Felt Compulsion Series User manual

COMPULSION
TECHNICAL
MANUAL
2019 Compulsion Series Supplement Manual_V6_21119.indd 1 2/11/19 9:20 AM

01
COMPULSION
Congratulations on purchasing a Felt Compulsion. As with all of our bikes and
components, our aim is to provide the rider with the best product and riding
experience. Read this manual supplement thoroughly, as it’s to help you set your
bike up correctly, and care for it.
For further information, visit:
FELTBICYCLES.COM
STATS
•Rear Wheel Travel: 165mm.
•Fork: Designed around 170mm fork, compatible with forks up to 180mm.
•Tire size: 27.5x2.6 max
(with proper ISO clearance).
•Bottom Bracket: English Threaded (AKA ‘BSA’ Standard), 73mm wide.
•Headset: Zero Stack 1 1/8-1.5 tapered. FSA calls this ‘no. 57’. Cane Creek calls
this ZS44/28.6 Upper, ZS56/40 Lower.
•Seatpost: 30.9mm diameter. Compatible with internally-routed dropper posts
only.
•Seatpost collar: 34.9mm diameter.
•Rear Axle: 148x12, Syntace standard (12x1.0 thread).
•Rear Shock: 205x65mm Metric standard. Trunnion top, Ø8x30mm reducers
bottom.
•Chainring: 52mm (Boost) chainline. Maximum 38t round, or 36t oval.
•Di2 Compatible: Yes
•Rear Brake: 160mm direct Post Mount.
•1x drivetrain ONLY.
INTRODUCTION CONTENTS
Equilink Explained ................................................................................... 2
Geometry ................................................................................................... 4
SHOCK SETUP............................................................................................... 5
FLIP CHIP ..................................................................................................... 6
HEAD TUBE CABLE GUIDES............................................................................ 7
BOTTOM BRACKET CABLE GUIDES ................................................................ 8
DROPPER POST ROUTING.............................................................................. 9
REAR BRAKE ROUTING..................................................................................11
REAR SHIFTER ROUTING..............................................................................13
SUSPENSION PIVOT EVALUATION ................................................................15
PIVOT TORQUE VALUES ...............................................................................16
LOWER LINK PIVOTS ...................................................................................18
SEAT TUBE PIVOTS ......................................................................................21
SEATSTAY YOKE PIVOTS ............................................................................ 23
SHOCK MOUNTS ......................................................................................... 24
DROPOUT PIVOTS ...................................................................................... 26
EQUILINK PIVOTS ....................................................................................... 28
HARWARE REBUILD KIT .............................................................................30
BEARING KIT .............................................................................................. 30
TOOL KIT .....................................................................................................31
MASTER PARTS LIST .................................................................................. 32
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0302
EQUILINK EXPLAINED
Equilink is a patented 6-bar linkage system that allows our engineers to deliver a
unique ride quality with no compromises. Typical short-link 4-bar systems can be
optimized for bump absorption or efficient pedaling, but not both. The suspension’s
bump performance is dictated by the leverage curve (how much the shock
compresses relative to the rear wheel travel), which is governed by the rotation
of the upper link. The pedaling efficiency is determined by the anti-squat curve,
which is related to the motion of the lower link. When the upper and lower links
are connected through a 1-piece rear triangle (like the image below on the right),
any changes the designer makes to the upper link to optimize the leverage curve
will change the rotation of the lower link, affecting the anti-squat curve. Likewise,
any changes to the lower link to optimize anti-squat will compromise the leverage
curve.
The solution? Connect the upper and lower links with the ‘equilink.’ This allows
our engineers to tune the rotation of the upper and lower links independently, to
optimize both leverage and anti-squat curves. The result is a leverage curve that’s
progressive, providing small bump sensitivity, mid stroke support, and bottom-out
resistance; and an anti-squat curve that provides the appropriate amount of
pedaling support in the beginning of suspension travel (where pedaling occurs),
while limiting pedal kickback on big compressions, keeping things active.
