Shimano ST-7S20 Service Instructions Download Page 1

1.

2.

SI-61S0C

ST-7S20

BL-TY21

CJ-7S40

Rapidfire Lever

SERVICE INSTRUCTIONS

Before use‚ read these instructions carefully‚ and follow them for correct use.  

Brake Lever

Cassette Joint

Be sure to shift the lever one gear at a time, and reduce the 

force being applied to the pedals during shifting. If you try to 

force operation of the shifting lever while the pedals are being 

turned strongly, your feet may come off the pedals and the 

bicycle may topple over, which could result in serious injury.

Be sure to read these service instructions in conjunction 

with the service instructions for the Inter-7 hub before use.

CAUTION

Rapidfire lever operation

Push the top or bottom of the lever body to shift the gears.

Installation of the lever

Install the lever as shown in the illustration.

Installation of the shifting cable

Set the Rapidfire lever to     .  

Next, pass the inner cable through the hole at the rear of the 

Rapidfire lever.

1

Indicator moves toward 7

Depress

Pass the inner cable 

through the hole. 

Lever body

5 mm Allen key

Screwdriver

22.2 mm

The installation angle can be adjusted to one of two 

positions to suit the shape of the handlebars. Angle 

adjustment is carried out by loosening the lever body fixing 

bolt.

The clearance between the cable adjusting bolt and the 

handlebars should be 4 – 6 mm.
The end of the lever operation section should not hit the 

grip.

ST-7S20 Rapidfire Lever

Note:

1

2 3

4

56

7

1

2 3

4

56

7

1

2

3 4 5 6

7

BL-TY21 Brake Lever

Tightening torque:

2.5 – 3 Nm {25 – 30 kgfcm}

Tightening torque:

2.5 – 3 Nm {25 – 30 kgfcm}

Set to

1

Pedaling becomes heavier

Indicator

Attach to the straight 

section of the handlebars.  

Inner cable fixing bolt unit  

101 mm

Pull the inner cable while attaching 

the inner cable fixing bolt unit.

After checking that the end of the outer casing is sitting securely 

in the cable adjusting bolt of the Rapidfire lever, attach the inner 

cable fixing bolt unit to the inner cable.

Note:

 Do not use this inner cable fixing bolt unit with 

           the CJ-4S30 cassette joint.

Inner cable fixing nut

Inner cable fixing washer

10 mm 

 (Black)

Inner cable fixing bolt

Tightening torque:

4 – 6 Nm {40 – 60 kgfcm}

Pass the inner cable through the hole.

Indicator moves toward 1

Pedaling becomes lighter

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