Zero Headset Bearing 40x52x7mm 36/45 R426
Headset Bearing R426 40 x 52 x 7mm
What Is It?
The Zero Headset Bearing R426 is a replacement angular-contact cartridge bearing used in integrated and semi-integrated (zero-stack) bicycle headsets. It is designed to provide smooth steering performance by allowing the fork and frame to rotate freely while supporting rider and impact loads. The R426 designation refers to a bearing measuring 40mm inner diameter × 52mm outer diameter × 7mm width with 36°/45° bearing angles.
Key Features
- Sealed cartridge headset bearing design.
- 40mm inner diameter, 52mm outer diameter, 7mm thickness.
- 36° x 45° angular contact bearing configuration.
- Smooth steering and load distribution.
- Sealed construction helps resist water and dirt contamination.
- Suitable for many integrated and zero-stack headset systems.
- Direct replacement for worn or rough headset bearings.
Specifications
| Specification |
Details |
| Product Type |
Headset Cartridge Bearing |
| Bearing Code |
R426 |
| Inner Diameter (ID) |
40 mm |
| Outer Diameter (OD) |
52 mm |
| Width |
7 mm |
| Bearing Angle |
36° / 45° |
| Bearing Type |
Angular Contact Cartridge Bearing |
| Application |
Integrated / Zero-Stack Headsets |
| Sealing |
Sealed Bearing Design |
| Weight |
Approximately 33 g (varies slightly by manufacturer) |
The R426 specification corresponds to a 40×52×7 mm bearing with 36°/45° contact angles.
Pros
✅ Cost-effective solution for restoring smooth headset performance.
✅ Sealed design reduces maintenance requirements.
✅ Handles steering and impact loads efficiently.
✅ Easy replacement when matched to the correct headset specification.
✅ Widely used size across many modern MTB and road bike headsets.
Cons
❌ Must exactly match bearing dimensions and contact angles.
❌ Incorrect angle specification can cause poor fitment and headset play.
❌ Bearings eventually wear from water ingress, dirt, and heavy use.
❌ Requires headset disassembly for replacement.
Who Is It Suitable For?
- Mountain bike riders.
- Trail and enduro cyclists.
- Road cyclists with integrated headsets.
- Bicycle mechanics and workshops.
- Riders servicing worn or rough headset bearings.
Who Should Use It?
This bearing is ideal for cyclists whose existing headset bearing is marked R426, 40x52x7, or 36°/45°. It is intended for replacing a worn, gritty, loose, or corroded headset bearing while maintaining the original headset fit and steering performance. Before purchasing, confirm the dimensions and bearing angles on the existing bearing, as similar-sized bearings may use different contact angles.
Bottom Line
The Zero Headset Bearing 40x52x7mm 36/45 R426 is a common replacement headset bearing that offers smooth steering, durability, and reliable performance when matched to the correct headset system. Its sealed angular-contact design makes it an excellent maintenance item for restoring precise handling and eliminating headset roughness or play.
