What headset does a Specialized Tarmac SL8 (2024 on) use?
The headset fitment standard on a Specialized Tarmac SL8 (2024 on), and how to pick the right part.
This frame's fitment
| Frame | Specialized Tarmac SL8 (2024 on) |
|---|---|
| Headset standard | IS42 (integrated, 42 mm) |
| Cup / bearing outside diameter | 41.8 to 42.0 mm bearing outside diameter |
| Steerer diameter | 28.6 mm (1 1/8 in) |
The Specialized Tarmac SL8 uses an integrated IS42 upper headset for the 28.6 mm steerer, a 27.2 mm class seatpost, a 12x100 front thru-axle and a braze-on front derailleur.
Specialized fits its own aero-shaped post, so the 27.2 mm figure describes the class, not a round Specialized post. The SL8 bottom bracket is a BSA threaded shell, covered on its own page.
The part to buy
Search Amazon for IS42 for your Specialized Tarmac SL8 (2024 on)affiliate searchFind IS42 for your Specialized Tarmac SL8 (2024 on) on eBayaffiliate
Related fitment pages
IS42integrated, 42 mmBottom bracket for Specialized Tarmac SL8 (2024 on)same frame, BB shellSeatpost diameter on a Specialized Tarmac SL8 (2024 on)same frameIS42 on a Trek Emonda SLR (2024 on)same standard, another frame
SOURCES: Park Tool, Standardized Headset Identification System (SHIS) · BikeGremlin, Bicycle headset bearing standards (SHIS) · BikeRadar, Road bike axle standards: the complete guide