The Buell XB series (2003–2010) redefined American sportbikes through extreme mass centralization, featuring fuel-in-frame design and perimeter braking for exceptional handling. Available in Firebolt (sport) and Lightning (street) variants, these machines paired Harley-Davidson V-Twin engines with rigid, compact chassis. For a comprehensive overview of XB models, visit Autoevolution . AI responses may include mistakes. Learn more