A BMX frame forms the basis for handling, fit, and durability. Depending on the intended use, the geometry, tube lengths, and angles vary – compact for technical street riding, balanced for park riding, or longer and more stable for trails. Most frames are made of 100% chromoly steel and are designed for high stress. Details such as integrated headsets, mid bottom brackets, and chain tensioners are now standard. The selection ranges from simple entry-level models to frames for professional use. Brands like Fiend, BSD, Cult, Wethepeople, and Stranger stand for well-thought-out designs and long-lasting quality.