{"product_id":"2026-specialized-s-works-tarmac-sl8-carbon-post","title":"2026 Specialized S-Works Tarmac SL8 Carbon Post","description":"\u003cbody\u003e\n\u003cmeta charset=\"UTF-8\"\u003e\n\u003cmeta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\"\u003e\n\u003ctitle\u003eS-Works Tarmac SL8 Carbon Post\u003c\/title\u003e\n\u003cstyle\u003e\n@import url(https:\/\/fonts.googleapis.com\/css2?family=Barlow+Condensed:wght@400;600;700;800\u0026family=Barlow:wght@300;400;500\u0026display=swap);\n:root { --black: #0a0a0a; --white: #ffffff; --mid: #f5f5f5; --border: #e0e0e0; --text-muted: #777; --text-body: #222; }\n* { box-sizing: border-box; margin: 0; padding: 0; }\n.spur-wrap { font-family: 'Barlow', sans-serif; background: var(--white); color: var(--black); max-width: 1100px; margin: 0 auto; padding: 48px 24px; }\n.spur-header { display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 48px; border-bottom: 1px solid var(--border); padding-bottom: 24px; flex-wrap: wrap; gap: 12px; }\n.spur-title { font-family: 'Barlow Condensed', sans-serif; font-size: clamp(28px, 5vw, 48px); font-weight: 800; letter-spacing: -0.02em; line-height: 1; text-transform: uppercase; }\n.spur-meta { font-size: 12px; font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-muted); }\n.spur-tabs { display: flex; gap: 4px; margin-bottom: 32px; flex-wrap: wrap; }\n.spur-tab { font-family: 'Barlow Condensed', sans-serif; font-size: 14px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; padding: 10px 24px; background: var(--mid); color: var(--text-muted); border: 1px solid var(--border); cursor: pointer; transition: all 0.15s; border-radius: 2px; display: inline-block; }\n.spur-tab:hover { color: var(--black); border-color: #aaa; }\n.spur-tab.active { background: var(--black); color: var(--white); border-color: var(--black); }\n.spur-panel { display: none; }\n.spur-panel.active { display: block; }\n.spur-panel p { font-size: 14px; font-weight: 300; line-height: 1.7; color: var(--text-body); margin-bottom: 16px; }\n.desc-intro { font-size: 16px; font-weight: 400; line-height: 1.65; color: var(--text-body); margin-bottom: 28px; padding-bottom: 24px; border-bottom: 1px solid var(--border); }\nul.desc-list { list-style: none; padding: 0; margin: 0 0 20px 0; display: grid; grid-template-columns: 1fr 1fr; gap: 6px 24px; }\nul.desc-list li { font-size: 13px; font-weight: 400; line-height: 1.5; color: var(--text-body); }\n.key-section { border-bottom: 1px solid var(--border); padding: 16px 0; }\n.key-section:last-child { border-bottom: none; }\n.key-title { font-family: 'Barlow Condensed', sans-serif; font-size: 13px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--black); margin-bottom: 6px; }\n.key-desc { font-size: 14px; font-weight: 300; color: var(--text-body); line-height: 1.5; }\n.spec-category { font-family: 'Barlow Condensed', sans-serif; font-size: 11px; font-weight: 700; letter-spacing: 0.2em; text-transform: uppercase; color: var(--black); padding: 20px 0 8px; border-bottom: 2px solid var(--black); margin-bottom: 0; }\n.spec-row { display: grid; grid-template-columns: 200px 1fr; border-bottom: 1px solid var(--border); }\n.spec-row:hover { background: var(--mid); }\n.spec-key { font-size: 12px; font-weight: 500; letter-spacing: 0.05em; text-transform: uppercase; color: var(--text-muted); padding: 12px 16px 12px 0; }\n.spec-val { font-size: 14px; font-weight: 300; color: var(--text-body); padding: 12px 0; line-height: 1.5; }\n.warning-block { background: #fff3cd; border: 1px solid #ffc107; padding: 14px 16px; margin-top: 16px; font-size: 13px; font-weight: 500; color: #856404; line-height: 1.5; border-radius: 2px; }\n.setback-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--border); border: 1px solid var(--border); margin-top: 20px; }\n.setback-col { background: var(--mid); padding: 14px 16px; }\n.setback-col .type { font-family: 'Barlow Condensed', sans-serif; font-size: 14px; font-weight: 700; text-transform: uppercase; color: var(--black); margin-bottom: 6px; }\n.setback-col .clamp { font-size: 13px; font-weight: 500; color: var(--text-body); margin-bottom: 4px; }\n.setback-col .note { font-size: 12px; color: var(--text-muted); }\n@media (max-width: 600px) { .spec-row { grid-template-columns: 1fr; } .spec-key { padding-bottom: 2px; } .spec-val { padding-top: 0; padding-bottom: 12px; } ul.desc-list { grid-template-columns: 1fr; } .setback-grid { grid-template-columns: 1fr; } }\n\u003c\/style\u003e\n\n\n\u003cdiv class=\"spur-wrap\"\u003e\n\u003cdiv class=\"spur-header\"\u003e\n\u003cdiv class=\"spur-title\"\u003eS-Works Tarmac SL8 Carbon Post\u003c\/div\u003e\n\u003cdiv class=\"spur-meta\"\u003eReplacement Seatpost · Tarmac SL8 · FACT Carbon · Aero Profile · 0\/15mm Setback\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"spur-tabs\"\u003e\n\u003cbutton class=\"spur-tab active\" onclick=\"showPanel('desc', this)\"\u003eDescription\u003c\/button\u003e\n\u003cbutton class=\"spur-tab\" onclick=\"showPanel('key', this)\"\u003eKey Features\u003c\/button\u003e\n\u003cbutton class=\"spur-tab\" onclick=\"showPanel('specs', this)\"\u003eSpecifications\u003c\/button\u003e\n\u003c\/div\u003e\n\n\u003cdiv id=\"panel-desc\" class=\"spur-panel active\"\u003e\n\u003cp class=\"desc-intro\"\u003eThis 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.