What headset does a Specialized Stumpjumper (2019 on carbon) use?
The headset fitment standard on a Specialized Stumpjumper (2019 on carbon), and how to pick the right part.
This frame's fitment
| Frame | Specialized Stumpjumper (2019 on carbon) |
|---|---|
| Headset standard | ZS44 (zero stack, 44 mm) |
| Cup / bearing outside diameter | 44.0 mm cup outside diameter, 43.9 to 43.95 mm head-tube bore |
| Steerer diameter | 28.6 mm (1 1/8 in) |
The carbon Specialized Stumpjumper uses a ZS44 upper zero-stack headset, a 34.9 mm dropper seatpost, a 15x110 Boost front thru-axle and a braze-on front-derailleur mount if a front mech is fitted.
Most builds are 1x with no front derailleur; the mount note applies only to 2x conversions. The bottom bracket is a 73 mm BSA threaded shell, covered on its own page.
The part to buy
Search Amazon for ZS44 for your Specialized Stumpjumper (2019 on carbon)affiliate searchFind ZS44 for your Specialized Stumpjumper (2019 on carbon) on eBayaffiliate
Related fitment pages
ZS44zero stack, 44 mmBottom bracket for Specialized Stumpjumper (2019 on carbon)same frame, BB shellSeatpost diameter on a Specialized Stumpjumper (2019 on carbon)same frameZS44 on a Santa Cruz Hightowersame standard, another frame
SOURCES: White Industries, ZS44/EC44 headset · Park Tool, Standardized Headset Identification System (SHIS) · BikeRadar, Mountain bike axle standards: the complete guide