Felt Compulsion Series Technical Manual

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COMPULSION TECHNICA L MANUAL

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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 .....................................................................................................3 1

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.

Larg e 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

0 40 80 120 160

ANTI-SQUAT

LEVERAGE RATIO

SUSPENSION TRAVEL (MM)

SUSPENSION TRAVEL (mm)

-100%

0 50 100 150

4-BAR SYSTEM

DURING THE D ESIGN PROCESS, O UR ENGINEE RS CAN MOVE THE EQ UILINK MOUNTING POINTS TO BEST CONTRO L THE ROTATION OF THE UPPER AND LOWER LIN KS.

VARIABLE DISTANCE

FIXED DISTANCE

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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

20MM

+ PRESSURE- PRESSURE

GEOMETRY

GEOMETRY IN MIDDLE CHIP POSITION

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

SIZE

TT HORIZ

HT LENGTH

SEAT TUBE C-T

BB DROP

FRONT CENTER

WHEELBASE

STANDOVER

REACH

STACK

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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 por t when it is n ot used

• Two Hole 5 mm x 3mm (CCN09 8YB) This por t

fits a 4 o r 5mm cable or hoses as well as a

E-tube wire.

• Two Hole 5mm (CC N099YB) This Cable por t

fits t wo 4 or 5mm cables or hoses.

LOW SETTING

MIDDLE SETTING

HIGH SETTING

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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

Run cable in front of seat tube pivot

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ORDER 1, 2, 3

REAR BRAKE ROUTING

Run inboard of seatstay

DROPPER POST ROUTING

Cable can be accessed through the BB shell an d down tube cable port t o guide it.

For traditional (left hand) dropper routing use 2-hole 5x3 (CCN098YB) on right side.

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ORDER 1, 2 , 3

REAR SHIFTER ROUTING

You can remove the right dropout pivo t axle to get bet ter access to the shif t housing por t in the chainst ay

REAR BRAKE ROUTING

Cross to right side of down tube

For traditional (right hand rear) brake lever setups, u se the 2-hole 5 mm port (ccn099yb) on the left side

5mm wedgie

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In order to achieve optimum suspension performance, Felt recommends performing

a simple pivot checking p rocedure af ter every 1 00 hours of r iding or annu ally,

whichever comes firs t. If any is sues are discove red, please r efer to the bear ing

removal/installation section or take your bike to the nearest Felt dealer.

Pivot Checking Procedure

1. Check torque on all pivot b olts. If b olts are lo ose, remove, clea n and apply Lo ctite

242, then tighten to correct tor que (see techni cal sect ion for torque v alues).

2. With the s hock installed, app ly pressure ve rtical ly and horizont ally to feel fo r any

play in the pivots. If p lay is discovere d, please refe r to the technic al secti on for

more information and instructions for bearing removal/installation.

3. With t he shock removed, move the sus pension th rough its t ravel. There s hould

be litt le to no resist ance. If there is any resist ance, please refer to the techni cal

section for more information and instructions for bearing removal/installation.

SUSPENSION PIVOT EVALUATION

Move Rear Triangle Through travel.

Before tight ening the BB cab le guide screws , move the suspens ion through it s

entire range of travel to insure smo oth articul ation of the brake and shift cabl es.

REAR SHIFTER ROUTING

Cross to left s ide of down tube

4mm b b reducer

2mm allen wrench

Run shifter c able on the left side of t he head tube

4mm wedgie

5mm bb reducer

(cont.)

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15N-m

LOWER SHOCK MOUNT

Lowe r link PINCH B OLTS

Seat Tu be Pivot

Dropout Pivot

PIVOT TORQUE VALUES

LOWE R LINK Piv ot

SeatStay Yoke PIvot

Upper SHOCK MOUNT

18N-M

16N-M

15N-M

18n-m

13N-M

8N-M

SEAT TUBE PIVOT

SE ATSTAY YO KE PIVO T UPPER SHOCK MOUNT

DROPOUT PIVOT

LOWER LI NK PIVOT S

LOWER SHOCK MOUNT

LOWER LINK PINCH BOLTS

With the sh ock removed, l ift the rear axle up to gain access to the lowe r link pinch bolts. Lo osen both pi nch bolts w ith a T25 Torx wrenc h before remov ing 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

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LOWER LINK PIVOTS

18 N-m

APPLY LOCTITE 242

LOWER LINK PIVOTS

EXPLODED VIEW

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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 int o the bearing.

BEARING REMOVAL

ALTERNATE METHOD

BEARING INSTALLATION

Bearings i n the lower link pivot of the chainstay and t he

seat tube pi vot can be remove d in the same way.

Use a pin drif t and hamme r to gently s trike the inner race

of the beari ng. there are t wo cutout s at each end of t he

bearing support sl eeve to allow acces s to the bearin g

inner race (arrows). Altern ate betwee n each cutout every

few taps to dri ve the bearin g out evenly.

