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.
www.cervelo.com
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.
