There are several variations of head tubes available in BMX frames today. The head tube is the portion of a frame that the fork’s steerer tube passes through. Frames are made with seat tube angles ranging from 69-71.5 degrees, with 69 degrees being the shallower option. A shallower angle means the seat tube sits further back and the top tube’s length increases. This angle affects the position of your seat and the length of the frame’s top tube. Seat Tube Angle – This is the angle that the frame’s seat tube sweeps back, away from the back end of the bike. Bikes with steep head angles also have shorter wheelbases.Ī “shallower” head tube angle (lower numbers those in the 74-74.5 degree range) make the frame feel more stable at speed and in turns, which is why trails and dirt jumping frames generally have a shallower head tube angles. This makes tech tricks and nose manuals easier. See the diagram below to get a grasp of how it is measured.Ī “steeper” head tube angle (higher numbers those in the 75-75.5 degree range) generally positions a rider over the front end of their bike, while also sweeping the bottom of the fork inward towards the frame. Head Tube Angle – The angle of a frame’s head tube affects how the bike responds in terms of both steering and the rider’s position over the bike. The diagram below outlines the main geometries and frame components. It is important to understand the different geometries and styles of a frame before making a purchase.

Cody fee agent bmx