The Overclamp Butler allows perfect ROX bike computer alignment, even on short stems. The computer head can thus be positioned centrally above the stem at the level of the handlebars. This ensures space and order. The Butler fits handlebars of 31.8 and 35 mm diameters.Key Features 31.8 / 35 mm 3D Rubber Pads ROX 2.0 / ROX 4.0 / ROX 11.1 EVO