by.schulz Stem Alpha 35 SDS Installation instructions

Stem Alpha 35°
www.byschulz.com
M-SA-20230316-EN / AN-12085
Safety Instructions:
1. This manual contains important information regarding the
proper installation, use and maintenance of the by,schulz Stem Alpha
35° SDS. Take the listed warning and safety instructions seriously.
Failure to do so may result in damage and personal injury for which
the seller or manufacturer is not liable.
2. The installation is easily possible on bicycles and e-bikes, provided
that the installation requirements are met. If you do not have the ap-
propriate expertise, we strongly recommend installation by a dealer.
3. Child seats must not be attached to the stem or handlebars, as this
can lead to breakage or damage. Handlebar bags or baskets can be
installed, but may not weigh more than 8 kg including load.
4. To avoid further risks of accidents after a fall, which was accompa-
nied by damage to the component, the stem must be replaced
5. We strongly recommend that you check your bike in general, and
the operational safety of the Stem Alpha 35° SDS in particular, before
each ride. Make sure that the stem is aligned parallel to the front
wheel and is rmly tightened or free of play.
1. USAGE APPROVAL
The Stem Alpha 35° SDS is designed to be used with bi-
cycles, cargo bikes, pedelecs and e-bikes up to 45 km/h. It
is NOT suitable for extreme loads in downhill, dual slalom
or free riding. It is NOT suitable for extreme loads that oc-
cur during downhill, dual slalom or freeriding or for riding
proles with jumps.
The 3D forged aluminium A-head Stem Alpha 35° SDS has
been tested and approved according to the following DIN
standards:
2. SCOPE OF DELIVERY
· 1 1/8“ A-Head Stem Alpha 35° SDS
· A-Head adjusting screw
· Design spacer
· Compact instructions
3. TECHNICAL DATA
· 1 1/8“ A-Head Stem
(No A-head cap required due to design)
· Handlebar clamp: ø 31,8 or 35mm
· with SDS Front Cap for SDS Links/Adapter
·Material: Aluminium AL-6061-T6, 3D forged
· Angle: 35°
· Color: black anodized
· Installation height: approx. 125mm at 95mm length
· Weight: from 270g
· Lengths: 80 / 95 / 110 mm
SDS SYSTEM
All by,schulz stems are tted with the SDS / Stem Docking Sys-
tem front cap installed, which was also developed by by,schulz.
Using a variety of SDS links and SDS adapters allows a simple
and stable mounting of accessories, individually or in combi-
nation, such as headlights, GPS, action cam, bottle cage, etc..
by,schulz GmbH
Bühler Str. 121
D-66130 Saarbrücken
GERMANY
Tel : [phone]
Fax : [phone]
[e-mail]
www.byschulz.com
www.byschulz.com
www.youtube.com
SDS
Stem Alpha 35°
Stem Alpha 35°
Compact Instructions by,schulz Stem Alpha SDS
COMPACT
INSTRUCTIONS
8. COMPONENTS (exploded view)
1. A-Head screw with M6 thread - Torx T25 and washer
2. Stem (3D forged aluminium)
3. 2x clamping screws M5 x 16 with washers
Torx T25 or Allen key 5 mm
4. 2x Cross nut bolt M5 thread (stainless steel)
5. Design spacer (glass ber reinforced plastic)
6. SDS front cap tapered (3D forged aluminium)
7. 4x screws M5 with washers - Torx T25
3
17
4
2
6
5
Operating instructions
available for download:
Installation videos
available under :
EN
by,schulz © 2023
No reprints, translations or copies of any kind allowed without the prior written approval of by.schulz GmbH. Subject to technical alterations, errors
and misprints excepted. Used photos can vary from the original product. by,schulz GmbH, Saarbrücken/Germany

6. INSTALLATION
Before mounting, make sure that all clamping surfac-
es of the stem, fork shaft and handlebars are clean and
free of grease!
