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.
- 4 mm x 9 mm x 4 mm ISO 618/4-2RS deep groove ball bearings
- 1.5100 in
- HM212010
- 4 mm x 9 mm x 4 mm ISO F684ZZ deep groove ball bearings
- 52100/Black Oxi
- Max 250°
- 4 mm x 9 mm x 4 mm KOYO W684ZZ deep groove ball bearings
- 1.5100 in
- HM212010
- 4 mm x 9 mm x 4 mm KOYO WFN684 ZZ deep groove ball bearings
- 3.2813 in
- 8865590091270
- 4 mm x 9 mm x 4 mm NSK 684 AZZ deep groove ball bearings
- 3.2813 in
- 8865590091270
- 4,000 mm x 9,000 mm x 4,000 mm NTN F-FLW684ASSA deep groove ball bearings
- 1.5100 in
- HM212010
- 4 mm x 9 mm x 4 mm ZEN SF684-2RS deep groove ball bearings
- 52100/Black Oxi
- Max 250°
- 4 mm x 9 mm x 4 mm FBJ 684ZZ deep groove ball bearings
- 1.5100 in
- HM212010
- 4 mm x 9 mm x 4 mm PFI 684-2RS C3 deep groove ball bearings
- 52100/Black Oxi
- Max 250°
- 4 mm x 9 mm x 4 mm ZEN S684-2Z deep groove ball bearings
- Uncoated
- 146000 N