Sometimes you only need the upper bearing. Our ZS44/28.6 individual ceramic bearing is a direct drop-in replacement for the upper position in any Zero Stack 44mm headset with a 1-1/8" fork steerer. Grade 3 silicon nitride balls, DLC-coated race, ABEC-7 tolerances. Sold individually.
What You Get
- ✓ Grade 3 Si₃N₄ ceramic balls — reduced steering friction from ride one
- ✓ DLC-coated chromium steel races for extended bearing life
- ✓ ABEC-7 precision tolerances for smooth, play-free steering
- ✓ Sold individually — ideal for single bearing replacement
- ✓ Upper bearing for ZS44/28.6 headsets
Technical Specifications
| Includes |
1 bearing (upper position) |
| Seal Type |
Integrated contact seals |
| Tolerance |
ABEC-7 |
| Fork Steerer |
28.6mm (1-1/8 inch) |
| Expected Life |
20,000–35,000 miles |
| Race Material |
52100 Chromium Steel, DLC Coated |
| Bearing Material |
Grade 3 Silicon Nitride (Si₃N₄) |
| Bearing Standard |
ZS44/28.6 |
| Headtube Diameter |
44mm |
Compatibility
Upper position: frames with ZS44 upper cup
1-1/8 inch fork steerer
Any ZS44 headset system — road, gravel, cyclocross
Paired with ZS56 lower for tapered setups