????️ What it is
This is a semi-integrated (Zero Stack / ZS) headset designed for modern bikes with a tapered fork steerer tube:
- 1 1/8” (top)
- 1.5” (bottom)
It’s used to allow smooth steering while supporting the larger, stronger tapered fork standard common on modern MTBs and many road/gravel bikes.
???? Key specs explained
???? SHIS standard (ZS system)
Typically:
-
ZS44/28.6 (upper) → for 1 1/8” steerer
-
ZS55/40 or ZS56/40 (lower) → for 1.5” steerer crown race seat
???? This tells you exactly what frame/headtube it fits.
???? Tapered steerer compatibility
- ✔ 1 1/8” top
- ✔ 1.5” bottom
- Used on:
- Modern mountain bikes
- Gravel bikes
- Some endurance road bikes
???? Semi-integrated (Zero Stack) design
- Cups are pressed inside the head tube
- Bearings sit almost flush with the frame
- Benefits:
- Cleaner look
- Slightly lower stack height
- Better frame integration vs external cup headsets
⚙️ Bearings (two options)
Neco typically offers:
-
Ball retainer bearings
- Cheaper
- Easier to service
- More maintenance needed
-
Sealed cartridge bearings
- Smoother steering
- Better durability in wet/dusty conditions
- Less maintenance
???? Crown race (39.8 mm)
- Sits on the fork crown
- Matches tapered fork geometry
- Must match fork exactly for smooth steering
???? What’s usually included
Most kits contain:
- Upper and lower headset cups
- Bearings (type depends on version)
- Crown race
- Top cap + preload bolt
- Star nut (for threaded insertion in steerer)
???? Where it fits best
This headset is designed for:
- Modern MTB frames with tapered head tubes
- Gravel bikes
- Some road endurance bikes
- Frames using ZS44 top + ZS55/56 bottom standards
⚠️ Critical compatibility checks
Before buying, confirm:
- ✔ Your frame uses semi-integrated (ZS) headset cups
- ✔ Head tube IDs match 44 mm top + 55/56 mm bottom
- ✔ Fork is tapered 1 1/8” to 1.5”
- ✔ Crown race diameter matches your fork (usually 39.8 mm for tapered MTB forks)
???? Bottom line
The Neco tapered semi-integrated headset is a modern, widely used MTB headset system that balances clean integration with strong support for tapered forks. It’s reliable, serviceable, and available in both budget and upgraded sealed-bearing versions.
