Thudbuster LT Instructions
Rev.
6/2009
Cane Creek Cycling Components • 355 Cane Creek Road • Fletcher, NC 28732
ph: 828.684.3551 • fax: 828.684.1057 • web: www.canecreek.com • e-mail: info@canecreek.com
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2
3
4
5
11
12
13
15
18
16
17
9
10
6
7
8
14
13
12
19
1
Barrel nut (2)
2
Upper clamp
3
Saddle rails
4
Lower clamp
5
Cradle
6
Spherical washer (2)
7
Clamp bolt (2)
8
Adjustment knob
9
Seat pillar
10
Minimum insertion line (100mm)
11
Lock nut
12
Steel washer (2)
13
Nylon washer (2)
14
Skewer bolt
15
Arm - LT, right (2)
16
Arm - LT, left (2)
17
Arm bolt, 20mm (6)
18
Coupling washer
19
Elastomer - LT (2)
INITIAL INSTALLATION
1. Note your current saddle height and fore/aft position to duplicate it with the Thudbuste
r.
2. Remove your current saddle and seatpost.
and 31.6 mm.)
4. Grease the shim (if applicable) and seat pillar before installing. DO NOT lubricate seat tubes of
5. Insert the shim (if applicable) into the bicycle frame with the split aligned with the split in the
seat-tube.
6. Install the Thudbuster into the bicycle frame to approximately the correct height with the exten
-
sion marks on seat pillar facing the front of the bicycle.
7. Loosen the two saddle clamp bolts (front and rear) until the threads are barely engaging the
barrel nuts (1 or 2 threads). Be sure grease is applied to the interface between the lower clamp
and cradle.
8. Place one rail of saddle in position between the upper and lower clamps. Then rotate saddle so
the other rail slips over the far edge of the upper clamp and into position in the rail grooves of the
lower clamp.
9. Begin to tighten the front and rear clamp bolts. The saddle tilt adjustment is controlled by these
two bolts. Check that the saddle tilt and fore/aft position of
tightening. The front bolt can be adjusted by hand or hex wrench, but the rear bolt must be tight
-
ened to 60 in*lb (6.8 N*m) with a 4 mm hex wrench. Be sure all the components of the clamp are
installed as shown in section view. (Figure 1)
10. Adjust the saddle height if necessary.
NOTICE! The Thudbuster must be set-up with appropriate elastomers before riding (See below).
Maximum allowable rider weight is 250 lb (115kg).
SELECTING ELASTOMERS
The Thudbuster LT 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). Start
with the softest elastomer recommended for a given rider weight. The Thudbuster LT is shipped
with 2 each of grey, blue and black elastomers. You may desire to increase the stiffness by us
-
ing harder elastomers. Never use softer elastomers than those recommended for your weight.
CHANGING ELASTOMERS
1. Using an 8 mm socket wrench and a 4 mm hex wrench, loosen the
locknut completely.
2. Push the saddle forward slightly to remove upper white, nylon washer
and steel washer.
3. Remove the skewer bolt, keeping the lower nylon washer and steel
washer on the skewer.
4. Push the saddle further forward to remove the elastomers and coupling
washer.
5. Select elastomers as required. When mixing different spring rate elasto-
mers, the order does not matter.
6. Grease the skewer bolt shaft and the top and bottom of each elastomer.
7. Place the coupling washer between the elastomers and place them into
the assembly.
8. Insert the skewer bolt through the lowest elastomer and the coupling
washer.
9. Push the saddle rearward while pushing the skewer through the top
elastomer and hole.
10. Re-install the nylon washer, steel washer and the locknut. DO NOT
TIGHTEN.
11. Install the locknut so that one full thread is exposed beyond the locknut
page 2).
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2
3
6
7
8
6
5
4
Grease
this
surface
Rider Weight Minimum Elasto-
mer Recommenda-
tion
(Pounds) (kg)
Under 100 Under 45 white* / white*
100-120 45-54 white* / grey
120-140 54-64 grey / grey
140-165 64-75 grey / blue
165-190 75-86 blue / blue
190-215 89-98 blue / black
215-250 98-113 black / black
Over 250 Over 113 Exceeds post limit
*white (extra soft) and purple (extra hard) elastomers are available separately
from www.canecreek.com
Cane Creek Cycling Components | 355 Cane Creek Rd., Fletcher, NC 28732 | 800.234.2725 | info@canecreek.com | canecreek.com
THUDBUSTER LT INSTRUCTIONS
Rev. 11/2013
INITIAL 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 six direct fit sizes between 25.4 and 31.6 mm.)
4. Grease the shim (if applicable) and seat pillar before installing. DO NOT lubricate seat tubes
of Carbon frames (unless specified by the manufacturer).
5. Insert the shim (if applicable) into the bicycle frame with the split aligned with the split in the
seat-tube.
6. Install the Thudbuster into the bicycle frame to approximately the correct height with the
extension marks on seat pillar facing the front of the bicycle.
7. Loosen the two saddle clamp bolts (front and rear) until the threads are barely engaging the
barrel nuts (1 or 2 threads). Be sure grease is applied to the interface between the lower
clamp and cradle.
8. Place one rail of saddle in position between the upper and lower clamps. Then rotate saddle
so the other rail slips over the far edge of the upper clamp and into position in the rail
grooves of the lower clamp.
9. Begin to tighten the front and rear clamp bolts. The saddle tilt adjustment is controlled by
these two bolts. Check that the saddle tilt and fore/aft position of the saddle are correct
before final tightening. The front bolt can be adjusted by hand or hex wrench, but the rear
bolt must be tightened to 60 in*lb (6.8 N*m) with a 4 mm hex wrench. Be sure all the com-
ponents of the clamp are installed as shown in section view. (Figure 1)
10. Adjust the saddle height if necessary
SELECTING ELASTOMERS
POSSIBLE COMBINATIONS
(Recommended in Bold)
Elastomer 1 Elastomer 2 lb. range kg. range
#1 (XSoft) #1 (XSoft) <100 <45
#1 (XSoft) #3 (Soft) 100-120 45-54
#1 (XSoft) #5 (Medium)
#1 (XSoft) #7 (Firm)
#3 (Soft) #3 (Soft) 120-140 54-64
#1 (XSoft) #9 (XFirm)
#3 (Soft) #5 (Medium) 140-165 64-75
#3 (Soft) #7 (Firm)
#5 (Medium) #5 (Medium) 165-190 75-86
#3 (Soft) #9 (XFirm)
#5 (Medium) #7 (Firm) 190-215 89-98
#7 (Firm) #7 (Firm) 215-240 98-109
#5 (Medium) #9 (XFirm)
240-250
(post limit)
109-113
(post limit)
#7 (Firm) #9 (XFirm)
#9 (XFirm) #9 (XFirm)
NOTICE! The Thudbuster must be set-up with appropriate
elastomer before riding (See below). Maximum allowable
rider weight is 250 lb (115kg).
The Thudbuster LT 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). Start with
the softest elastomer recommended for a given
rider weight. The Thudbuster LT is shipped with
2 medium and 1 each of soft and firm elastomers.
Extra soft and firm elastomers are available
separately from www.canecreek.com. You may
desire to increase the stiffness by using firmer
elastomers. Never use softer elastomers than those
recommended for your weight.
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