Knight Head is a small company based in San Diego that designs and sells products for the DIY (do-it-yourself) lifestyle. With more than 1,000 products on their website, the company has a wide range of products for all ages and budgets. The Knight Head accessories include a wide variety of bike accessories, including reflectors, bicycle baskets, and bicycle locks. Knight Head Accessories. We love the style, quality, and value of their products! Knight Head is a small company based in San Diego that designs and sells products for the DIY (do-it-yourself) lifestyle. With more than 1,000 products on their website, the company has a wide range of products for all ages and budgets.