When you only need the lower bearing — for replacement, or for custom headset configurations — our ZS56/30 individual bearing delivers the full ceramic treatment. Grade 3 silicon nitride balls, DLC-coated race, ABEC-7 tolerances. Fits all frames using a ZS56 lower cup with a 30mm (1.5") lower fork steerer. 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
- ✓ Lower bearing for ZS56/30 headsets
Technical Specifications
| Includes |
1 bearing (lower position) |
| Seal Type |
Integrated contact seals |
| Tolerance |
ABEC-7 |
| Fork Steerer |
30mm (1.5 inch) |
| Expected Life |
20,000–35,000 miles |
| Race Material |
52100 Chromium Steel, DLC Coated |
| Bearing Material |
Grade 3 Silicon Nitride (Si₃N₄) |
| Bearing Standard |
ZS56/30 |
| Headtube Diameter |
56mm |
Compatibility
Lower position: frames with ZS56 lower cup
1.5 inch lower fork steerer
Tapered fork / straight steerer combinations
Trek, Specialized, Cannondale tapered headset designs