Shimano SG-8C20, Service Manual

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INTER-7 INTER- 8
INTER-7
INTER- 8
• Better Sealing
The INTER-8 hub has adopted a labyrinth seal
system that shuts out water and dirt to extend
the service life and maintain smooth shifting in all
circumstances. Optionally a waterproof dust cap
can be installed ex factory on the non-drive side
before shipment, in case you wish to use the hub
in combination with a seperate brake system such
as V-Brakes.
5 5
shifting torque
labyrinth seal
driver rotation torque
SG-8R25
Premium Version for Roller Brake
SG-8R20
Roller Brake Version
SG-8R25-VS
V-Brake Version
SG-8R20-VS
V-Brake Version
SG-8C20
Coaster Brake Version
• Gear Change Support Mechanism
Shimano’s gear change support mechanism uses
pedaling power to aid down-shifting. The result
is fast and accurate down-shifting with an exep-
tionally light feeling. Mechanical shifting resist-
ance is notably reduced so shifting is not affected
under high loads.
• Robust Construction
Durable planetary and step-up gear sets assure
long trouble-free service.
• Smooth Gear Change
The smaller idling angle realizes shockless
smoother shifting for stressless comfortable gear
change.
• Smoother Rotation
Shimano’s precise manufacturing abilities
construct an internal hub that rotates with
significantly less drag than previous models.
• Close Ratio Wider Range
The INTER-8 hub has increased its gear ratio to
307%, compared to 244% of the INTER-7 hub.
ST-8S20
Shifter with 3-finger Brake Lever
BL-IM65
3-finger Brake Lever
SB-8S20
Shifter with 4-finger Brake Lever
SL-8S20
Shifter
BL-IM60
4-finger Brake Lever
• Fast and Light Shifting
In combination with the Gear Change Support
Mechanism the shifting action is quick and light
even during hight pedaling loads.
• Easy-to-read Gear Indicator
Larger more visible indicator numbers make gear
positions easier to read. Additionally, indicator
symbols help to understand the direction of
shifting progression.
• INTER-8 (SG-8C20): 30% more braking
power compared to INTER-7
3.0
30% more powerful
2.5
2.0
1.0
0.0
1 2 3 4 5 6 7 8
307%
low-high
difference
2.0
0.5
1.0
1.5
1st 8th 7th 6th 5th 4th 3rd 2nd
0.74 (27T)
0.84 (24T)
0.99 (20T)
1.15 (17T)
1.34 (15T)
1.55 (13T)
0.63 (32T)
0.53 (38T)
0.64 (31T)
0.75 (27T)
0.85 (24T)
1.00 (20T)
1.22 (16T)
1.42 (14T)
1.61 (12T)
244%
low-high
difference
20~90º
10~30º
Lay_INTER-8_GB 05 23.12.qxd 23.12.2004 13:39 Uhr Seite 5