A bike bell doesn’t have to look and sound ugly. The Oi bell from Knog adds an element of style and personality to your bike. Sounding "like an angel playing a glockenspiel", they have seriously upped the game in the bell department! The Small Oi fits 22.2mm bars e.g Mountain bike (near the grips), BMX & some old commuters. The Large Oi fits 23.8 to 31.8mm bars e.g. drop bar road bikes and some cruiser / commuters.