The classic bicycle computer with wire or wireless sensor - the most important data always in view.
In order to keep track of all relevant driving data, nobody needs to strap their smartphone to the handlebars. Basic bike computer models, however, can continue to convince due to their relatively simple design and the compact design designed for typical bicycle loads. In the high-end segment, the bike computers have robust chassis with easy-to-read display and GPS, NAVI or power meter with pulse function. Of course, a bike computer is more than that, through the modern technology, the bike computers are recognized as training tools already.