HOW THE THUDBUSTER SEATPOST WORKS
The Thudbuster seatpost is a four-bar linkage suspension. The cradle, to which
the saddle is fixed, travels in a rearward arcing motion while maintaining the
saddle’s proper orientation. This system eliminates the stiction normally experi-
enced with telescoping seatposts. The telescoping seatposts move the saddle
down and forward rather than the more natural down and rearward motion
afforded by the Thudbuster.
The heart of the Thudbuster’s design is a stack of two elastomers that provide
both the spring and damper components. While the damping is not indepen-
dently adjustable, the elastomer set provided with the Thudbuster enable five
different spring rate settings to finely tune the post to your weight and riding
style.
INSTALLATION
1. Note your current saddle height and fore/aft position to duplicate it with the
THUDBUSTER.
2. Remove your current saddle and seatpost.
3. Confirm your new THUDBUSTER seatpost (or shim) diameter is the same as your
old seatpost. (THUDBUSTERS are available in (11) direct fit sizes between 25.4
and 31.8 mm.)
4. Grease the shim (if applicable) and seat pillar before installing. DO NOT lubri-
cate seat tubes of Carbon frames (unless specified by the manufacturer).
5. Insert the shim (if applicable) into the bicycle frame with the split facing
rearward.
6. Install the THUDBUSTER into the bicycle frame to approximately the correct
height with the Thudbuster logo on seat pillar facing the front of the bicycle.
7. Attach the saddle with the enclosed clamp kit as shown in the illustration
(middle right) and position to the desired angle and fore/aft position.
8. Tighten the clamp bolt to 10-11 N*m (90-100 in*lb) with the provided 5 mm
hex wrench, ensuring the washer is under the bolt head.
9. Adjust the saddle height if necessary.
SET UP
THUDBUSTER seatposts can be tuned for different weight riders and riding styles
by combining the proper elastomers (spring rate) with the proper amount of
preload (travel initiation load).
SELECTING ELASTOMERS
Start with the minimum elastomer
guideline (left) for average recommen-
dations. THUDBUSTERS are shipped
with 2 each of grey, blue and black
elastomers. You may desire to in-
crease the stiffness by using harder
elastomers. Never use softer elas-
tomers than those recommended for your weight. White elastomers are available
for purchase at www.canecreek.com/store.
THUDBUSTER
Suspension Seatpost Instructions
Total Arc Travel
102 mm (4.0 ")
Resultant Travel
97 mm (3.8 ")
Vertical Travel
75 mm (3.0 ")
1
2
3
4
5
6
7
1
4
10
11
12
14
15
16
2
3
5
6
7
8
9
12
11
13
Clamp nut
Clamp- upper
Saddle rails
Clamp- lower
Cradle
Clamp washer
Clamp bolt
Coupling washer
Elastomer (2)
Lock nut
Steel washer (2)
Nylon washer (2)
Skewer bolt
Arm (2)
Seat pillar
Minimum insert line
(100mm from bottom)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Notice!
The Thudbuster must be set-up with appropriate
elastomers before riding.
Minimum Elastomer Guideline
Under 100
100-120
120-140
140-165
165-190
190-215
215-250
Under 45
45-54
54-64
64-75
75-86
86-98
98-113
White/White
White/Grey
Grey/Grey
Grey/Blue
Blue/Blue
Blue/Black
Black/Black
Minimum Elastomer
Recommendation
Rider Weight
lb
kg
