4x9x4 Bearing
Comparing Ball Bearings and Roller Bearings
The most common types of bearings you’ll find in a motorcycle are ball bearings and roller bearings.
Ball bearings use spherical balls in between the inner and outer rings to reduce friction. The contact points between the balls and the rings are very small which allows the bearing to spin freely at high RPMs.
Roller bearings use small cylindrical rollers instead of spherical balls to allow the inner and outer rings to spin freely. Using rollers helps spread the weight of heavier loads across a larger surface.
Axial vs. Radial Loads
It’s helpful to understand the two types of loads a bearing will be subjected to during its operation, namely axial loads and radial loads.
- AST F684H-2RS deep groove ball bearings
- 1.8750 in
- 1.2190 in
- ZEN F4-9 thrust ball bearings
- 3.2813 in
- 8865590091270
- 4 mm x 9 mm x 4 mm ISO 618/4 ZZ deep groove ball bearings
- 52100/Black Oxi
- Max 250°
- 4 mm x 9 mm x 4 mm KOYO WF684ZZ deep groove ball bearings
- 1.8750 in
- 1.2190 in
- 4 mm x 9 mm x 4 mm ISB SS 638/4-ZZ deep groove ball bearings
- Lubrication Fitting
- 13.6300 in
- 4,000 mm x 9,000 mm x 4,000 mm NTN F-W684AZZ deep groove ball bearings
- Lubrication Fitting
- 13.6300 in
- 4 mm x 9 mm x 4 mm SKF W638/4-2Z deep groove ball bearings
- 3.2813 in
- 8865590091270
- 4 mm x 9 mm x 4 mm ZEN SF684-2Z deep groove ball bearings
- 1.5100 in
- HM212010
- 4 mm x 9 mm x 4 mm SKF W638/4-2RS1 deep groove ball bearings
- 1.8750 in
- 1.2190 in
- 4,000 mm x 9,000 mm x 4,000 mm NTN W684ASSA deep groove ball bearings
- 1.8750 in
- 1.2190 in
- 4 mm x 9 mm x 4 mm SKF W 638/4 R-2Z deep groove ball bearings
- Lubrication Fitting
- 13.6300 in