Bearings
Caged Bike ball bearing Description :
Replace parts (crankshaft bearing, headsets, hubs).
The diameter are measured inside and outside (its an approximate value in mm).
Item: 40 mm, 20 balls (rear hub)
Outside diameter : 40 mm
Number of balls : 20
All about Headset Bearings:
1. How many different types of bearings are used in the modern day headset?
Answer: There are at least 6 different kinds of bearings used in the bicycle headset. They include; radial bearings, thrust bearings and angular contact bearings. These three types of bearings all use ball bearings. The second category of bearings is the roller bearings which include the standard roller bearing and the tapered roller bearing. Both of these use cylindrical rollers.