LOWER LINK PIVOTS

SEAT TUBE PIVOTS

19 21

APPLY LOCTITE 242

18 N-m

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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

Squeeze BRTK- 017 to

insert it int o the bearing.

27 27

15 N-m

APPLY LOCTITE 242

Flip chips 12 an d 13 can be subs tituted

for middle ch ips 14 and 15, re specti vely.

See page 6

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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

-005

BRTK

-004

BRTK

-006

BRTK

-005 BRTK

-007

BRTK

-017

EXPLODED

BEARING INSTALLATION

BEARING REMOVAL

BEARING INSTALLATION

SHOCK MOUNT

15 N-m

13 N-m

APPLY LOCTITE 242

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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

Make sure the be aring and too ls

are aligned with the

inboard

face

of the upper link.

BRTK-023 and B RTK-024

will adjus t to the angle d

outboard face of the link.

16 N-m

APPLY LOCTITE 242

AP PLY

LOCTITE

242

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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

Strike end of bo lt with ham mer to

drive bush ing out of link . It may be

neccessar y to clamp lin k in a vise

with a rag or s oft jaws.

Removal procedure is the same for lower links.

Note the orientation

(forward/backwards)

of the equilink when

removing - it i s not

symmetric!

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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

25 x2

30 x2

24 x4

29 x2

23 x2

28 x2

22 x2

27 x2

21 x1

26 x4

20 x2

BEARING KIT

16 x2 17 x1 18 x3 19 x3

15 x214 x213 x212 x2

9 x1 10 x1

11 x2

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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 Mem ber Lower Lin k, Left 1

03 Frame M ember Lower L ink, Right 1

04 Frame Member Equilink 1

05 Frame Mem ber Upper L ink, Left 1

06 Frame Mem ber Upper L ink, Right 1

07 Fram e Member C hainstay Assem bly 1

08 Frame Mem ber Seat stay Assembly 1

09 Pivot Hard ware Lower Sh ock Bolt Custo m Cap Screw, M8 x 1.25 x 56. 3mm 1

10 Pivot Har dware Shock B olt Collet Custom Washer, ID 15 mm x OD22mm x 3.5mm Thick 1

11 Pivot Har dware Seat St ay Pivot Screw Custom B olt, M10 x 1.25 x 18 .5 2

12 Pivot H ardware Flip C hip (Inside) Custom O val Nut, M10 x 1.25 2

13 Pivo t Hardware Fl ip Chip (Outside) Custom Ov al Washer, ID 10mm 2

14 Pivo t Hardware M iddle Chip (Insid e) Cu stom Oval Nut, M1 0 x 1.25 2

15 Pivot Hardware Middle Chip (Outside) Custom Washer, ID 10mm 2

16 Pivot H ardware Lower P ivot Axle Custom Bo lt, M15 x 1.25, 72. 5mm Long 2

17 P ivot Hardware Upper Pivot A xle Custom Bol t, M15 x 1.25, 78.8 mm Long 2

18 Pivot H ardware Col let Cone Custom Was her, ID 15mm x OD22mm x 3.5mm Th ick 3

19 Pivot H ardware Mai n Pivot Spacer Cu stom Washer, ID 15mm x OD20m m x 2mm Thick 6

20 Pivo t Hardwar e Lower P ivot Bear ing Suppo rt Custom Wash er, ID 15mm x OD17.7mm x 34.7mm Thick 2

21 Pivot H ardware Upp er Pivot Bearing Su pport C ustom Spacer, ID 15mm x O D17.7mm x 45mm T hick 1

22 Pivot Har dware Uppe r Shock Bolt Custom Bo lt, M10x1.0, 1 9.5mm Long 2

23 Pivot H ardware Dro pout Pivot Screw Cus tom Bolt, M12x1 .0, 26.5mm Long 2

24 Pivot H ardware Dr opout Pivot Spacer Custom Spacer, 12mm ID x 16 mm OD x 3mm Thick 4

25 Pivot Har dware Lower Li nk Pinch Bolt Torx But ton Head Cap Screw, M5x0 .8x16mm 2

26 Bearin g 3802 LLB Max ID 15mm, OD 24mm, 7mm Wi de 4

27 Be aring 6802 LL B Max ID 15mm, OD 24mm , 5mm Wide 2

28 Bearin g 68012 LLB M ax ID 12mm, OD 21mm, 5 mm Wide 2

29 Bearin g 3801 LLU Max ID 12 mm, OD 21mm, 8mm Wid e 2

30 Bearin g DRF 1017 2R S Max ID 102mm, OD 17mm, 6/ 7mm Wide 2

31 Bear ing JFM1 012-12 ID 12mm, OD 12mm, 12mm W ide 4

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