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FORK INSTALLATION
S120 forks with carbon steerer tubes are specifically designed for the Stumpjumper and
Safire carbon OEM frames with a 1 1/2” (52mm) lower bearing and a 1 1/8” (42mm) upper
bearing. Each steerer tube is already cut to fit the specific frame size it was paired with.
In the event that the fork steerer tube needs to be cut down further or any maintenance
needs to be done to the fork, please read the following instructions. If you have any
doubt regarding your mechanical ability and/or installation of this product, visit your
local authorized dealer. Specialized recommends that the stem be installed on the fork
using a torque wrench, by a qualified mechanic.
PREPARING THE COMPONENTS
PRE-INSTALLING THE FORK
Warning! Recommended torques in this guide are specific for this
Specialized product. Consult the owners manual for the mating component’s
recommended torque. Always use the lower torque recommendation.
Warning! Burrs and sharp edges can damage the carbon and alloy surfaces of
the components. Any deep scratches or gouges in the stem or fork can weaken
the components resulting in failure, causing serious personal injury or death.
1. The lower bearing race is permanently pre-installed at the factory. Apply a small
amount of grease to the lower bearing race surface. Avoid getting grease on the
stem interface region of the steerer tube.
2. Install the bearings in the head tube, with a light coat of grease on the bearing
surfaces. The bearings are friction fit and can be installed by hand.
3. Place the fork in the frame, followed by the headset compression ring, headset top
cap and the desired height of carbon cone and/or headset spacers.
NOTE: Do not install more than 40mm (1.5”) stack height of headset spacers.
Exceeding this limit can compromise the strength of the steerer tube (See fig.1).
NOTE: Clean the stem interface surface of the steerer tube (above the headset spacers)
with isopropyl alcohol or a similar type of degreaser before installing the stem.
4. Pre-install the stem (do not apply a high torque without the 48mm Long Expander
Plug installed).
NOTE: Unless the desired stem height is already determined, it is recommended that
the pre-installation of the fork and stem be done with the maximum allowed stack
height (40mm) to allow the greatest range of adjustability. Spacers can be placed
above or below the stem to adjust your position. Once a more precise stem height is
determined, a second cut can be made to eliminate any spacers that may have been
placed above the stem to achieve the desired position.
Inspect the fork and stem to ensure that there are no burrs or sharp edges that can
damage the surface in contact with each other. Remove any burrs or sharp edges using
fine grit sandpaper. All edges in contact with the steerer tube should be rounded out
to eliminate any stress points.
NOTE: Specialized only recommends external slotted clamp style stems. Internal
wedge clamp style stems can damage the steerer tube if improperly installed. (fig.1)