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2026 Specialized S-Works Tarmac SL8 Carbon Post

Name: 2026 Specialized S-Works Tarmac SL8 Carbon Post
Brand: www.aetgo.com
SKU: 236288638
Price: 122.50 USD
Availability: InStock
Rating: 4.1 (102 reviews)

4.1 (102 items)

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Product details

Management number	236288638	Release Date	2026/07/09	List Price	US$122.50	Model Number	236288638
Category	Outdoor & Sports Bike Components & Accessories

S-Works Tarmac SL8 Carbon Post

Replacement Seatpost · Tarmac SL8 · FACT Carbon · Aero Profile · 0/15mm Setback

This replacement seatpost for the Tarmac SL8 ensures the perfect fit with two different setback options — 0mm and 15mm. Built from FACT carbon with an aerodynamic profile, it's designed specifically for the 2024 Tarmac SL8. The two setback options use different clamping systems — 0mm gets the cylindrical aluminum head, 15mm gets the 2-bolt micro-adjust clamp.

FACT Carbon Construction: Full carbon body — lightweight, aerodynamic, SL8 specific.
Aero Profile: Aerodynamically shaped — reduces drag at the seat tube junction.
Two Setback Options: 0mm or 15mm — two different clamp systems.
SL8 Specific: Designed for the 2024 Tarmac SL8 — direct replacement.
15mm: 2-Bolt Micro-Adjust: 46mm saddle rail cradle for precise positioning.
0mm: Cylindrical Aluminum Head: Fore-aft and tilt with single easy-access bolt.

This is a replacement post for an SL8 — not a universal seatpost. The 15mm setback (vs. SL7's 20mm) reflects the SL8's different geometry and rider position priorities.

SL8 vs. SL7 Post — Key Differences

The SL8 post has 15mm max setback vs. the SL7's 20mm max — a result of the SL8's different geometry and rider position. Both have 0mm option, but the SL8 has a different head design for the 15mm version (2-bolt micro-adjust vs. the SL7's design). The SL8 post also doesn't list Di2 integration, which was a key feature of the SL7 post — likely reflecting the SL8's different internal cable routing approach.

0mm Setback — Cylindrical Aluminum Head

The 0mm option uses a cylindrical aluminum head with a single bolt for fore-aft and tilt adjustment. This is a simple, lightweight design that's easy to adjust — just loosen the bolt, position the saddle, tighten to spec. The aluminum head is more rigid than a 2-bolt system, which can be beneficial for a 0mm setback position where stiffness matters.

15mm Setback — 2-Bolt Micro-Adjust

The 15mm setback option uses the 2-bolt micro-adjust clamp with 46mm saddle rail cradle. This is the same clamp design used on Roval's Alpinist and Control SL posts — proven, reliable, and compatible with both carbon and alloy saddle rails. The 46mm cradle distributes clamping force evenly, which is especially important for carbon rails.

General

Model

S-Works Tarmac SL8 Carbon Post

Use

Replacement post for 2024 Tarmac SL8

Material

FACT carbon — full carbon body

Profile

Aerodynamic — reduces drag at seat tube junction

Setback Options

Available Setbacks

0mm / 15mm

0mm Setback

Head Type

Cylindrical aluminum head assembly

Adjustment

Fore-aft and tilt with single easy-access bolt

15mm Setback

Head Type

2-bolt micro-adjust clamp

Rail Cradle

46mm — compatible with carbon and alloy saddle rails

⚠️ Tarmac SL8 Only: This seatpost is designed specifically for the 2024 Tarmac SL8. It is not a universal seatpost — confirm your frame is an SL8 before ordering. For the SL7 post, see the S-Works Tarmac Carbon Post (SL7).