Congratulations! You have just purchased what many people regard as the best headset in the world.
Since 1976 Chris King has been supplying cyclists with the best made, most reliable headsets you can
buy. With proper installation and maintenance you can expect to enjoy many years of the legendary
quality and performance built into each and every component we make.
Compatibility
See the DropSet
™
Specications table for required headtube dimensions. Do not attempt to modify a
different style headtube to t this dimension. Contact the bicycle frame manufacturer or an authorized
Chris King dealer to verify frame compatibility.
Installation
We recommend that the headset installation procedure be performed by a professional bicycle mechanic.
Note: It is important that the supplied Chris King DropSet™ bearing cap assembly is used
with the DropSet™ bearings to ensure the longest lasting, and best performing headset.
Preparation of Frame
Check t of bearings into frame. Clean bearing bores in frame to remove any grit or debris. Bearings
should install into the upper and lower bores of the headtube using only light hand pressure, at most. If
the bearings do NOT install easily then consult with Cris King Precision Components. Metal bearing seats
may need to be reamed and faced using appropriate tools.
CAUTION: An improperly reamed headtube may cause frame failure, loss of control of the
bicycle while riding, serious injury or death.
Installation of Bearings into Frame
Install upper bearing by simply tting the bearing into the clean and lightly greased headtube. Please refer
to the orientation diagram for proper orientation of the bearing. Repeat process for the lower headset
bearing.
Preparation of Fork and Installation of Baseplate
Proper preparation of the fork is essential for the best headset performance.
1. See table for crown seat outer diameter (OD) specications. The baseplate press t onto the fork
should have no more than 0.1mm, (0.004”) of interference.
2. Clean the baseplate (crown race) seat area by removing any chips, shavings, and/or cutting oil.
3. Slide the baseplate, conical side up (marked “This Side Up”), onto the fork steer tube. With the
beveled side of the Chris King baseplate installation adapter against the baseplate, use a crown race
setting tool to set the baseplate.
Note: It is important to use the King baseplate (crown race) supplied with the DropSet™
bearings unless the fork has an integrated crown race with a 45 degree bearing seat.
Cutting the Steerer Tube
Use extreme caution when cutting steerer tube to avoid injury.
1. Insert fork, with base plate installed, into frame.
2. Slide GripLock™ cap assembly, then spacers (if needed), and then the stem over steerer tube.
Scribe a line ush with top of stem.
3. Remove items from steerer tube and mark another line 3 mm below the rst line. Cut on the lower
line using a hacksaw and saw guide.
4. Remove all sharp edges from inside and outside of steerer tube. With a le or sandpaper, round
outside edge of tube to avoid shearing GripLock™ cap O-ring upon installation.
Installation of Star Nut
For forks with Carbon steerers please refer to the Fork Manufacturers instructions re-
garding pre-load devices.
1. Thread star nut on to the star nut installation tool.
2. With a soft hammer or mallet, drive star nut straight into steer tube until tool contacts top of steerer
tube. Unscrew tool from star nut.
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