BMC Trailsync Guide

Trailsync
Lockbody replacement

Trailsync
Lockbody replacement
Contents
1. Tools necessary 3
2. Replacement part kit 4
TRAILSYNC – Lockbody replacement

1. Tools necessary:
Work Stand:
Allen Keys:
Torque Wrench:
Cable Cutter:
10 – 20 Minutes
Shifter Cable:
TRAILSYNC – Lockbody replacement

2. Replacement part kit
1
2
3
4
5
Part N°301221 –
Trailsync lockbody kit
Pin
Lockbody
M5x 12
Spring
M5x 14
1
3
5
2
4
TRAILSYNC – Lockbody replacement

1
3
2
4
1 Don’t release air pressure
in the dropper post, the Lock-
body replacement will
be easier.
2 Loosen the grub screw on
the Trailsync lever and remove
lever.
3 Pull back the cable housing
2 - 3 cm.
4 Loosen the screws on the
lockbody cover and remove it.
TRAILSYNC – Lockbody replacement

7 8
5 6
5 Loosen the three lock body
screws.
7 Replace old Lockbody with new
version.
6 Remove the Lockbody
by pushing it slightly back.
Remove inner wire.
8 Grease and reassemble the pin
& spring.
OLD NEW
New: Recess for
cylinder head bolts
TRAILSYNC – Lockbody replacement

109
9 Assemble a new derailleur cable
with the pin and spring in the
Lockbody. The parts need to be
greased well.
10 Push the inner cable in the
casing.
Don’t push it through completely
yet.
TRAILSYNC – Lockbody replacement

11
12
13
11 Lower the seatpost 1-3mm
while bringing the Lockbody
into position.
12 The Lockbody will latch into
the notch of the seatpost.
M5 x 12 sunk head bolt
NEW:
M5 x 14
cylinder
head bolt
13 Fix the Lockbody with the
3 screws (coat with threadlocker).
Gradually tighten the screws
alternating: 2 Nm > 4 Nm > 6 Nm.
Final torque: 6Nm.
TRAILSYNC – Lockbody replacement

14
15 16
14 Pull cable through casing.
Push the casing in the Lockbody.
Notice:
The screws must be coated
with threadlocker.
15 Install the Lockbody cover.
16 Push it to the rear while
tightening the screws.
Notice:
The screws need to be
greased.
TRAILSYNC – Lockbody replacement

17
19 20
18
17 Pull on the cable while the lever
base sits firm on the remote lever
body.
Tighten the grub screw.
18 Cut off the cable ~10mm after
the lever base.
19 Connect the lever with the base
by sliding it over the cable.
20 Check function.
Increase tension if needed.
TRAILSYNC – Lockbody replacement