6.1 Mounting the stem
1. Loosen the two M5 Torx T25 clamping screws of the
Stem Alpha 35° SDS.
2. Push the Stem Alpha SDS onto the fork shaft end so that
it rests directly on the headset or the spacer ring (Design
Spacer, Riser). When using the Design Spacer, it should be
mounted directly under the Stem Alpha. (Fig. 6.1.1)
Abb. 6.1.1 Abb. 6.1.2
3. The use of the Design Spacer is not obligatory and has a
purely optical function.
4. Insert the A-head screw into the A-head claw in the fork
shaft and tighten it slightly.
(Fig. 6.1.2)
5. Align the stem exactly in the riding direction.
6. Adjust the headset by tightening the A-head screw clock-
wise so that there is no play. It must still be possible to turn
the fork easily in the head tube. If the bearing play cannot be
adjusted with the A-head screw, check the fork shaft protru-
sion. (Fig. 6.1.3)
Abb. 6.1.3
7. Tighten the two M5 Torx
T25 clamping screws of the
stem clockwise with a
torque wrench to 7-8 Nm.
8. The stem is now rm-
ly xed on the fork shaft,
check bearing clearance
and alignment of the stem,
correct if necessary. Now
the handlebar assembly
takes place
6.2 Installing the handlebar
1. Loosen the four Torx T25 clamping screws of the SDS
front cap counterclockwise. After removing the screws, re-
move the front cap.
2. Place the clamping area of the handlebar on the clamp-
ing area of the stem eye.
3. Reattach the SDS front cap using all 4 screws.
4. Tighten the top two bolts slightly clockwise so that the
handlebar can be aligned and rotated to the desired grip
position. (Abb.6.2.1)
Abb. 6.2.1
6. If necessary, the grips, brake and shift levers must be
realigned.
7. The Stem Alpha 35° SDS is now ready for use.
7. MAINTENANCE
After the rst assembly of the stem and a short running-in
period of approx. 20 km, check the fork and handlebar
play. Readjust them if necessary. Clean the stem regular-
ly. At every annual bicycle inspection (at least every 1000
km), the play of the headset and Stem Alpha 35° SDS
should be checked professionally.
4. TOOLS
which are needed for the installation:
· Allen key 5 mm
· Torx T25 wrench
· Torque wrench with T25 Torx bit
· Torque wrench with 5 mm Allen key bit
5. INSTALLATION REQUIREMENTS
· A-Head fork shaft 1 1/8“ threadless, outer diameter 28,6 mm.
· The necessary fork shaft protrusion is 38-39 mm.
In combination with the design spacer, approx. 48-49 mm
protrusion is required.
· Spacers/risers can be installed to achieve the correct
projection.
· The threadless fork shaft can be shortened to the cor-
rect length. When cutting, make sure that the fork shaft end
still has an outer diameter of 28.6 mm and has no sharp
edges.
· An A-head claw (starnut) with an M6 thread or a similar
device must be placed in the fork shaft approx. 10 mm be-
low the end of the tube. This is used to adjust the headset
clearance.
· The brake and shift cables, as well as electrical cable
connections to the handlebars, must be of sufficient length
to keep them free of bends and to ensure that they do not
interfere with the steering in any way.
· Handlebar and stem must be compatible with each other
and must have the same clamping diameter of 31.8 mm.
We recommend the use of by,schulz handlebars, as they
are adapted for mounting on the Stem Alpha 35 ° SDS.
5. Then rst tighten the two upper clamping
screws without a gap and then the two lower ones
evenly with a torque spanner to 5-6 Nm (Fig. 6.2.2).
Abb. 6.2.2
Ø 28,6 mm
Design Spacer
Protruding 1 1/8ʻʻ
A-Head fork shaft
Spacer ring
Conical spacer / riser
Headset
Head tube/ Frame
38-39 mm
48-49 mm
with Design Spacer
Head tube
Technical Installation Requirements
Stem Alpha 35°