Here is my completely overthetop resource outlining the best suspension seatposts.

The Bikepacking Bike Buyer's Guide: https://www.cyclingabout.com/bikepack...
The Touring Bicycle Buyer's Guide: https://www.cyclingabout.com/touring...

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BEST Spring Suspension Seatposts (affiliate links send me a small commission for my work):
Kinekt Spring Post 25.4, 27.2, 30.9, 31.6mm https://amzn.to/3xIRJWj
Kinekt Carbon Lightweight Post 27.2mm https://amzn.to/3eb5PrH
Redshift Shockstop 27.2mm (shims available) https://amzn.to/3tkl5qp
By.schulz G.2 https://amzn.to/3tthIgX
Cheap SR Suntour NCX 27.2mm https://amzn.to/33rkcC1
Cheap SR Suntour NCX 30.9mm https://amzn.to/3uvWi45
Cheap SR Suntour NCX 31.6mm https://amzn.to/3b8RTwj

BEST Elastomer Suspension Seatposts (affiliate links send me a small commission for my work):
Cane Creek 50mm Thudbuster 27.2mm https://amzn.to/3nXvMOE
Cane Creek 50mm Thudbuster 30.9mm https://amzn.to/3nZY6A6
Cane Creek 50mm Thudbuster 31.6mm https://amzn.to/2Q6kHi0
Cane Creek 90mm Travel 27.2mm https://amzn.to/3xToDDI
Cane Creek 90mm Travel 30.9mm https://amzn.to/3xQD3Vf
Cane Creek 90mm Travel 31.6mm https://amzn.to/3exa7Km
Cane Creek 20mm eeSilk (what I currently use)

BEST Dropper Suspension Seatpost (affiliate links send me a small commission for my work):
PNW Coast 30.9, 31.6mm https://amzn.to/3vF0uPe

Microbac seatpost lab test: https://www.bikeradar.com/features/fi...
University of Exeter cycling vibration study: https://www.tandfonline.com/doi/full/...
GravelBikes' field vibration tests: https://gravelbikes.cc/category/tests

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0:00 Intro
0:49 6 Reasons To Use Suspension Seatposts
2:30 4 Reasons To NOT Use Suspension Seatposts
3:14 Damping & Deflection
3:57 Dangers of High Vibration Exposure
4:53 The Three Different Seatpost Damping Systems
6:29 The Two Different Seatpost Designs
7:17 Seatpost Field Testing Data
8:21 How To Choose The Suspension Travel
9:07 Best Spring Seatposts
11:09 Best Elastomer Seatposts
11:51 Best Dropper Suspension Seatposts
12:38 Summary