Cannondale Jekyll User manual
Congratulations and thanks for purchasing the world’s newest, most
innovative, and most adjustable full suspension design, the Cannondale
Jekyll. Please take a moment to read and understand this supplement
and the other literature included with the bike, including the Cannondale
Bicycle Owner’s Manual and the HeadShok specific supplement. These
will provide important safety warnings and performance tips which will
make for many miles of safe, high output riding pleasure. If you have any
questions about your frame or the contents of this manual, don’t hesitate
to contact us. See the back page for phone numbers and E-mail contacts.
Your Cannondale Jekyll should have also included a standard owner’s
manual and a front suspension specific manual. If you did not receive
both the Cannondale Bicycle Owner’s Manual and the HeadShok owner’s
manual, please download and print one from the Cannondale website
Tech Center or call our customer service line at 1-800-BIKE-USA in
the U.S. or Canada to have one sent to you.
Please note that this manual is meant to supplement, not to replace, the
Cannondale Bicycle Owner’s Manual. The owner’s manual contains valu-
able information regarding safe operation, adjustment, and maintenance
of your bicycle, as well as more complete warranty information. Please
read the Cannondale Bicycle Owner’s Manual thoroughly before riding
your bicycle, and keep it and this booklet for future reference.
Because the Jekyll bicycles are so unique, there are some important facts
and warnings of which you need to be aware. The warnings are written as
appropriate throughout this manual. Please read and heed all warnings,
the information is here for your benefit.
CANNONDALE®JEKYLLTM OWNER’SMANUAL
2.
JEKYLL FEATURES
The Jekyll pairs one of two lightweight aluminum swingarms with an
all-new welded aluminum front triangle. A threaded, pivoting collar is
used as the attachment point for the rear shock. By threading the shock
absorber fore or aft within the collar, a rider can quickly change the
bike’s geometry and handling characteristics. Positioning the shock
absorber farther forward, for example, lowers the bottom bracket height
and slackens the head and seat tube angles, making the bike perfect
for high speed descending. Threading the shock farther back raises the
bottom bracket and steepens the angles for quicker handling and more
cross-country oriented riding. The shock is also fully adjustable to
positions between the fully forward and fully aft limits, offering an
incredible range of adjustability and ride tuning. The rear wheel
travel on the Jekyll is a full 120mm, regardless of where the shock
is positioned in the collar. Some Jekyll models use Fox rear shocks
equipped with compression adjusters which can be used to stiffen
the rear suspension for a more race-oriented ride.
COMPONENT COMPATIBILITY AND PRECAUTIONS FOR ALL JEKYLL
MODELS
PIVOTING SHOCK MOUNT COLLAR
The Jekyll uses a pivoting collar above the bottom bracket to secure the
rear shock to the frame’s front triangle. The two bolts which secure the
collar to the frame should be kept tight to 150 In-Lbs (17 Nm). If these
bolts are removed, you should apply one drop of Loctite 242 (blue) to
the bolt threads inside the collar before reinstalling and tightening the
attaching bolts. Make sure not to get any Loctite through the collar onto
the shock adjustment threads, nor any on the frame’s pivot bushings.
The frame bushings on which the collar bolts pivot should never be
greased or oiled. They are Teflon®coated and need no lubrication.
Additionally, some lubricants may deteriorate or destroy the coating.
Should your pivot bushings be damaged or wear out, they can
be replaced by your local Authorized Cannondale Retailer.
3.
FORKS
The new Cannondale Jekyll frame is compatible with all in-headtube type
HeadShok forks (such as the Fatty, Fatty Ultra, and Super Fatty) and the
single sided Lefty fork. Using any fork other than those listed here could
lead to frame or fork failure, and will void your warranty.
WARNING: Jekyll frames were not designed to use forks other than those
manufactured, tested, and approved by Cannondale. If you do so you may
break, damage, or shorten the life of the Cannondale frame, with result-
ing risk of injury or death to the rider. If you do so you will also void your
Cannondale frame’s warranty.
HEADSET
The Jekyll’s head tube is designed to accept HeadShok forks and Head-
Shok headset cups only.
FRONT DERAILLEUR
All Jekylls require a standard “bottom-pull”type front derailleur with a
31.8mm clamp diameter. Because the front derailleur mounts to the rear
swingarm, and has a limited range of vertical adjustment, some derailleur
designs (such as Shimano “Top Swing”derailleurs) are not compatible.
CRANKSET / BOTTOM BRACKET
Like all Cannondales, the Jekyll bottom bracket shell is 68mm wide and
has English threads. Proper bottom bracket spindle length depends on
the crankset being used. Use whatever length spindle is recommended
by the crank manufacturer, providing the proper clearance between the
crankarms and the frame is maintained.