Efficient Pedaling //
To accomplish efficient pedaling,
the suspension is designed with
an ideal amount of anti-squat. A
key benefit of the Equilink is that
it allows for a downward sloping
anti-squat curve which falls off
more rapidly around 60% travel.
This translates to a bike that
pedals well and is able to absorb
bumps at the same time.
Large Impacts // To provide support on large impacts, the bike has a progressive
leverage ratio. This means that the suspension gets progressively harder to
compress as it moves through its travel.
Small-Bump Sensitivity // For small-bump sensitivity, the shock is tuned with very little
compression damping. Because the linkage is providing the pedaling efficiency
and large impact support, the shock can remain active and absorb bumps when
needed. The added benefit of doing this is the shock is not compensating for any
shortcomings of the linkage design, therefore it is not working as hard which leads
to less heat buildup and more consistent performance.
EQUILINK EXPLAINED CONT.
LEVERAGE RATIO
EQUILINK
100%
2.2
2.4
2.6
2.8
3.0
040 80 120 160
ANTI-SQUAT
LEVERAGERATIO
SUSPENSION TRAVEL (MM)
SUSPENSION TRAVEL (mm)
-100%
050 100 150
0%
4-BAR SYSTEM
DURING THE DESIGN
PROCESS, OUR ENGINEERS
CAN MOVE THE EQUILINK
MOUNTING POINTS TO
BEST CONTROL THE
ROTATION OF THE UPPER
AND LOWER LINKS.
VARIABLE
DISTANCE
FIXED
DISTANCE
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0504
SHOCK SETUP
It is very important to have the correct amount of sag so that the suspension can be
in the part of its travel that is most efficient and compliant. Felt recommends starting
at 30% and adding/subtracting up to 5-10% to fine tune to your personal preference.
To measure sag, follow these 4 steps:
1. Push the o-ring to the top of the shock shaft.
2. Sit on the bike with the seat at full ride height to compress the shock. Bounce a
few times, then push the o-ring back to the top of the shaft.
3. Gently get off the bike, taking care not to change the position of the o-ring On
some shock models, the sag gradients will be printed on the shaft. In this case,
simply read your sag percentage as it is printed on the shock shaft. If there are no
sag gradients, measure the distance of the o-ring from the top of the shaft. To
achieve 30% sag, the o-ring should be 20mm from the top of the shaft. If there is
too much sag (>30%) add air pressure, if there is not enough sag (<30%), reduce air
pressure.
4. Repeat process until desired sag is achieved.
CORRECT
NOT CORRECT
OR
20MM
+PRESSURE-PRESSURE
GEOMETRY
GEOMETRY IN MIDDLE CHIP POSITION
I
G
J
D
K
F
C
B
A
E
H
SMALL 16” MEDIUM 18” LARGE 20” EXTRA LARGE 22”
65 65 65 65
74.4 74.4 74.4 74.4
568 597 627 654
90 105 125 150
405 435 470 505
10 10 10 10
433 433 433 433
723 754 788 819
1154 1187 1221 1252
708 722 735 750
405 430 455 475
583 597 615 638
A
B
C
D
E
F
G
H
I
-
J
K
SIZE
HA
SA
TT HORIZ
HT LENGTH
SEAT TUBE C-T
BB DROP
CS
FRONT CENTER
WHEELBASE
STANDOVER
REACH
STACK
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0706
FLIP CHIPS
The Compulsion comes with two sets of pivot hardware for the Seatstay Yoke Pivot
to allow you to change the geometry of the bike. One set, called the “middle chips,”
is drilled with the pivot screw centered. This is the default geometry, as shown in
the geometry chart. The other set is called the “flip chips” and depending on the
orientation in which they are installed, they can raise or lower the BB height by 5mm
and steepen or slacken the head angle by 0.4° from the default geometry.
HEAD TUBE CABLE GUIDES
There are 3 interchangeable cable guides that fit the COMPULSION.
• Blanking plate (CCN096YB) This covers the
cable port when it is not used
• Two Hole 5mm x 3mm (CCN098YB) This port
fits a 4 or 5mm cable or hoses as well as a
E-tube wire.
• Two Hole 5mm (CCN099YB) This Cable port
fits two 4 or 5mm cables or hoses.
