A bell with a beautiful tone, but also a remarkable style and choice of materials that embodies a rider’s personality. The Large size fits 23.8 – 31.8mm bars, while the Small fits 22.2mm bars. A new addition to our beloved Oi Range, the Prima features our new “Wave-Tek” hammer technology. The updated hammer design means a more consistent tone and a slight increase in the bell’s volume. The strike of the bell on the Oi Prima is still firm and fast, allowing a good balance of volume and longevity of sound. The Oi Prima fits on most bars in the market; just pop it over your handlebar, give the hex screw a quick tighten up, and you’re good to go. One of the pain points on many bikes is the handlebar cables getting in the way of exisiting bell designs. Not on the Oi Prima. Built into the shape of the mount is a handy cable management system.