EN // OWNER‘S MANUAL
STEM // PROD. CODE: 1905784 / 2274998
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 steerer.
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 clamp(s). Tighten the upper clamp bolts (fig. D/1) just
enough so that the bar can still be moved.
→
The stem clamp is asymmetric and should be positioned with the white spot on
the clamps or with the convex part pointing upwards (see fig. D).
5. Centre the bars and adjust them to the desired angle. Please note the handlebar
manufacturer’s instructions!
6. Tighten the upper clamp bolts (fig. D/1) to a torque of 5 Nm.
7. Tighten the lower clamp bolts (fig. E/1) to a torque of 5 Nm. Please check the
handlebar manufacturer’s manual for any other specifications 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. Please check the fork
manufacturer’s manual for any other specifications 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 like cracks, deformation and
corrosion and replace the stem, if need be.
This manual is additionally available as a pdf file 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: 522566) allows the use of stems designed to fit
steerer tubes with an outer dimension (fig. C/5) of 28.6 mm (1 1/8”) on forks with a
steerer tube outer dimension (fig. C/5) of 25.4 mm (1”). The slot of the shim should face
to the front to prevent any damages to the steerer tube.
The clamps of OSC stems are designed to achieve maximum clamp force with
minimum torque. Make sure to properly align the clamps and tighten the upper clamp
bolts first when installing a handlebar.
Intended use
The ROSE Race Attack OSC stem is designed for use on road bikes, cyclocross bikes,
mountain bikes and touring bikes. The stem must not be used for extreme riding with
jumps higher than 60 cm, in extremely steep and demanding terrain or for downhill or
freeride riding.
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/6) two turns.
5. Undo the handlebar clamp bolts (fig. C/4) and remove the handlebar clamp(s).
DANGER
Improper installation or handling of the stem may cause accidents!
A proper installation and handling of the stem significantly contributes to the safety of
your bike. Please note the following points:
• The stem must 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 or forks with a carbon steerer, 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 must be replaced after 2 years or 10 000 km, whichever comes
first.
• In case of cracking noises or external damages like cracks, deformations or
discolorations, the stem must be replaced or serviced by a qualified bicycle
mechanic.
A
B
C
A = 2 - 3 mm
Al
1
22
A = 1 mm
C
1
2
3
5
1
3
3
2
4
1
1
1
D
E
