Cervélo ST029 User manual

2019 S3 STEM GUIDE

2019 S3 ST029 STEM
80mm ST-A029-80
90mm ST-A029-90
100mm ST-A029-100
110mm ST-A029-110
120mm ST-A029-120
130mm ST-A029-130
Preload
Screw
M5 x 100mm
Preload Insert
Cervélo ST029 Stem ST029 Stem
Top Cap
STC-A029
Tighten stem faceplate
bolts to 6Nm.
Lightly grease
and tighten to
1-2Nm.
ST029 is compatible with the
Bar Fly 4 Direct Max and Bar
Fly Direct Mini Garmin stem
mounts.
NOTE: Maximum stem stack
adjustment is 40mm. This
requires the use of all
seven 5mm Stem Spacers plus
the two 2.5mm Stem Spacers.
0mm stack
No Stem Spacers
40mm stack
5mm Stem Spacers x7
2.5mm Stem Spacers x2
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The ST029 stem must be used in conjunction with the
HS-A029 Headset and HS-A029 Stem Spacer Kit.
Do not place 2.5mm
spacers directly under
the stem as it will
interfere with headset
adjustment.
Do not stack 2.5mm
spacers directly on
top of each other as it
will interfere with
headset adjustment.

ST029 STEM CUTTING INSTRUCTIONS
100mm
Stem Cut Calculator
Cut Line
Max. 25mm
With 48cm and 51cm S3 Disc frames, the stem steerer will
need to be cut to place the stem in the lowest stack
position. Stems for size 54cm to 61cm frames do not
require cutting.
Use a light coloured grease pencil to accurately mark the
cut-off location on the stem steerer from 5mm to 25mm
off the bottom edge. See the table below for the exact
number based on the combination of frame size and
desired spacer stack.
Insert the ST029 in the Park Tool SG-6 Saw Guide (or
equivalent) so that the cut-off line can be seen clearly
through the blade guide in the tool.
Using a blade designed specifically for cutting metal;
proceed with cutting the stem steerer (as per Park Tool’s
instructions).
Carefully file the cut end removing any burrs, adding a
radius to both the inside and outside of the cut edge.
1.
2.
3.
4.
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If the stem steerer is cut to achieve
a lower position, the minimum
insert line on the stem steerer must
be moved up by the same amount
to ensure proper clamping.
The stem steerer must not bottom
out/contact the tapered portion of
the fork steerer. Damage to the
fork or the brake hose caused by
the stem steerer could result in a
loss of control while riding and
potentially serious injury.
Ensure inside and outside of cut
edge is smooth and free of fork
damaging burrs. Damage to the
fork or the brake hose caused by
the stem steerer could result in a
loss of control while riding and
potentially serious injury.
Frame Size*48cm51cm
Spacer Stack (mm)Removed Length of
Stem Steerer
Resulting Max Spacer
Stack Possible
Removed Length of
Stem Steerer
Resulting Max Spacer
Stack Possible
0mm (slammed)25mm15mm 5mm 35mm
5mm20mm20mm0mm 40mm
10mm 15mm25mm0mm 40mm
15mm 10mm30mm0mm 40mm
20mm 5mm 35mm0mm 40mm
25mm 0mm 40mm 0mm 40mm
30mm 0mm 40mm 0mm 40mm
35mm 0mm 40mm 0mm 40mm
40mm (maxallowable) 0mm 40mm 0mm 40mm
*Size 54cm frames & above required no Stem Steerer cutting.