\u003c\/p\u003e\n\n\u003cul class=\"desc-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eFACT Carbon Construction:\u003c\/strong\u003e Full carbon body — lightweight, aerodynamic, SL8 specific.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAero Profile:\u003c\/strong\u003e Aerodynamically shaped — reduces drag at the seat tube junction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo Setback Options:\u003c\/strong\u003e 0mm or 15mm — two different clamp systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSL8 Specific:\u003c\/strong\u003e Designed for the 2024 Tarmac SL8 — direct replacement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e15mm: 2-Bolt Micro-Adjust:\u003c\/strong\u003e 46mm saddle rail cradle for precise positioning.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0mm: Cylindrical Aluminum Head:\u003c\/strong\u003e Fore-aft and tilt with single easy-access bolt.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThis 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.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv id=\"panel-key\" class=\"spur-panel\"\u003e\n\u003cdiv class=\"key-section\"\u003e\n\u003cdiv class=\"key-title\"\u003eSL8 vs. SL7 Post — Key Differences\u003c\/div\u003e\n\u003cdiv class=\"key-desc\"\u003eThe 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.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"key-section\"\u003e\n\u003cdiv class=\"key-title\"\u003e0mm Setback — Cylindrical Aluminum Head\u003c\/div\u003e\n\u003cdiv class=\"key-desc\"\u003eThe 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.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"key-section\"\u003e\n\u003cdiv class=\"key-title\"\u003e15mm Setback — 2-Bolt Micro-Adjust\u003c\/div\u003e\n\u003cdiv class=\"key-desc\"\u003eThe 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.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv id=\"panel-specs\" class=\"spur-panel\"\u003e\n\n\u003cdiv class=\"spec-category\"\u003eGeneral\u003c\/div\u003e\n\u003cdiv class=\"spec-row\"\u003e\n\u003cdiv class=\"spec-key\"\u003eModel\u003c\/div\u003e\n\u003cdiv class=\"spec-val\"\u003eS-Works Tarmac SL8 Carbon Post\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spec-row\"\u003e\n\u003cdiv class=\"spec-key\"\u003eUse\u003c\/div\u003e\n\u003cdiv class=\"spec-val\"\u003eReplacement post for 2024 Tarmac SL8\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spec-row\"\u003e\n\u003cdiv class=\"spec-key\"\u003eMaterial\u003c\/div\u003e\n\u003cdiv class=\"spec-val\"\u003eFACT carbon — full carbon body\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spec-row\"\u003e\n\u003cdiv class=\"spec-key\"\u003eProfile\u003c\/div\u003e\n\u003cdiv class=\"spec-val\"\u003eAerodynamic — reduces drag at seat tube junction\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"spec-category\"\u003eSetback Options\u003c\/div\u003e\n\u003cdiv class=\"spec-row\"\u003e\n\u003cdiv class=\"spec-key\"\u003eAvailable Setbacks\u003c\/div\u003e\n\u003cdiv class=\"spec-val\"\u003e0mm \/ 15mm\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"spec-category\"\u003e0mm Setback\u003c\/div\u003e\n\u003cdiv class=\"spec-row\"\u003e\n\u003cdiv class=\"spec-key\"\u003eHead Type\u003c\/div\u003e\n\u003cdiv class=\"spec-val\"\u003eCylindrical aluminum head assembly\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spec-row\"\u003e\n\u003cdiv class=\"spec-key\"\u003eAdjustment\u003c\/div\u003e\n\u003cdiv class=\"spec-val\"\u003eFore-aft and tilt with single easy-access bolt\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"spec-category\"\u003e15mm Setback\u003c\/div\u003e\n\u003cdiv class=\"spec-row\"\u003e\n\u003cdiv class=\"spec-key\"\u003eHead Type\u003c\/div\u003e\n\u003cdiv class=\"spec-val\"\u003e2-bolt micro-adjust clamp\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"spec-row\"\u003e\n\u003cdiv class=\"spec-key\"\u003eRail Cradle\u003c\/div\u003e\n\u003cdiv class=\"spec-val\"\u003e46mm — compatible with carbon and alloy saddle rails\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"warning-block\"\u003e⚠️ \u003cstrong\u003eTarmac SL8 Only:\u003c\/strong\u003e 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).\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003cscript\u003e\nfunction showPanel(id, btn) {\n document.querySelectorAll('.spur-panel').forEach(p =\u003e p.classList.remove('active'));\n document.querySelectorAll('.spur-tab').forEach(t =\u003e t.classList.remove('active'));\n document.getElementById('panel-' + id).classList.add('active');\n btn.classList.add('active');\n}\n\u003c\/script\u003e\n\n\n\n\u003c\/body\u003e","brand":"Specialized","offers":[{"title":"Satin Carbon \/ 300mm x 0mm Offset","offer_id":52012745720128,"sku":"28123-4100","price":350.0,"currency_code":"USD","in_stock":true},{"title":"Satin Carbon \/ 380mm x 15mm Offset","offer_id":52012745752896,"sku":"28123-4115","price":350.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0446\/7487\/5549\/files\/28123-4100_e3b93a79-b27c-4e8d-ac44-8ba49bd75b4a.jpg?v=1778797655","url":"https:\/\/spokex.com\/products\/2026-specialized-s-works-tarmac-sl8-carbon-post","provider":"SX Collective","version":"1.0","type":"link"}