96
97
PART II
STEERER TUBE
HEADTUBE
STEM
2 - 3 mm
HEADSET TOP CAP
HEADSET SPACERS
48 mm
Do not grease.
MAXIMUM STACK HEIGHT
Measure from the top edge of the
headtube to the bottom edge
of the stem.
55mm
EXPANDER BOLT
TOP CAP
EXPANDER
EXPLODED VIEW
Top cap at
upper stem bolt
Expander at
lower stem bolt
INSTALLED CORRECTLY
KP017/
6Nm, 53InLbs
REV. 1
4Nm, 35InLbs
REV. 2
SI Compression Assembly KP017/ Instructions
The following procedure should only be completed by a professional bike mechanic.
1. Assemble the fork, headset, spacers, and stem without tightening the stem bolts onto the head tube.
When the system is assembled, the carbon steerer tube should be 2-3 mm below the top stem. All spacers
must be located below the stem and within the maximum stack height as shown. No spacers may be
used above the stem.
2. Set-up the compression assembly before inserting it. Adjust the length so that the expander is located at
lower stem bolt. The top cap and the expander end provides critical support to the carbon steerer when
tightening the stem bolts. Adjust the length by threading the top cap on the expander parts.
3. When the assembly is the correct length, insert it into the steerer tube. It is designed to fit snugly inside
the steerer. Insert an Allen key through the access hole in the TOP CAP and into the EXPANDER BOLT.
Tighten the to the specified torque.
4. Now, to set bearing preload, insert a 6mm allen key into the hex shape in the TOP CAP itself. Turn the
entire top cap clockwise to increase preload. Turning it counter-clockwise will decrease the preload. When
the headset preload feels correct, turn the stem to align the handlebar and tighten the stem fork clamp
bolts to the torque specified for the stem. Consult the stem manufacturer’s instructions. The torque
values for components are often marked on the part.
