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Adjusting OSATA
Two Person Technique, Make Frame Larger (cont.)
• Front person: Stand facing the front of the bike.
• Place one hand on the fork blade, the other hand on the
stem riser.
• Using a twisting motion, pull on the bike until it clicks
into the desired position.
Make Frame Smaller
• Same steps as above but push frame parts together
instead of pull apart.
The OSATA uses a unique bearing
preload system that can be adjusted
with or without specialized tools.
The installed system will hold or
secure a headset adjustment, but
you will need either a specialized or
improvised tool to adjust the head-
set preload, for instance if the head-
set adjustment seems loose or overly
tight.
A headset can be adjusted into one
of three states:
Loose When you grasp the front
brake and try to move the front
wheel forward and backward, you
feel “play” or slop in this connec-
tion. This suggests the bearings are
loose.
Adjusting the Headset
Fig. 32 Headset Anatomy.
Locking
Headset
Spacer
Tight While raising the bicycle in the air with the front wheel
lower than the back wheel, very lightly turn the stem to one
side and see if, the stem / wheels returns to the forward
position smoothly. If the stem / wheel’s movement is notchy
and not smooth, the headset bearings are too tight.
Just right No play and rotates smoothly.
Adjusting OSATA: Headset
Tap Adjust Method
(Using
Improvised Tools)
Remove the seatpost from the
seatmast and the seatmast
from the bike and the collar
from the seatmast.
Mechanic’s Tip: Mark the seat-
post (where it enters the seat-
mast) and seatmast (where it
enters the main frame) with a
piece of electrical tape. This
will allow you to re-assemble
the post and mast to the pre-
vious seat height.
Remove the stem riser and O
rings (if applicable) from the
steerer tube, let them hang
beside the bike.
Loosen the locking headset
spacer (note, with this clamp
loose, the fork and headset
can easily fall apart unexpect-
edly.)
It should be just loose
enough to turn with your fin-
gers, but not any looser.
Remove excess space between
the headset pieces. Do this by
lifting the fork a few inches
off the ground with one hand
on the fork leg while the other
hand pushes down on the
headset fixed clamp.
Tighten the locking headset
spacer slightly so there is
some resistance on the bolt,
but not fully tight.
Fig. 33 Seatmast Removal.
Fig. 34 Remove Stem Riser.
Fig. 35 Loosen Locking Headset
Spacer.
Fig. 36 Remove Excess Space.