LOW SETTING
MIDDLE SETTING
HIGH SETTING
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0908
BOTTOM BRACKET CABLE GUIDES
The bottom bracket cable guide can be adapted to different configurations with rubber
reducers for different sizes of cables. It can also be used as a battery holder.
Wrap zip tie around to
hold battery in place.
Di2 (2mm)
SHIFT (4mm)
BRAKE (5mm)
ORDER 1, 2, 3
DROPPER POST ROUTING
2
1
1
3
Run cable in front
of seat tube pivot
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1110
ORDER 1,2, 3
REAR BRAKE ROUTING
2
1
1
3
Run inboard
of seatstay
DROPPER POST ROUTING
2
3
Cable can be accessed through
the BB shell and down tube
cable port to guide it.
For traditional
(left hand) dropper
routing use 2-hole
5x3 (CCN098YB)
on right side.
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1312
ORDER 1, 2, 3
REAR SHIFTER ROUTING
2
1
1
3
You can remove the right
dropout pivot axle to get better
access to the shift housing port
in the chainstay
REAR BRAKE ROUTING
2
3
Cross to right side
of down tube
For traditional (right hand rear) brake
lever setups, use the 2-hole 5mm port
(ccn099yb) on the left side
5mm wedgie
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1514
In order to achieve optimum suspension performance, Felt recommends performing
a simple pivot checking procedure after every 100 hours of riding or annually,
whichever comes first. If any issues are discovered, please refer to the bearing
removal/installation section or take your bike to the nearest Felt dealer.
Pivot Checking Procedure
1. Check torque on all pivot bolts. If bolts are loose, remove, clean and apply Loctite
242, then tighten to correct torque (see technical section for torque values).
2. With the shock installed, apply pressure vertically and horizontally to feel for any
play in the pivots. If play is discovered, please refer to the technical section for
more information and instructions for bearing removal/installation.
3. With the shock removed, move the suspension through its travel. There should
be little to no resistance. If there is any resistance, please refer to the technical
section for more information and instructions for bearing removal/installation.
SUSPENSION PIVOT EVALUATION
Move Rear Triangle Through travel.
Before tightening the BB cable guide screws, move the suspension through its
entire range of travel to insure smooth articulation of the brake and shift cables.
REAR SHIFTER ROUTING
2
2
3
Cross to left side of
down tube
4mm bb
reducer
2mm allen
wrench
2mm allen
wrench
Run shifter cable on the
left side of the head tube
4mm wedgie
5mm bb
reducer
(cont.)
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1716
15N-m
LOWER SHOCK MOUNT
Lower link PINCH BOLTS
Seat Tube Pivot
Dropout Pivot
PIVOT TORQUE VALUES
LOWER LINK Pivot
SeatStay Yoke PIvot
Upper SHOCK MOUNT
18N-M
16N-M
15N-M
18n-m
13N-M
8N-M
SEAT TUBE PIVOT
SEATSTAY YOKE PIVOT UPPER SHOCK MOUNT
DROPOUT PIVOT
LOWER LINK PIVOTS
LOWER SHOCK MOUNT
LOWER LINK PINCH BOLTS
With the shock removed, lift the rear axle up to gain access to the lower link pinch
bolts. Loosen both pinch bolts with a T25 Torx wrench before removing lower link
axles.
After reinstalling and tightening both lower axles, tighten each pinch bolt to 8 N-m.
Repeat torquing each pinch bolt until neither one moves.
ORDER
C 18 N-m
D 18 N-m
A 8 N-m
B 8 N-m
A 8 N-m
B 8 N-m
PIVOT TORQUE VALUES
A
CD
B
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1918
LOWER LINK PIVOTS
16
18 N-m
18 N-m
20
20
16 26
26
18
19
19
3
18
2
19
19
26
26
APPLY LOCTITE 242
APPLY LOCTITE 242
LOWER LINK PIVOTS
EXPLODED VIEW
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2120
LOWER LINK PIVOTS
BRTK
-006
BRTK
-020
BRTK
-014
BRTK
-011
BRTK
-003
BRTK
-007
BRTK
-004
BRTK
-001
BRTK
-011
BRTK
-014
BRTK
-011
BRTK
-005
BRTK
-017
Squeeze BRTK-017 to
insert it into the bearing.
