A bike is a macro-product assembled out of many components. The mechanical interfaces are playing a decisive role. For individual height adjustment of the saddle the saddle tube is generally provided with a clamping slot. Product innovation: the saddle-clamp covers with the apron on its back side the clamping slot of the saddle tube which is susceptible to dirt. The asymmetrical snail-formed design enables the extreme little weight of 18 grams.