2026 Specialized S-Works Tarmac SL8 Carbon Post
Specialized

2026 Specialized S-Works Tarmac SL8 Carbon Post

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S-Works Tarmac SL8 Carbon Post
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).

Shipping Policy

Components:

All component items (wheels, drivetrains, suspension, brakes, etc.) ship within 1–4 business days of purchase.

Bicycles:

Complete bikes typically ship within 2–3 weeks due to build, tuning, and inspection times. You will receive tracking information as soon as your order is ready to ship.

Riding Gear & Apparel:

Riding gear and apparel orders (helmets, jerseys, gloves, etc.) ship within 1–3 business days.

Returns & Exchanges:

If you received the wrong size or wish to exchange an item, it must be returned in original condition—unused, uninstalled, and with all packaging intact.

For full details, please see our Refund Policy before initiating a return.

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S-Works Tarmac SL8 Carbon Post
Technology
💨
Aerodynamic Profile
FACT carbon construction with aerodynamic profile optimized for the Tarmac SL8.
🔧
Dual Setback Options
Two setback options — 0mm and 15mm — ensure the perfect fit for your riding position.
⚙️
Micro-Adjust Clamp
15mm offset model features 2-bolt micro-adjust clamp with 46mm saddle rail cradle for precise saddle positioning.
🔩
Easy Single-Bolt Adjust
0mm offset model uses cylindrical aluminum head with easy-access single bolt for quick fore-aft and tilt adjustment.
🎯
Tarmac SL8 Compatible
Designed specifically for the 2024 Tarmac SL8 — drop-in replacement for a perfect fit.
💪
FACT Carbon Construction
Premium FACT carbon delivers the strength and durability you expect from S-Works.
Built For
Road Racing
Grand Tours
Performance
All-Day Comfort
Quick Specs
FACT
Carbon
Premium Construction
0/15mm
Setback
Dual Options
46mm
Saddle Rail Cradle
Micro-Adjust Clamp
SL8
Compatibility
2024 Tarmac

Prepared with intention.

Every product is carefully inspected and handled by our team before it ships. From fit and function to final details, we make sure each piece is ready for the outdoors ahead—so you can focus on the experience, not the gear.

Passion drives us

At SpokeX Bike Co., bikes aren't just our business — they’re our way of life. As a rider-owned and operated shop, every decision we make comes from firsthand experience on the trail, at the race, and on the open road. We know what it’s like to chase a new line, push through the pain cave, and celebrate the ride — because we live it every day.

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