Sirrus

Sirrus is a proper name used in several contexts, most prominently as the name of a line of hybrid and fitness bicycles marketed by Trek Bicycle Corporation since the mid-2000s. The term has also appeared as a personal name in various works of fiction and as a surname in some cultures.

Trek Sirrus bicycles are designed for urban commuting and versatile fitness riding. They typically feature lightweight aluminum frames, flat handlebar configurations, and road-derived components optimized for reliability and everyday use. Over multiple generations, the Sirrus line has expanded to include models with carbon components, disc brakes, and wider tires in variants such as Sirrus X, which aim to broaden capability toward light gravel or mixed-surface riding. The lineup emphasizes a balance of efficiency, comfort, and practicality for daily riding and recreational cycling.

Beyond bicycles, Sirrus may be encountered as a given name or surname in fiction or real-world contexts. The usage is diverse and varies by author, region, and culture, with no single canonical reference beyond the bicycle line in popular catalogs and inventories. The term is distinct from Sirius, a star name and a common homograph used in branding and fiction.