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General Safety Information
• Off-road bicycle riding and extreme mountain bike riding,
represented in part by North Shore style riding, “trials riding”,
or urban stunt riding is an inherently dangerous activity.
There is a risk of being involved in an accident that can result
in a serious injury or even death. It is strongly recommended
that riders wear protective head and body gear and perform
thorough safety checks of their bicycles before riding. Please
remember that you are riding at your own risk and that you
have to consider your experience and your skills very carefully.
• The HB-M801 front hub are designed for off-road bicycle riding and
extreme mountain bike riding, that are represented in part by North
Shore style riding, “trials riding”, or urban stunt riding. 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. If the
front wheel is tightened onto the front suspension fork in accordance
with the tightening torque given in the Service Instructions for the front
suspension fork, the front wheel may turn more stiffly, but the directions
given in the Service Instructions must always be followed.
• 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 injury to the rider.
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.
Note
• Use the TL-HB80 when attaching the HB-M801 front hub to the wheel
trueing tool.
• If the wheel becomes stiff and difficult to turn, you should lubricate it
with grease.
• Do not apply any lubricant to the inside of the hub, otherwise the grease
will come out.
• This product is not warranted against damage resulting from use such
as jumping while riding or if the bicycle falls over, except if such
malfunctions result from non conforming materials or manufacturing
methods.
• Parts are not guaranteed against natural wear or deterioration resulting
from normal use.
• For maximum performance we highly recommend Shimano lubricants
and maintenance products.
WARNING
Installation of the rotor
Tightening torque:
40 N·m {350 in. lbs.}
Rotor
installation ring
TL-LR20
Specifications
Model No.
No. of spoke holes
HB-M801
36 / 32
Front hub
Technical Service Instructions SI-26G0A
HB-M801
Front hub
Check that the spokes have been laced as shown in the illustration.
A radial assembly cannot be used.
Wheel spoke lacing
Front left Front right
Rotating direction of wheel
Series
Shifting lever
Outer casing
Rear derailleur
Type
Freehub
Gears
Cassette sprocket
Chain
Bottom bracket guide
SAINT
ST-M800 / SL-M800
SIS-SP41
RD-M806 / RD-M805 / RD-M801 / RD-M800
SGS / GS / SS
FH-M806 / FH-M801
Front hub
HB-M801
9
CS-M970
CN-HG93
SM-SP17 / SM-BT17
In order to realize the best performance, we recommend that the following
combination be used.
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
Please note: specifications are subject to change for improvement without notice. (English)
© Aug. 2006 by Shimano Inc. XBC SZK Printed in Japan.
These service instructions are
printed on recycled paper.
<Assembly>
Install the axle pipe, and then use the special tools (TL-HS23) to tighten
the lock nut so as to double-lock the mechanism as shown in the
illustration.
TL-HS23
TL-HS23
Axle pipe
Tighten
Tightening torque:
30 - 40 N·m {261 - 350 in. lbs.}
The unit can be disassembled as shown in the illustration.
Apply grease to the various parts at periodic intervals.
Maintenance
Note:
• The HB-M801 cannot be disassembled from the left side of the hub
unit (the rotor fixing serration side).
• When removing and installing the seal, do it very carefully so that the
seal does not become bent.
When reinstalling the seal, make sure that it is facing the right way,
and insert it as far as it will go.
• Do not disassemble the dust-proof cover which is crimped onto the
cone.
• The rotor fixing serrations may become damaged if the disc brake
rotor has not been installed to the HB-M801, so install the accessory
rotor mount cover.
Seal
(Lip is on the outside)
Seal
(Lip is on the outside)
Cone with dust cover
Rotor mount cover
Applying grease
DURA-ACE grease
(Y-04110000)
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