The 6904 (20x37x9mm) is used in rear hubs, pedal spindles, and bottom bracket designs. Its larger diameter makes it well-suited for high-load applications. Grade 3 silicon nitride balls, DLC-coated races, ABEC-7 tolerances. Sold individually.
What You Get
- ✓ Grade 3 Si₃N₄ ceramic balls — harder and smoother than steel
- ✓ DLC-coated races reduce surface friction and extend life
- ✓ ABEC-7 precision tolerances for exact bearing bore fit
- ✓ 2RS contact seals for broad application use
- ✓ Sold individually — order the quantity you need
Technical Specifications
| Sold As |
Individual bearing |
| Seal Type |
2RS contact seals |
| Tolerance |
ABEC-7 |
| Dimensions |
20x37x9mm |
| Expected Life |
8,000–15,000 miles |
| Race Material |
52100 Chromium Steel, DLC Coated |
| Bearing Material |
Grade 3 Silicon Nitride (Si₃N₄) |
Compatibility
Road rear hub drive-side (selected models)
Pedal spindle bearings
Some bottom bracket applications
Any application requiring a 20x37x9mm bearing