PRO Tharsis XC Seatpost
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PRO Tharsis XC Seatpost
PRO Tharsis XC Seatpost Info
The PRO Tharsis XC Seatpost is PRO's lightest mountain bike post, built from a unidirectional carbon fiber shaft with a matte finish that keeps the construction honest and the weight low. At 199g for the 27.2mm version, it's engineered specifically for cross-country riding — where every gram climbed is a gram earned. The angled cut at the base of the shaft isn't just visual; it removes material precisely where it isn't needed.
The single-bolt round clamp is straightforward to set and holds saddle angle reliably once dialed in. The clamp head accommodates both 7x7mm and 7x9mm rail profiles — two clamps are included in the box. For riders running electronic drivetrains, the post is Di2 battery compatible, with the hollow shaft designed to house a battery using the mounting hardware supplied with the battery unit. Available in 400mm length across three diameters: 27.2, 30.9, and 31.6mm. Setback options of 0mm and 20mm let you fine-tune your position on the bike.
PRO Tharsis XC Seatpost Specs at a Glance
- Material: Unidirectional carbon fiber shaft, matte finish
- Weight: 199g (27.2mm version)
- Length: 400mm
- Diameters: 27.2mm, 30.9mm, 31.6mm
- Setback: 0mm or 20mm — includes clamps for 7x7mm and 7x9mm rails
