The 61903 thin-series bearing (17x30x7mm) is found in lightweight road hubs and some headset systems where reduced bearing height is critical. Grade 3 silicon nitride balls with DLC-coated races and ABEC-7 tolerances deliver the performance upgrade without adding width. 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
- ✓ Thin-section design for space-constrained applications
- ✓ Sold individually — order the quantity you need
Technical Specifications
| Series |
61900 thin-section |
| Sold As |
Individual bearing |
| Seal Type |
2RS contact seals |
| Tolerance |
ABEC-7 |
| Dimensions |
17x30x7mm |
| Expected Life |
10,000–20,000 miles |
| Race Material |
52100 Chromium Steel, DLC Coated |
| Bearing Material |
Grade 3 Silicon Nitride (Si₃N₄) |
Compatibility
Lightweight road hubs requiring thin-section bearings
Some integrated headset designs
High-end front hub non-drive bearings
Any application requiring a thin-section 17x30x7mm bearing