BBB Integrated headset tapered 1 1/8 "to 1.5".

The headset fits in a frame where the bearings are placed in bowls at the top and bottom of the head tube.

The headsets have a diameter of 41.8 mm at the top and 51.8 mm at the bottom.

They have the following angles top 45x45 degrees, bottom 36x45 degrees.