CAUTION: DO NOT MACHINE (OR “FACE”) EITHER THE HEADTUBE
OR THE BOTTOM BRACKET SHELL. THESE SURFACES ARE ACCU-
RATELY FACED AT THE FACTORY SO THIS TRADITIONAL FRAME
PREPARATION STEP IS NOT NECESSARY, AND COULD DAMAGE
THE FRAME.
4.
CHAINRING SIZE LIMITATIONS
The design of the Jekyll’s swingarms limit the maximum usable chainring
size to 46 teeth. Use of any larger chainring may damage the swingarm or
result in contact between the front derailleur cage and the large chainring.
SWINGARM PROTECTOR
The swingarm on your Jekyll is made of thin wall aluminum tubing and
some CNC-machined aluminum parts. To protect the CAAD 4 swingarm
(found on some Jekyll models) from damage inflicted by the chain slap-
ping against the chainstay, we have supplied a self-adhesive vinyl pro-
tector for the swingarm. This protector should be applied to the top of the
right (drive side) chainstay, near the chain. Please inspect this protector
frequently. If the protector becomes damaged, abraded, or peels off, it
should be replaced to prevent damage to the swingarm. To obtain a new
swingarm protector, see an Authorized Cannondale Retailer. The elevated
(bonded) swingarm found on other Jekyll models doesn’t have a tradition-
al “chainstay”, but the protector can be applied to the bottom of the drive
side to protect the paint from chain slap.
ALTERNATIVE BRAKES
Hydraulic and disc brakes are a popular upgrade on many suspension
bicycles. When selecting a hydraulic brake system for your Jekyll, choose
one that mounts to the frame using only the existing cantilever brake
studs or disc brake caliper mounts. Do not attempt to modify the existing
cantilever brake studs or to clamp, weld, or to in any other way add new
or different mounts for a hydraulic brake or disc brake. Any attempt to
modify the frame, swingarm, fork, or related components will void the
warranty and may weaken or damage the frame. For installation instruc-
tions and other warnings, refer to the literature provided by the brake’s
manufacturer. The mounts on the Jekyll’s swingarm and fork are designed
to fit a CODA Compact Disc Brake caliper. Other brands of disc brakes
which conform to the international mounting standard may fit as well.
MAINTAINING THE APPEARANCE OF YOUR JEKYLL FRAME
To keep your Jekyll frame looking its best, we recommend cleaning it
regularly with mild soap and water. Regular cleaning will minimize the
chances of corrosion. Do not use abrasive cleansers or solvents. Jekyll
frames have a thin coating of clear paint over the whole frame (includ-
ing the decals.) A coating of wax can be applied if desired.
5.
JEKYLL GEOMETRY ADJUSTMENT
The adjustable geometry of the Jekyll frame allows for a maximum head
tube angle of 71 degrees with a corresponding bottom bracket height of
13.5 inches (34.3cm) with the shock threaded fully aft in the pivoting
collar. At the other end of the range of adjustment, the minimum head
tube angle is 69.5 degrees with a corresponding bottom bracket height
of 12.9 inches (32.8cm) with the shock threaded fully forward in the
collar. To most easily adjust the geometry, use the following procedure.
1. Loosen the lockring on the shock body, located just in front of the
frame’s pivoting collar, by turning it counter-clockwise (when viewed
from the front of the bike) using a Park red pin spanner tool.
2. Unscrew and remove the bolt which connects the rear of the shock
to the rear swingarm. This will require a 10mm open or closed end
wrench and a 5mm hex wrench. Once the bolt is removed, pivot the
swingarm down and the rear of the shock up so that the two don’t touch.
3. Spin the shock body clockwise (when viewed from the front of the
bike) within the pivoting collar to steepen the angles and raise the bot-
tom bracket simultaneously, or spin the shock body counter-clockwise
to slacken the angles and lower the bottom bracket simultaneously. You
must position the blue compression lever on Fox FLOAT RC shocks in line
with the shock body to most easily adjust the shock position.
4.Once the shock position is set, align the bolt holes in the rear shock
mount and the swingarm, and reinstall the shock mounting bolt. Using
the 10mm open or closed ended wrench and the 5mm hex wrench,
tighten the shock mounting bolt to 106 In-Lbs (12 Nm).
5. Once the shock is set to the desired position and the swingarm has
been reattached, secure the shock in place by tightening the lock ring
against the pivoting collar using a Park red pin spanner. Tighten the lock
ring firmly to prevent the shock from migrating in the collar’s threads.
6.
NOTE: After making the geometry adjustment, you may want to change
the angle and/or position of your saddle to maintain optimal comfort and
your desired riding position.
CAUTION: IF YOU STEEPEN THE BIKE, MAKE SURE THAT THE FRONT
DERAILLEUR DOESN’T INTERFERE WITH THE CHAINRING TEETH.
SEE THE FOLLOWING PARAGRAPH ABOUT FRONT DERAILLEUR
ADJUSTMENT.
