The ZS44/ZS56 tapered configuration is the dominant headset standard on modern performance road, gravel, and cyclocross frames. Our ceramic set replaces both the upper ZS44 (44mm OD, 28.6mm fork) and lower ZS56 (56mm OD, 30mm fork) bearings with Grade 3 silicon nitride ceramic hybrids. DLC-coated races and ABEC-7 tolerances deliver smoother steering, reduced friction from the first ride.
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
- ✓ Includes both upper (ZS44) and lower (ZS56) bearings
- ✓ Integrated contact seals protect against road grime
Technical Specifications
| Includes |
2 bearings (upper + lower) |
| Seal Type |
Integrated contact seals |
| Tolerance |
ABEC-7 |
| Expected Life |
20,000–35,000 miles |
| Lower Bearing |
ZS56/30 (56mm OD) |
| Race Material |
52100 Chromium Steel, DLC Coated |
| Upper Bearing |
ZS44/28.6 (44mm OD) |
| Bearing Material |
Grade 3 Silicon Nitride (Si₃N₄) |
Compatibility
Trek Domane, Madone (tapered)
Specialized Tarmac SL7, SL8
Giant TCR Advanced
Cervelo R5, S5
Most modern road/gravel frames with tapered fork steerers
Any frame with ZS44 upper + ZS56 lower headtube