“Built-in” is a product feature, not a universal bearing standard. On the DSCO Built-In product page, the set is described as eight bearings with built-in spacers. The product page is the source to check for the current contents and price.
What a spacer does
A conventional spacer sits between the two bearings inside a wheel. It helps keep the bearing pair aligned when the axle nut is tightened. A built-in spacer arrangement can reduce the number of separate small parts you handle during installation. It does not remove the need to check fit, assemble the wheel correctly or confirm that it turns freely.
Before choosing a built-in set
Check that the product’s design is compatible with your wheels and hardware. Do not assume that every integrated system is interchangeable with every conventional spacer. If you already have a preferred setup or need to replace one part only, compare the product details carefully.
Read the DSCO Built-In listing and the spacers and speed rings guide. If you cannot confirm compatibility from the available details, ask DSCO before ordering.