Page 1
Fig. 3
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-shi, Osaka 590-8577, Japan
General Safety Information
• The HB-M978/M778/M758/M668 front hub is not designed for downhill bicycle
riding and freeriding. However, depending on the riding condition, The hub
axle could develop a crack, which may result in failure of the hub axle. This
can lead to an accident that could result in serious injury or even death.
Before riding, you should carefully check your hubs to make sure that there
are no cracks in the axles , and if you find any sign of a crack or any other
unusual condition, do NOT use the bicycle.
• The securing method and tightening torque for the front wheel both vary
depending on the type of front suspension fork being used. When installing
the front wheel to the front suspension fork, always be sure to follow the
directions given in the Service Instructions for the front suspension fork. If the
directions are not followed, the front wheel may fall out of the front suspension
fork and serious injury may result.
• Please use extra caution to keep your fingers away from the
rotating disc brake rotor during installing or servicing the
wheel. The rotor is sharp enough to inflict severe injury to
your fingers if caught within the openings of moving rotor.
• The calipers and rotor will become hot when the brakes are operated, so do
not touch them while riding or immediately after dismounting from the bicycle,
otherwise you may get burned. Check that the brake components have cooled
down sufficiently before attempting to adjust the brakes.
• Always make sure that the front and rear brakes are working correctly before
you ride the bicycle.
• Be careful not to allow any oil or grease to get onto the rotor and brake pads,
otherwise the brakes may not work correctly.
• If any oil or grease do get on the pads, you should replace the pads. If any oil
or grease gets on the rotor, you should clean the rotor. If this is not done, the
brakes may not work correctly.
• If the axle release lever is on the same side as the rotor,
there is the danger that it may interfere with the rotor, so
check that it does not interfere.
• Check that the wheels are fastened securely before
riding the bicycle. If the wheels are loose in any way, they
may come off the bicycle and serious injury may result.
• Obtain and read the service instructions carefully prior to installing the
parts. Loose, worn or damaged parts may cause the bicycle to fall over and
serious injury may occur as a result. We strongly recommend only using
genuine Shimano replacement parts.
• Read these Technical Service Instructions carefully, and keep them in a safe
place for later reference.
• Be sure to carefully read the Service Instructions for the disc brakes also.
• When using the special tool (TL-FC36) to remove and install the rotor
mounting ring, be careful not to touch the outside of the rotor with your hands.
Wear gloves to protect your hands from getting cut.
■ Burn-in period
• Disc brakes have a burn-in period, and the braking force will gradually
increase as the burn-in period progresses. Make sure that you are aware of
any such increases in braking force when using the brakes during the burn-in
period. The same thing will happen when the brake pads or rotor are
replaced.
Note
• If the brake caliper mounting boss and the dropout are not parallel, the rotor
and caliper may touch.
• If the rotor is worn, cracked or warped, it should be replaced.
• Parts are not guaranteed against natural wear or deterioration resulting from
normal use.
• For maximum performance we highly recommend Shimano lubricants and
maintenance products.
< Assembly >
Install the axle pipe, and then use the special tools to tighten the lock nut so as to doublelock the mechanism as shown in the illustration. Use the TL-HB15 to adjust the hub rotation
performance.
■ HB-M978/M778/M668
■ HB-M758 (6 bolt type)
WARNING
CAUTION
Please note: specifications are subject to change for improvement without notice. (English)
© Jan. 2009 by Shimano Inc. XBC SZK Printed in Japan.
Series
Caliper
Brake Lever
Rotor
In order to realize the best performance, we recommend that the following
combination be used.
Model No.
Front hub
No. of spoke holes
Specifications
Maintenance
These units can be disassembled as shown in the
illustrations. Grease should be applied to each part at
periodic intervals.
HB-M978
(26 mm spanner)
HB-M778/M758/M668
(TL-HS22)
(TL-HS21)
Axle pipe
Tighten
Rotor fixing lock ring
TL-FC36
Check that the spokes have been laced
as shown in the illustration.
A radial assembly cannot be used.
When using the special tool (TL-FC36) to remove and install
the rotor mounting ring, be careful not to touch the outside
of the rotor with your hands. Wear gloves to protect your
hands from getting cut.
Install the rotor and the rotor tightening plate
to the hub, and then install and tighten the
bolts as shown in Fig. 1.
While wearing gloves, apply a force to the
rotor to turn it in a clockwise direction as
shown in Fig. 2. While doing this, tighten the
rotor fixing bolts in the order shown in the
illustration.
Use a flat-tipped screwdriver or similar tool to bend the
edges of the tightening plate over the heads of the bolts
as shown in Fig. 3.
Wheel spoke lacing
Rotating direction
of wheel
Front left Front right
Note:
The cover on the right side of the
hub unit cannot be disassembled.
Tightening torque:
40 N·m {350 in. lbs.}
Tightening torque:
30 - 35 N·m
{261 - 305 in. lbs.}
CAUTION
Installation of the rotor
Fig. 1
Tightening plate
Rotor
Hub
Rotor fixing bolts
(#T25 torx)
*
*
TORX is a registered
trademark of Camcar LLC.
Tightening torque:
2 - 4 N·m {18 - 35 in. lbs.}
Fig. 2
Tightening plate
Axle release
lever
Rotor
SI-26P0A-002-00
Technical Service Instructions SI-26P0A-002
HB-M978 / HB-M778 / HB-M758
HB-M668
00
Front hub
BR-M975 BR-M775
ST-M975 / BL-M975 ST-M775 / BL-M775
SM-RT97 SM-RT78 / SM-RT97
XTR XT
BR-M665
BL-M665
SM-RT64
SLX
HB-M778/M758 (6 bolt type)
36 / 32
HB-M978
32
HB-M668
32
Applying grease
DURA-ACE grease
(Y-04110000)
• HB-M978 / M778 / M758
No. of balls: 17 Ball size: 5/32”
• HB-M668
No. of balls: 15 Ball size: 3/16”
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