FRONT DERAILLEUR ADJUSTMENT—VERY IMPORTANT!
The Jekyll’s rear suspension design places the front derailleur on the rear
swingarm. This arrangement requires very precise adjustment of the front
derailleur. Additionally, the adjustability of the Jekyll’s geometry means
that the front derailleur adjustment must be checked whenever changing
the rear shock position. The front derailleur should be adjusted with the
shock positioned as far aft as possible. That is, the frame should be at it’s
steepest, tallest position before adjusting the front derailleur. See Fig. 1.
Once the rear shock is set to its most aft position, adjust the front
derailleur so that the derailleur cage is approximately 1mm above the
large chainring when there is no weight on the bike (see Fig. 2). The rear
end of the derailleur cage will rock up and away from the chainrings as
the suspension is compressed or as the geometry is changed to a slacker,
lower position.
The front derailleur can be adjusted to the 1mm clearance above the large
chainring at any point in the range of geometry adjustability. However, if
the geometry is then adjusted to a more steep, tall setup (with the shock
further aft in the mounting collar), the front derailleur will have to be
readjusted or it will catch on the chainring teeth.
CAUTION: IF THE JEKYLL’S REAR SHOCK IS MOVED TO A MORE
REARWARD POSITION IN THE FRAME’S PIVOTING COLLAR, THE
FRONT DERAILLEUR POSITION MUST BE CHECKED BEFORE RIDING.
IF THE FRONT DERAILLEUR CATCHES ON THE CHAINRING TEETH,
YOU COULD DAMAGE OR DESTROY YOUR FRONT DERAILLEUR. YOU
ALSO RISK A SERIOUS CRASH, WHICH COULD CAUSE INJURY OR
DEATH. IF YOU DO NOT UNDERSTAND THE ABOVE PROCEDURE FOR
ADJUSTING THE FRONT DERAILLEUR, PLEASE SEE YOUR
AUTHORIZED CANNONDALE RETAILER.
7.
1mm
Fig.1 ▼
Fig.2 ▲
Note Threads
8.
SHIFTING PRECAUTIONS / CHAIN LENGTH
The chain on a Jekyll must be kept long enough to prevent damage to the
rear derailleur when the rear shock is at its most forward position and the
rear suspension compresses to its full travel with the chain on the large
chainring and one of the larger rear cogs. See Fig. 3 for the correct shock
position in which to set the chain length. Remember that on any bicycle,
the gearing combinations of the smallest front chainring / smallest rear
cog, and the largest chainring / largest rear cog should never be used.
These gear combinations (called “cross chaining”) place undue stress on
the chain, chainrings, derailleurs, and rear cogs. Duplicate or similar gear
ratios can be achieved in other combinations using the middle chainring.
CABLE ROUTING
The cables on the Jekyll must be routed correctly to ensure proper oper-
ation of the derailleurs and brakes, and to prevent the cable housing from
being pinched when the rear suspension is compressed. Also, be sure to
use lengths of cable housing which will not impede steering control and
will not contact wheels or tires. Based upon the type of swingarm on the
Jekyll you have purchased, see the appropriate section below for cable
installation instructions.
Fig.3 ▼Note Threads
9.
CAAD4 SWINGARM EQUIPPED JEKYLL
FRONT BRAKE
Run hydraulic line directly from the front brake lever to the front brake.
If equipped with a Lefty, the hydraulic tubing should not go through the
clamps, but rather to the outside of the Lefty leg and behind to the disc
brake. See Fig. 4. Note that the zip tie loops need to be loose enough to
allow the hydraulic brake line to slide freely up and down. If equipped
with a Fatty, Ultra, or Super Fatty fork, the tubing from the front brake
lever should be directed behind the shock boot and down the back of
the left fork leg to the disc brake. See Fig. 5.
Fig.4 ▼Fig.5 ▼
Front
Brake
Line
Front
Brake
Line
10.
REAR BRAKE
Run the hydraulic tubing from the rear brake lever to the lower slots in
the double housing stops on the left side of the down tube. Secure the
hydraulic line in the aluminum guides with the supplied plastic guide
clips. Then run the hydraulic line outside the vertical strut and under
the clamp just above the swingarm pivot (see Fig. 6). The tubing
should then be run directly to the rear brake, inside the seat stay.
FRONT DERAILLEUR
Run cable housing from the front shifter to the housing stop on the right
side of the downtube. Run exposed cable to the housing stop a the lower
end of the downtube. Run cable housing (approx. 32cm.) from this down-
tube stop, under the bottom bracket, and to the housing stop on the
swingarm just behind the rear suspension pivot. Be sure to leave enough
slack in this piece of housing to allow for the movement of the swingarm.
It is easiest to first position the housing into the stop on the swingarm,
and then to run the cable through the housing and out the hole towards
the front derailleur.
Fig.6 ▲
Rear Brake
Rear Derailleur
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