Shimano SM-PM50 Service Instructions

SM-PM50
Shimano
Brand
Shimano
Model
SM-PM50
Type
Service Instructions

Shimano SM-PM50 is a power modulator designed to enhance braking control and modulation for specific Shimano brake systems, typically used in road cycling. It operates within a specific range of braking force, increasing the cable stroke at the brake lever to provide a more linear and predictable braking response. This allows riders to apply braking power more gradually, reducing the risk of wheel lock-up and skidding, especially in slippery or technical conditions.

Shimano SM-PM50 is a power modulator designed to enhance braking control and modulation for specific Shimano brake systems, typically used in road cycling. It operates within a specific range of braking force, increasing the cable stroke at the brake lever to provide a more linear and predictable braking response. This allows riders to apply braking power more gradually, reducing the risk of wheel lock-up and skidding, especially in slippery or technical conditions.

SM-PM50
BL SIDE BR SIDE
Braking Performance Comparison
Braking force at wheel
Cable stroke at brake lever
(kg)
w/o power
modulator
w/ power modulator
Effective
operating range of
the power modulator
Install the SM-PM50 power modulator to the ST-C503 brake lever as
shown in the illustration.
When the brakes are applied, the outer casing at the brake
caliper end will move about 6 mm toward the brake lever, so
make sure there is enough excess length in the outer casing
for this to happen.
Install the power modulator in a position where it will not
interfere with the brakes when they are applied.
Install the power modulator in a position where it will not
interfere with the frame.
Installing the SM-PM50
50 – 200 mm
The power modulator is a device that makes it easier to control
braking by increasing the cable stroke at the brake lever within
a certain constant range of braking force.
If the effective operating range of the power modulator is
exceeded, the brake will operate as a normal brake (sensitive
and powerful). In that case, the brakes may operate more
powerfully than intended and may cause the wheel to lock up.
Therefore it is essential that you fully understand and test the
performance of the power modulator before use.
The power modulator is not equipped with a function to
prevent the wheel from locking up.
SI-PM50A
Before use‚ read these instructions carefully‚ and follow them for correct use.
SM-PM50
Outer casing at
brake lever end
Outer casing at
brake caliper end
Note:
The SM-PM50 is designed for use with the BR-C501 brake system.
In order to realize the best performance, we recommend that the
following combination be used.
NEXAVE
ST-C503
BR-C501
SM-RT50
Power Modulator
Please note: Specifications are subject to change for improvement without notice. (English)
When brakes
are not applied
When brakes
are applied
Approx. 6 mm
Jun. 2002 by Shimano Inc. PIT. IZM. Printed in Malaysia
C
One Holland Irvine CA 92618 U.S.A. Phone 949-951-5003
Industrieweg 24 NL-8071 CT Nunspeet‚ Holland Phone 31-341-272222
3-77 Oimatsucho‚ Sakai‚ Osaka‚ Japan Phone 072-223-3243
CAUTION
General Safety Information
– To avoid serious injuries:
Technical Service Instructions
Series
Brake lever
Brake caliper
Rotor
Brake cable
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Shimano SM-PM50 Service Instructions

SM-PM50
Shimano
Brand
Shimano
Model
SM-PM50
Type
Service Instructions

Shimano SM-PM50 is a power modulator designed to enhance braking control and modulation for specific Shimano brake systems, typically used in road cycling. It operates within a specific range of braking force, increasing the cable stroke at the brake lever to provide a more linear and predictable braking response. This allows riders to apply braking power more gradually, reducing the risk of wheel lock-up and skidding, especially in slippery or technical conditions.

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