page_title: Bicycle frame
section_title: Frame size
hierarchical_section_title: Bicycle frame / Frame geometry / Frame size
context_page_description: A bicycle frame is the main component of a bicycle, onto which wheels and other components are fitted. The modern and most common frame design for an upright bicycle is based on the safety bicycle, and consists of two triangles: a main triangle and a paired rear triangle. This is known as the diamond frame. Frames are required to be strong, stiff and light, which they do by combining different materials and shapes.
  A frameset consists of the frame and fork of a bicycle and sometimes includes the headset and seat post. Frame builders will often produce the frame and fork together as a paired set.
context_section_description: Frame size was traditionally measured along the seat tube from the center of the bottom bracket to the center of the top tube. Typical "medium" sizes are 54 or 56 cm (approximately 21.2 or 22 inches) for a European men's racing bicycle or 46 cm (about 18.5 inches) for a men's mountain bike. The wider range of frame geometries that now exist has also led to other methods of measuring frame size. Touring frames tend to be longer, while racing frames are more compact.
caption: Commonly used measurements