Technical Service Instructions

FH-M805

FH-M800

Freehub

SI-3C20D

General Safety Information

WARNING

• 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 FH-M805 / FH-M800 freehub 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.

• A hub axle is an essential component for the firm and reliable attachment of a rear hub and a rear derailleur to the bicycle frame. Its material, strength, size and shape all are key to accomplishing this goal. That is why Shimano ships a hub axle with a hub.

We strongly recommend that you use the hub axle that is shipped with a hub when attaching the hub to the bicycle frame. A wheel may come off and cause a serious injury to the rider if you use a different hub axle because (1) a different hub axle may not be long enough to be able to sufficiently tighten the rear hub, and/or (2) a different hub axle may break due to lack of strength.

Shimano does not sell its hub axle separately except when a customer uses Shimano’s RD-M805 or RD-

M800 rear derailleur with a non-Shimano rear hub. However, if a customer chooses to use a non-Shimano rear hub, the customer is doing so at his/her own risk and is responsible for making sure that the wheel is firmly fixed.

• Before riding, confirm that the hub axle has been tightened with torque of 35 - 45 N·m and the wheel has been secured to the frame. Serious injury can result from falling if the wheel comes off.

• 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

• When installing the wheel and rear derailleur onto the frame, first apply grease to the hub axle by following directions in the Service Instructions.

• 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.

• You should periodically wash the sprockets in a neutral detergent and then lubricate them again. In addition, cleaning the chain with neutral detergent and lubricating it can be a effective way of extending the useful life of the sprockets and the chain.

• If the chain keeps coming off the sprockets during use, replace the sprockets and the chain.

• 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.

In order to realize the best performance, we recommend that the following combination be used.

Series

DUAL CONTROL lever

Outer casing

SAINT

ST-M800

SIS-SP41

Rear derailleur

Type

Freehub

Front hub

Gears

Cassette sprocket

Chain

Bottom bracket guide

RD-M805

FH-M805

SGS / GS / SS

HB-M800A

9

CS-M760

RD-M800

FH-M800

CN-HG93

SM-SP17 / SM-BT17 t

Specifications

Freehub

Model No.

Gears

No. of spoke holes

Overlock nut dimensions

Axle diameter

Applicable rear derailleur

FH-M805

9

36 / 32

150 mm

12 mm

RD-M805

FH-M800

9

36 / 32

135 mm

10 mm

RD-M800

Installation to the frame

(1)

Applying grease

Hub axle

Freehub

Frame

Cassette sprocket

1.

Install the sprockets to the FH-M805 / FH-M800 freehub, place the freehub onto the frame and pass the hub axle through it.

2.

Install the hub axle fixing nut that is attached to the rear derailleur onto the hub axle.

* FH-M805 (ø12mm), FH-M800 (ø10mm)

3.

Turn the hub axle to secure the freehub and the rear derailleur to the frame.

Check that the pawl on the fork end is set into the end stopper.

Freewheel hub / Rear derailleur tightening torque:

35 - 45 N·m {305 - 392 in.lbs}

Check that the axle on the right hand side protrudes about

20 – 30 mm. If it is not long enough, the wheel may come off because the hub axle does not tighten the hub sufficiently.

(2)

(3)

M800 (ø10mm)

M805 (ø12mm)

Hub axle fixing nut

For BMX-style dropout specifications

6 mm Allen key

For vertical dropout specifications

Applying grease

Rear derailleur

FH-M800

FH-M805

End stopper

Axle diameter Vertical dropout

ø10mm

ø12mm

✕

✕

BMX-style dropout

✕

—

Wheel spoke lacing

Check that the spokes have been laced as shown in the illustration.

A radial assembly cannot be used.

Rotating direction of wheel Rear left Rear right

Installation of the rotor

Rotor installation ring

TL-LR20

Tightening torque:

40 N·m {350 in. lbs.}

Installation of the sprockets

(a

Q

)

For each sprocket, the surface that has the group mark should face outward and be positioned so that the wider part of each sprocket and the A part

(where the groove width is wide) of the freewheel body are aligned.

(as)

A

The groove is wide at one place only.

Wide part ba ba ba ba ap ba T

T

1

T ac-14T as ap b a ar ba

11

T a

Q

Lock ring

H Y

P

15

T

Sprocket spacers

13T a

Lock ring spacer

Lock ring

Lock ring spacer

H

P

ERG LID

E

• For installation of the sprockets, use the special tool (TL-LR15) to tighten the lock ring.

Tightening torque:

30 - 50 N·m {261 - 434 in. lbs.}

• To replace the sprockets, use the special tool (TL-LR15) and TL-SR20 to remove the lock ring.

Install the TL-SR20 to the largest sprocket.

Lock ring

Tool

(TL-SR20)

TL-LR15

Disassembly

Maintenance

These units can be disassembled as shown in the illustrations. Grease should be applied to each part at periodic intervals.

<FH-M805 / FH-M800>

1

Applying grease

(Special freehub grease)

Special grease is used for the freewheel body. Do not mix it with other types of grease, as this may cause problems with the operation of the freewheel clutch mechanism.

(Grease part number: Y-3B980000)

Applying grease

DURA-ACE grease

(Y-04110000)

3

4

Applying grease

DURA-ACE grease

(Y-04110000)

2

FH-M800 only

Applying grease

DURA-ACE grease

(Y-04110000)

Part name

1 Right hand cup

2 Left hand cup

3 Left hand lock nut (M20)

4 Left hand cone (M20)

5 Freewheel body fixing nut (M15)

5

Note:

Do not attempt to disassemble the freewheel body, because it may result in a malfunction.

Thread type

Right hand thread

Left hand thread

Right hand thread

Right hand thread

Left hand thread

Special tool

TL-HA20

TL-HA20

TL-HS22 (24mm)

TL-HS21 (23mm)

TL-HS22 (17mm)

Tightening torque

40 - 50 N·m

{350 - 435 in. lbs.}

40 - 50 N·m

{350 - 435 in. lbs.}

30 - 35 N·m

{261 - 305 in. lbs.}

20 - 25 N·m

{175 - 218 in. lbs.}

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, Osaka 590-8577, Japan

Please note: specifications are subject to change for improvement without notice. (English) © Jun. 2004 by Shimano Inc. XBC SZK Printed in Japan t