Technical Service Instructions
WH-7800
Wheel
SI-4B80B
General Safety Information
WARNING
• 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.
CAUTION
• Two types of rim are available for use with either tubular tires or clincher tires. Use whichever type of rim is suitable for the type of tires used, and make sure that the tires are inflated to the correct pressure.
• If using the rim with clincher tires, use rim tape which can withstand high pressures, otherwise the tires may suddenly puncture and come off, and severe injury may result.
CAUTION
• The Shimano R55HC (high performance) brake shoes use an aggressive compound designed with an emphasis on maximum performance in wet conditions, however they will cause accelerated rim wear.
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.)
Note
• 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.
• The hollow on the other side of the valve from the hole is a guide for indicating the wear of the rim. If this hollow is no longer visible, the rim is at the end of its useful life.
• 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) are also sold separately. Please ask your bicycle dealer for details.
t
• 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.
Model number
RR-550-WUWSW
RR-550-WUASW
RR-317-WUASW
Specification
CPSC
AS
DIN
Coloer
White
Amber
Amber
• Parts are not guaranteed against natural wear or deterioration resulting from normal use.
In order to realize the best performance, we recommend that the following combination be used.
Applicable tire size
Wheel
Chain
Cassette sprocket
10-speed
10-speed
Clincher tire
700C (19C - 28C)
Tubular tire
700C (19mm - 25mm)
WH-7800
CN-7800
CS-7800
Specifications
Model number
Speeds
Rim size
Applicable tires
Applicable spoke length
Rim width
Clincher
Tubular
For front
For rear
WH-7800
10
700C
X
X
280mm
274mm / 300mm
20.8mm
Replacing the spokes
Hook the spoke through the rim as shown in the illustration.
(The illustration shows clincher tire specifications.)
Spoke
Rim
Spoke lacing
Lace the spokes as shown in the illustration.
(For front)
At the front, a radial assembly is used at both the left and right
(For rear)
For front
980-1400N
(220-315Ibf)
Spoke tension value
For rear
Right (sprocket) side
1000-1600N
(225-360Ibf)
Left side
600-1100N
(135-247Ibf)
*These values should be used as a guide only.
Installation of the HG sprockets
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.
Wide part
A ac-14T
• 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-
SR20 to remove the lock ring.
Install the TL-SR20 to the largest sprocket.
Lock ring
Tool
(TL-SR20)
TL-LR15
The groove is wide at one place only.
Tightening torque:
30 - 50 N·m
{261 - 434 in. lbs.} Disassembly
Sprocket spacers Lock ring
Replacement of the freewheel body
• 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.
Hub axle
Freewheel body
Spacer
Freewheel body fixing nut
Assembly
Disassembly
Tightening torque:
10 - 15 N·m
{86 - 130 in. lbs.}
5mm Allen key 5mm Allen key
Make sure that the spacer is facing the correct way.
t
