Tern HSD - Suspension Seatpost; Selecting Elastomers

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8. Suspension Seatpost
This section is for models equipped with the Thudbuster ST Suspension Seatpost.
The Thudbuster uses elastomers as a suspension element within a parallelogram
housing where the distance from the seat to pedal never changes.
Selecting Elastomers
The elastomer is made from natural rubber for its favorable damping characteristics and completely silent operation. To identify the
stiffness of elastomer, locate the number on the small dial that is molded into one side. 1 is extra-soft, 9 is extra firm and 5 is medium.
Cane Creek offers various elastomers for replacement. The Thudbuster must be set-up with appropriate elastomer before riding.
Rider Weight Minimum Elastomer Recommendation
(Kilograms) (Pounds)
Under 45 Under 100 Extra Soft - #1
45-64 100-140 Soft - #3
64-86 140-190 Medium - #5
86-114 190-250 Hard - #7
Over 114 Over 250 Exceeds post limit
Maximum allowable rider weight is 114 kg (250 lb). Never use a softer elastomer than recommended for your weight.
Periodically check elastomer for excessive wear and replace if necessary.
For details about changing elastomer, maintenance and precautions, refer to the Thudbuster instructions included with your HSD.