Shimano WH-7801-C, WH-7801-C50 Service Instructions

Rim width

Rim height

CS-7800, CS-6600*

CN-7801, CN-6600

Left side

General Safety Information

WARNING

CAUTION

CAUTION

Technical Service Instructions SI-4BV0C

WH-7801-carbon
WH-7801-carbon50

Wheel

• Before use, check the wheels to make sure that there are no bent or loose spokes,
dents, scratches or cracks on the rim surface. Do not use the wheel if any of these
problems are found.

• Do not use in combination with bottom link-type suspension forks. With these types
of forks, the clearance between the hub axle and the brake shoes can change due
to the operation of the suspension, so that when the brakes are applied, the brake
shoes may touch the spokes.

• If the quick release mechanism is not used correctly, the wheel may come off the
bicycle and serious injury could result. Read the Service Instructions for the quick
release mechanism thoroughly before use.

• Use rim cement to securely affix tubular tires to the rims. If the tires are not fully
secure, they may come off the rims, and serious accidents and injury may result.

• These wheels are designed for riding on paved surfaces. If the wheels are used on
unpaved surfaces, the wheels may become bent or damaged, and accidents may
result.

• 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.

• Parts are not guaranteed against natural wear or deterioration resulting from normal
use.

• The tires should be inflated to a suitable pressure before use.

• Carbon fiber rims become worn due to friction from the brake shoes, and there
may be a "run-in" period before the full performance of the rims can be obtained.
As the run-in period progresses, the braking force will become stronger.You should
take note of the increase in braking force during this time to ensure proper safety.

• Use R55C carbon fiber rim brake shoes with the WH-7801-carbon / carbon50. If
brake shoes such as the R55C standard shoes or R55C high-performance shoes
are used, the braking force provided by the brakes may be insufficient, or the brake
shoes may become abnormally worn.
Shimano accepts no responsibility for reduced rim life which might occur from
using R55HC brake shoes.

• Use of genuine Shimano spokes, nipples and washers is strongly recommended. If
non-Shimano parts are used, the area where the nipple seats into the hub flange
may become damaged.

• Before use, check that there are no pieces of metal or other foreign objects sticking
to the brake pads. If any such items are present, they may cause damage to the
rim when the brakes are applied.

• The nipples have large diameters and are easy to rotate in order to make it easier
to increase the spoke tension.However, be careful not to overtighten the nipples
when adjusting the spoke tensions. If the nipples are overtightened, damage to the
rim may result.
(We recommended that you ask authorized bicycle dealers to make the
adjustments.)

Specification

CPSC

AS

DIN

Color

White

Amber

Amber

Model number

RR-550-WUWSW

RR-550-WUASW

RR-317-WUASW

Applicable tire size

Chain

Cassette sprocket

* CS-6600 (for 11T or 12T smallest sprocket only)

10-speed

10-speed

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

Tubular tire

700C

WH-7801-carbon

10

700C

X

278mm

274mm / 300mm

20.8mm

28mm

24mm

WH-7801-carbon50

10

700C

X

256mm

250mm / 278mm

20.8mm

50mm

50mm

Model number

Speeds

Rim size

Applicable tires

Applicable spoke length

Tubular

For front

For rear

For front

For rear

Specifications

Hook the spoke through the rim as shown in the illustration.

Spoke lacing

Installation of the HG sprockets

Lace the spokes as shown in the illustration.

Lock ringSprocket spacers

A

Spoke tension value

*These values should be used as a guide only.

For front For rear

Right (sprocket) side

1000-1600N
(

225-360Ibf

)

600-1100N

(135-247Ibf)

980-1400N

(220-315Ibf)

(For front)

At the front, a
radial assembly
is used at both
the left and
right

(For rear)

Replacing the spokes

Note

• If the wheel becomes stiff and difficult to turn, you should lubricate it with grease.

• Do not apply any oil to the inside of the hub, otherwise the grease will come out.

• Special spoke wrenches are available as optional accessories.

• We recommend that you ask authorized bicycle dealers to adjust the spoke tensions if

there is any initial play in the spokes and after the first 1,000 km of riding.

• Spoke protectors (CP-WH20-A) are also sold separately. Please ask your bicycle
dealer for details.

• For maximum performance we highly recommend Shimano lubricants and
maintenance products.

• Reflectors (manufactured by CATEYE) are also sold separately. Please ask your
bicycle dealer for details.

For each sprocket, the surface
that has the group mark should
face outward and be positioned
so that the wide parts of the
gear projections on each
sprocket and the A part (where
the groove width is wide) of the
freewheel body are aligned.

The groove is
wide at one
place only.

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

• To replace the HG sprockets, use the special tool (TL-LR15) and
TL-SR21 to remove the lock ring.

Tightening torque:

30 - 50 N·m

{261 - 434 in. lbs.}

Rim

Spoke

a

c

-

1

4

T

Wide part

Replacement of the freewheel body

Please note: specifications are subject to change for improvement without notice. (English)
© Jan. 2006 by Shimano Inc. XBC SZK Printed in Japan

One Holland, Irvine, California 92618, U.S.A. Phone: [phone] Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: [phone] Oimatsu-cho Sakai-ku, Sakai, Osaka 590-8577, Japan

These service instructions are printed on recycled paper.

• Remove the freewheel body fixing nut (inside the freewheel body), and then replace the freewheel body. (The
freewheel body fixing nut has a left-hand thread.)

• 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)

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

Tightening torque:

10 - 15 N·m

{86 - 130 in. lbs.}

Disassembly

Assembly

Freewheel body fixing nutFreewheel body

5mm Allen key 5mm Allen key

Hub axle

The WH-7801 freewheel body is
not interchangeable with the
WH-7800.

Do not remove the seal ring,
otherwise it will cause a severe drop
in the waterproofing performance.

Lock ring

Tool
(TL-SR21)

Disassembly

TL-LR15