Incredibell triple: The Incredibell Triple fits the three most common handlebar sizes: 22.2mm, 25.4mm and 31.8mm. 7.50€
Adjustabell: Mirrycle’s Adjustabell uses a fully adjustable handlebar clamp that fits any size bars. Plus, its perfect size and pivoting ringer let you mount it just about anywhere on your handlebars. A flick of your finger and it rings loud and clear for all to hear. 7.50€
Bar End Bell: Fits handlebars with 15.75mm – 25mm (.62″ – .98″) inside diameters. This bell fits into the end of almost any handlebar: flat bars, mountain bike bars, drop bars. It will also fit into many bar ends. It could even fit into the end of a ski pole or walking stick. It comes in solid brass and chrome-plated solid brass. To operate it, all you need to do is place the edge of your palm on the bell and move a little forward or backward. It has a nice, resonant double ring. The Bar End Incredibell weighs 1.8 ounces. 13€