During the Black Friday, you can find discounted seat posts, from rigid aluminium or carbon posts to suspended and dropper posts for mountain bikes or gravel bikes. Before comparing two discounts, note the diameter stamped on your current post and, for a dropper post, the space available in the frame: these two dimensions filter the page better than any filter.
Three families share the page. The rigid post is used to lighten the bike or correct a setback; the suspension post, whether spring or parallelogram, softens rides on rough roads; and the telescopic post lowers the seat with a press of the handlebar. It’s often it that we aim for during the operation, as it transforms the handling of a mountain bike downhill and gains ground in gravel, provided it is sized correctly.
Most references carry their dimensions in the name: diameter and travel for the Reverb AXS from Rockshox or the SP-T20 from XLC, setback for FSA, where code SB25 means 25 mm of setback and SB0 means a straight post. The same post can also exist in two finishes, like the Transfer from Fox in Factory and Performance Elite. Finally, check if the handlebar control is included: some offers bundle the post and control, while others sell the post alone, affecting the perception of a crossed-out price. A promotion is thus only judged by identical diameter, travel, finish, and content as detailed in the product sheet.
The page for seat posts explains all year round the fitting, tightening, and maintenance. During the promotion, a new post often goes with a seat in Black Friday; clamps and small parts are found in the spare parts of the cockpit. The selections by practice gather road posts, MTB, and BMX. After the promotion, it’s time for clearance and new arrivals.
XLC ranges its telescopic posts under the SP-T codes, from the SP-T20, offered with 100 to 200 mm of travel, to the SP-T09 in 27.2 mm, and its suspension posts under the SP-S codes.
Rockshox commands its Reverb AXS wirelessly from the handlebar, offers it for gravel in XPLR with 50 or 75 mm of travel, and keeps the Reverb Stealth hydraulic with internal routing.
Fox Factory manufactures the Transfer in two finishes with identical functioning: Factory, with the shaft coated in the golden Kashima treatment, and Performance Elite, with an anodized black shaft.
Pro associates a post with each practice: Vibe and PLT on road, Discover in gravel, with a telescopic version, Koryak and Tharsis in MTB.
FSA indicates the setback in its references and plans Di2 versions that house the battery of the electronic transmission Shimano in the post; the ITC head of the SL-K adjusts the angle and setback separately.
Black Friday is linked to the day after Thanksgiving, which is a Friday, but Vélo-Store runs its seat post discounts throughout November. For a telescopic post, read the details of the offer: depending on the brands, the handlebar control is either included with the post or purchased separately, especially for cable or hydraulic models.
The longest that your seat height and the depth of the seat tube allow. In trail and enduro MTB, 150 to 200 mm is common; in gravel, 50 to 75 mm keeps a pedalling position close to that of the road.
A wireless post fits on almost any frame, without needing to run a housing, but its battery needs charging. A cable post requires suitable routing for the frame and adjustment of tension, but needs little maintenance aside from cable replacement.
Yes, if the diameter exists in telescopic, 27.2 mm for example, and if the frame allows enough insertion length. Without internal passage, choose an external routing version or a wireless one.
Some are designed for it, like the parallelogram posts from Suntour. The spring is chosen based on your weight, and the post must leave enough clearance above the frame to pivot.