S-PARTS is an online retailer focused on bicycle and motorcycle upgrade components, with a particular emphasis on titanium hardware and lightweight parts. Its catalog includes titanium bolts, screws, nuts, washers, and model-specific kits for frames, brakes, drivetrains, cockpits, pedals, saddles, and other bicycle components. Products are offered for popular systems and brands including Shimano, SRAM, Magura, Hope, Specialized, Colnago, and others, with selected kits available in multiple colors.

Beyond fasteners, S-PARTS sells derailleur hangers, brake adapters, headset spacers, integrated handlebars, computer mounts, chainrings, power meters, and accessories such as stickers and protective items. The range also includes carbon-fiber and aluminum components, motorcycle-related products, and 3D-printed titanium parts, including customized top caps and bicycle fittings. The store highlights compatibility with different bike models and integrated handlebars, alongside products designed for specific frames and component groups. Customers can browse by product type, bicycle brand, or component system, and the site promotes quantity discounts and free shipping on orders over $300.