The PRO Tharsis 3Five Dropper Post is a lightweight 100-millimetre, infinite-travel, dropper seatpost.

Designed to provide you with a better sports’ bicycle experience the PRO Tharsis 3Five Dropper Post is a dropper post for weight conscious cross-country or endurance mountain bikers. It features 100-millimetres of infinite-travel, internal cable routing and is available in three diameters; 27.2-, 30.9- and 31.6-millimetres. The 27.2-millimetre version boasts a 3D forged construction with an AL6061 alloy lower and an AL7050 alloy shaft, with titanium bolts; which ensures that it tips the scales at just 405-grams. The 30.9- and 31.6-millimetre versions likewise boast a 3D forged construction; but with AL7075 lowers and an AL7050 shaft. The Tharsis 3Five Dropper has a new 2-bolt saddle clamp.


Lightweight cross-country and endurance mountain biking dropper seatpost
Featuring 100mm of infinite-travel
3D forged alloy construction
Titanium bolts
New collar
Lighter cartridge
Oval shaft inside shape
Internal cable routing


  100mm/27.2mm 100mm/30.9mm 100mm/31.6mm
Cable Routing Internal Internal Internal
Colour Black Black Black
Diameter 27.2 30.9 31.6
Material Alloy Alloy Alloy
Series Tharsis Tharsis Tharsis
Travel 100 100 100
Weight 417g 449g 471g

Be The First To Review This Product!

Help other Bikebug Pty Ltd users shop smarter by writing reviews for products you have purchased.

Write a product review