Instructions for C50 Internal Gear Hubs
3810.0405.027 © April 2016 by Sun Race Sturmey-Archer Inc.
1. GENERAL INFORMATION
1.1 Scope of this leaflet
Congratulations on your purchase of a Sturmey-Archer
internal gear hub. For the best performance, please follow
instructions in this leaflet. Please contact your local
Sturmey-Archer dealer if any problems are experienced with the
product.
Riding the gear hub out of correct adjustment may cause
damage to the internal parts and possible malfunction.
1.2 Lubrication
No routine lubrication is required. During a major service,
the hub greases should be replenished or replaced especially for
transmission parts of the hub. Please contact your
Sturmey-Archer dealer who is equipped to carry this out.
Under no circumstances should any lubricant be applied to
the brake drum or drum brake shoes, as this may prevent
the brake from functioning.
1.3 Gear changing
Ease pedaling and select the gear required. If the bicycle is
stationary simply select the gear required.
1.4 Gear ratios
Sturmey-Archer C50 5-speed hub gears have the following
ratios:
1
st
gear 0.64 2
nd
gear 0.8
3
rd
gear 1.0 4
th
gear 1.25
5
th
gear 1.56
1.5 Brake operation
To activate the brake, pull the appropriate brake lever on
the handlebar. If the brake is rubbing or cannot be locked by a
full application of the lever, then brake adjustment is necessary
(See section 5).
2. SHIFTER INSTALLATION
(1) Select 5th gear. Position the shifter onto the right side of the
handlebar. Ensure enough space is left to fit the end grip
and leave a 0.5mm space between the two sleeve spacers
and the end grip.
(2) Fix the twist shifter using a 3mm Allen key to tighten the
clamp bolt to a torque of 2 - 3 Nm. Mount the end grip and
leave a gap to allow free rotation.
(3) Pass the inner cable into outer casing and connect to the
gear hub (See section 3).
◆Note: Avoid sharp bends and kinks in the inner cable.
(4) Readjust the relative position between the brake lever and
the shifter to allow optimum function.
3. GEAR HUB INSTALLATION
3.1 RXL-RD5 and RX-RD5 with drum brake.
(1) Fit the dust cap (1), sprocket (2), and circlip (3) onto the
driver.
(2) Align the red mark and then fit the fulcrum lever (4)
◆Note: There are three ways of fitting, depending upon type
of fork ends.
S
R
S
V
R
V
S
R
R
S
V
V
(3) Fit the C-clip (5)
(4) Place the chain around the sprocket and put the hub axle
into the fork ends.
(5) Fit the lock-washer (6) and dome-nut (7) on the left of the
axle. Screw the nut finger tight.
(6) Fit brake arm into brake clip (8) with nut and bolt. Do not
tighten at this point. (RX-RF5 and RX-RK5 skip this
step.)
Fit proper lockwashers according to dropout type.
(7) Locate the lock-washer (6) and dome-nut (7) on the right
side. Do not tighten axle nuts at this point. Align the
(1)
(2)
(3)
(5)
(6)
(7)
(8)
Reversed
Standard
Vertical
(4)
(4)
(4)
Reversed
Vertical
Standard
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