A = 2 - 3 mm
Al
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A = 1 mm
C
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5
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3
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A
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C
EN // OWNER’S MANUAL
STEM // PROD. CODE: 1735246
Installing the stem
1. Slide the stem onto the steerer tube and align it with the front wheel.
2. On forks with carbon steerer tube: Slide a spacer (fig. B/3) with a height of at
least 5 mm on the stem.
3. Put the top cap (fig. A, B, C /2) on the stem and tighten the headset adjustment
bolt (fig. A, B, C /1) down all the way, but leave it loose.
4. Install handlebar and handlebar clamps and tighten the upper clamp bolts
with washers (fig. D/1) just enough so that the bar can still be moved.
→
The stem clamp is built asymmetric and needs to be installed in such
a way that the white dots on the clamp or the convex end are pointed
upwards (fig. D).
5. Centre the bar and adjust it to the desired angle. Please note the handlebar
manufacturer’s instructions!
6. Tighten the upper bolts (fig. D/1) to a torque of 5 Nm.
7. Screw the lower bolts with the washers (fig. E/1) and tighten them to a
torque of 5 Nm. Check the handlebar manufacturer’s manual for different
requirements regarding the maximum torque.
8. Adjust the headset play: Tighten the headset adjustment bolt (fig. A, B, C/1)
until there is no play in the headset. Please note the headset manufacturer’s
instructions!
9. Tighten the bolts that attach the stem to the steerer tube (fig. C/5) equally a
little bit at a time until you’ve reached a torque of 5 - 7 Nm. Check the fork
manufacturer’s manual for different requirements regarding the maximum
torque.
Maintenance and Care
Regular care and maintenance ensure high durability and reliability, as well as
unlimited functionality. ROSE Bikes recommends carrying out the following tasks:
• Check bolts for proper torque regularly and tighten them to the required
torque, if need be.
• Regularly clean the stem with a gentle cleaning agent. Pay attention to the
notes and recommendations for use printed on the respective cleaner.
• Regularly check the stem and bolts for damages, such as cracks,
deformations and corrosion, and replace the stem, if need be.
This manual is also available on rosebikes.com/manuals.
General information / Safety
Please read this manual carefully before taking the first ride with your new stem
and make sure you understand everything. Keep this manual for future reference.
If you sell or give away your stem, please also include the owner’s manual.
A steerer shim adapter (prod. code: 228261901) allows the use of stems designed
to fit steerer tubes with an outer dimension (fig. C/4) of 28.6 mm (1 1/8”) on forks
with a steerer tube outer dimension (fig. C/4) of 25.4 mm (1”). The slot of the shim
should face to the front to prevent any damages to the steerer tube.
The OSC stem clamps are constructed to reach a maximum clamping force with
a minimum of torques. When mounting the handlebar, make sure the clamp is
pointed in the right direction and that you are tightening the upper bolts first.
Intended use
The ROSE OSC stem should only be installed on road bikes and used in their
typical riding environment.
Preparing the stem for installation
1. Install the fork according to the manufacturer’s instructions and cut the
steerer tube down, if need be, by following the manufacturer’s instructions.
The clamp side of the steerer tube should have the following length:
• Forks with aluminium steerer: The steerer tube should be 2 mm to 3 mm
shorter than the top mounted component (fig. A/A).
• Forks with carbon steerer: The steerer tube should be 1 mm longer than
the top of the stem (fig. B/A).
2. Fit the star nut or steerer tube expander into the steerer tube according to the
manufacturer’s instructions. Do not install any star nuts into carbon steerer
tubes!
3. Clean handlebar, steerer tube and stem. Make sure all clamping surfaces
are clean and free of grease! When using a carbon handlebar and/or carbon
steerer tube, apply some carbon friction paste to the clamping surfaces.
4. Loosen the steerer clamp bolts (fig. C/5) two turns.
5. Undo the handlebar clamp bolts (fig. C/3) and remove the handlebar clamps.
DANGER
Risk of accident due to improper installation or handling of the stem!
A proper installation and handling of the stem significantly contributes to the
safety of your bike. Please note:
• The stem should only be installed by people with sufficient expertise and
knowledge. If in doubt, please consult a qualified bicycle mechanic!
• Make sure to tighten all screws to the required torque and additionally
check the manual of the handlebar or fork manufacturer for any deviations!
Especially when using carbon handlebars, the torque indicated by the
manufacturers might be significantly lower.
• After a fall, the stem might have damages that are not externally visible. Ask
a qualified bicycle mechanic to check or – if need be – replace the stem after
a fall!
• Aluminium stems should be replaced after 2 years or 10 000 km, whichever
comes first.
• In case of cracking noises or external damages, such as cracks, deformations
or discolorations, the stem should be replaced or serviced by a qualified
bicycle mechanic.
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