting
nut
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.
C
Sep. 2006 by Shimano Inc. PIT. SZK. Printed in Singapore
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