BEARING REMOVAL
ALTERNATE METHOD
BEARING INSTALLATION
Bearings in the lower link pivot of the chainstay and the
seat tube pivot can be removed in the same way.
Use a pin drift and hammer to gently strike the inner race
of the bearing. there are two cutouts at each end of the
bearing support sleeve to allow access to the bearing
inner race (arrows). Alternate between each cutout every
few taps to drive the bearing out evenly.
LOWER LINK PIVOTS
SEAT TUBE PIVOTS
26
20
26
18 19 21
27 27
17
56
19
APPLY LOCTITE 242
18 N-m
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2322
SEAT TUBE PIVOTS
SEAT TUBE PIVOTS
BRTK
-004
BRTK
-020
BRTK
-003
BRTK
-001
BRTK
-003
BRTK
-019
BRTK
-016
BRTK
-010
BRTK
-005
BRTK
-004
BRTK
-006
BRTK
-014
BRTK
-011
BRTK
-007
BRTK
-014
BRTK
-011
BRTK
-006
BRTK
-005 BRTK
-011 BRTK
-017
BEARING REMOVAL
BEARING INSTALLATION
EXPLODED VIEW
BEARING REMOVAL
SEATSTAY YOKE PIVOTS
SEATSTAY YOKE PIVOTS
5
Squeeze BRTK-017 to
insert it into the bearing.
27 27
21
14
15
28
15 N-m
APPLY LOCTITE 242
11
Flip chips 12 and 13 can be substituted
for middle chips 14 and 15, respectively.
See page 6
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2524
SHOCK MOUNTS
SEATSTAY YOKE PIVOT
BRTK
-003
BRTK
-002
BRTK
-012
BRTK
-010 BRTK
-018
BRTK
-001
BRTK
-023
BRTK
-024
BRTK
-010
BRTK
-013
BRTK
-007
BRTK
-015
BRTK
BRTK
-005
BRTK
-004
BRTK
-006
BRTK
-005 BRTK
-007
BRTK
-017
EXPLODED
BEARING INSTALLATION BEARING REMOVAL
BEARING INSTALLATION
SHOCK MOUNT
SHOCK MOUNT
5
30
30
22
9
10
28
15 N-m
13 N-m
APPLY LOCTITE 242
APPLY LOCTITE 242
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2726
SHOCK MOUNTS
DROPOUT PIVOTS
BRTK
-019
BRTK
-003
BRTK
-010
BRTK
-001
BRTK
-012
BRTK
-010
BRTK
-007
BRTK
-016
BRTK
-005
BRTK
-005
BRTK
-004
BRTK
-006
BEARING INSTALLATION CONTINUED
EXPLODED
BEARING REMOVAL
BEARING INSTALLATION
DROPOUT PIVOTS
DROPOUT PIVOTS
29
23
23
Make sure the bearing and tools
are aligned with the
inboard face
of the upper link.
BRTK-023 and BRTK-024
will adjust to the angled
outboard face of the link.
16 N-m
16 N-m
APPLY LOCTITE 242
APP LY
LOCTITE
242
24
24
24
24
29
29
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2928
EQUILINK PIVOTS
EQUILINK PIVOTS
BRTK
-002 BRTK
-007
BRTK
-012
BRTK
-005
BRTK
-007 BRTK
-009
BRTK
-001
EXPLODED
BUSHING REMOAL
BEARING REMOVAL
CONTINUED
BEARING INSTALLATION
EQUILINK PIVOTS
EQUILINK PIVOTS
5
6
31
31
31
31
31
4
3
2
Strike end of bolt with hammer to
drive bushing out of link. It may be
neccessary to clamp link in a vise
with a rag or soft jaws.
Removal procedure is the same for lower links.
Note the orientation
(forward/backwards)
of the equilink when
removing - it is not
symmetric!
