MTB Seat Posts
The seat post is the link between the frame and the saddle. When buying, pay close attention to two things: The correct diameter for your frame (often 27.2mm or 30.9mm) and the right mounting system for your saddle (Pivotal vs. Rails).
MTB Seat Posts FAQMTB Seat Posts Range
MTB Seat Posts FAQ
What is an MTB seat post?
In freestyle, seat posts are usually run very low ("slammed") to allow maximum freedom of movement. Therefore, they are often shorter than on touring bikes.
What systems are there?
- Pivotal Post
- Has a serrated head on top. Compatible only with Pivotal saddles. The most popular system as it is light and simple.
- Tripod Post
- Has a triangular mounting plate. Only for Tripod saddles.
- Rail Post
- Has a clamp head for two metal rails. For classic MTB saddles.
Which diameter do I need?
This is the most important point! The diameter must exactly match your frame's seat tube.
| Diameter | Typical Frame |
|---|---|
| 27.2mm | Mostly steel frames (e.g., NS Bikes Majesty, steel hardtails). |
| 30.9mm | Many alloy frames (e.g., Specialized, some Canyon). |
| 31.6mm | Many modern alloy frames (e.g., Rose The Bruce, Trek). |
How do I install the post?
- Lightly grease the lower part of the post (prevents seizing, especially aluminum in steel).
- Insert it into the frame.
- For Pivotal: Place saddle on top, screw long bolt through saddle into post, adjust angle, tighten.
- Tighten the seat clamp on the frame.
What do the specifications mean?
| Specification | Explanation | Examples/Available |
|---|---|---|
| Diameter | Outer diameter of the post. | 27.2mm, 30.9mm, 31.6mm |
| System | Saddle mount. | Pivotal, Tripod, Rails |
| Length | Total length. | 200mm - 350mm (often cuttable) |
