A sealed bearing is a variant of the standard deep groove ball bearing. The design of the raceway, cage, and ball assembly is the same; having said that, between the inner and outer rings are mechanised non-metallic seals. Sealed bearings cannot be relubricated.
Advantages:
1. Accessibility of contamination is significantly restricted.
2. Zero regular relubrication is required.
Disadvantages:
1. The bearing lifetime is restricted by the sum of lubrication loaded in between the seals of the bearing and the lube life.
2. The functionality of using sealed bearings is limited due to the excessive heating on larger sizes.
3. Maintenance needs replacement of the bearing.
Shielded bearings vs Sealed bearings
You may find three kinds of shielded bearings: 1) two shields (metal), 2) one metal shield & one pop-out cap for maintanence, 3) two pop-out caps. In case you possess types 2 or 3, you'll have no trouble re-lubing your bearings
You will find fundamentally two types of bearings: shielded bearings vs sealed bearings. Most likely you'll have shielded bearings, that all stock skates come with. Shields allow it to be hard for grime and dirt to go into, however they definitely are not dust or watertight. For superior protection resistant to the elements, you'll need sealed bearings.
Lots of people are always confused over the difference in between sealed bearings and shielded bearings. All skate board bearings have shields on at least one side. Some are double-shielded. Sealed bearings possess a shield made of metal and a coating over them. The seal safeguards the bearings from dirt, moisture and road salt. While shielded bearings possess the advantage of making no friction, there is a very small amount of open space in which dirt and moisture can enter. But the choice is yours.
View & Buy Sealed Bearings at Amazon.com Now
View & Buy Shielded Bearings at Amazon.com Now
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