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3130
BRTK
-001
BRTK
-009
BRTK
-013
BRTK
-017
BRTK
-005
BRTK
-002
BRTK
-010
BRTK
-014
BRTK
-018
BRTK
-006
BRTK
-003
BRTK
-011
BRTK
-015
BRTK
-019
BRTK
-023
BRTK
-007
BRTK
-004
BRTK
-012
BRTK
-016
BRTK
-020
BRTK
-024
BRTK
-008
HARDWARE REBUILD KIT TOOL KIT
31 x4
31 x4
25 x2
30 x2
30 x2
24 x4
29 x2
29 x2
23 x2
28 x2
28 x2
22 x2
27 x2
27 x2
21 x1
26 x4
26 x4
20 x2
BEARING KIT
16 x2 17 x1 18 x3 19 x3
15 x214 x213 x212 x2
9x1 10 x1
11 x2
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3332
PLEASE NOTE
Felt offers a bearing rebuild kit as well as a complete hardware rebuild kit.
there is also a tool kit for proper removal and installation of the bearings. the
contents of each are displayed in the previous pages. individual parts may also be
ordered. contact your local dealer for more information.
MASTER PARTS LIST
01 Frame Member Front Triangle 1
02 Frame Member Lower Link, Left 1
03 Frame Member Lower Link, Right 1
04 Frame Member Equilink 1
05 Frame Member Upper Link, Left 1
06 Frame Member Upper Link, Right 1
07 Frame Member Chainstay Assembly 1
08 Frame Member Seatstay Assembly 1
09 Pivot Hardware Lower Shock Bolt Custom Cap Screw, M8 x 1.25 x 56.3mm 1
10 Pivot Hardware Shock Bolt Collet Custom Washer, ID 15mm x OD22mm x 3.5mm Thick 1
11 Pivot Hardware Seat Stay Pivot Screw Custom Bolt, M10 x 1.25 x 18.5 2
12 Pivot Hardware Flip Chip (Inside) Custom Oval Nut, M10 x 1.25 2
13 Pivot Hardware Flip Chip (Outside) Custom Oval Washer, ID 10mm 2
14 Pivot Hardware Middle Chip (Inside) Custom Oval Nut, M10 x 1.25 2
15 Pivot Hardware Middle Chip (Outside) Custom Washer, ID 10mm 2
16 Pivot Hardware Lower Pivot Axle Custom Bolt, M15 x 1.25, 72.5mm Long 2
17 Pivot Hardware Upper Pivot Axle Custom Bolt, M15 x 1.25, 78.8mm Long 2
18 Pivot Hardware Collet Cone Custom Washer, ID 15mm x OD22mm x 3.5mm Thick 3
19 Pivot Hardware Main Pivot Spacer Custom Washer, ID 15mm x OD20mm x 2mm Thick 6
20 Pivot Hardware Lower Pivot Bearing Support Custom Washer, ID 15mm x OD17.7mm x 34.7mm Thick 2
21 Pivot Hardware Upper Pivot Bearing Support Custom Spacer, ID 15mm x OD17.7mm x 45mm Thick 1
22 Pivot Hardware Upper Shock Bolt Custom Bolt, M10x1.0, 19.5mm Long 2
23 Pivot Hardware Dropout Pivot Screw Custom Bolt, M12x1.0, 26.5mm Long 2
24 Pivot Hardware Dropout Pivot Spacer Custom Spacer, 12mm ID x 16mm OD x 3mm Thick 4
25 Pivot Hardware Lower Link Pinch Bolt Torx Button Head Cap Screw, M5x0.8x16mm 2
26 Bearing 3802 LLB Max ID 15mm, OD 24mm, 7mm Wide 4
27 Bearing 6802 LLB Max ID 15mm, OD 24mm, 5mm Wide 2
28 Bearing 68012 LLB Max ID 12mm, OD 21mm, 5mm Wide 2
29 Bearing 3801 LLU Max ID 12mm, OD 21mm, 8mm Wide 2
30 Bearing DRF 1017 2RS Max ID 102mm, OD 17mm, 6/7mm Wide 2
31 Bearing JFM1012-12 ID 12mm, OD 12mm, 12mm Wide 4
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