An ideal choice for commuters, road riders, gravel cyclists and anyone who wants reliable bell communication without a bulky bell dominating the handlebar.
The Oi Prima is built for riders who want a bell that integrates neatly into the cockpit. Its signature wrap-around design keeps the profile low and streamlined, while the Large size fits 23.8–31.8 mm handlebars. The included shims help fine-tune the fit, and the hinged clamp makes installation quicker without needing to bend the bell open.
The new WAVETEK hammer gives the Prima a clear, consistent chime with an output of 80+ dB. In day-to-day use, it delivers a pleasingly crisp ring that attracts attention on shared-use paths and roads, without the harsh sound of some louder traditional bells. The covered spring is designed to resist overextension, and testing on rough tracks found no false ringing.
Choose the Oi Prima when you want a refined-looking bell that feels solid, fits neatly around your handlebar and remains easy to operate. It is not compatible with aero bars, and traditional large brass bells may be louder in especially noisy environments, but for a discreet everyday bell the Prima offers a strong balance of sound, fit and finish.
Low-profile wrap-around design
Blends neatly into the handlebar, giving you useful bell functionality without the look of a conventional bulky bell.
WAVETEK hammer technology
The wave-like hammer motion creates a crisp, consistent chime designed to carry clearly when you need to alert others.
80+ dB sound output
Loud enough for everyday shared paths and road use, while retaining a pleasant rather than harsh tone.
Hinged clamp installation
The hinged gate makes fitting faster and helps avoid the damage risk associated with bending open a traditional clamp.
Large handlebar fit
Designed for 23.8–31.8 mm bars, with shims included to help achieve a secure fit across compatible handlebar diameters.
Protected spring mechanism
The hidden spring cannot be overextended, supporting a clean appearance and durable operation.
Cable-friendly mounting
The mount leaves space for cables underneath, making it easier to position on a range of compatible cockpit setups.
Compact and lightweight
At 28 g, it adds minimal weight while giving your bike a practical audible warning signal.
General
Dimensions & weight
Compatibility
Materials & construction
Features
What's included
WAVETEK
Our WAVETEK hammer uses a subtle wave-like motion to deliver a louder, longer-lasting and more consistent chime with a crisp, clear tone.
Wrap-around design
The low-profile bell wraps around the handlebar for a discreet, streamlined fit.
Hinged clamp system
The hinged clamp makes installation quicker, easier and secure while helping the bell stay firmly positioned.
GF Nylon and TPU hammer
The hammer combines GF Nylon and TPU to support a robust, long-lasting striking mechanism.
Technically UnKonventional
Knog is an Australian accessories brand founded in Melbourne in 2002 by Hugo Davidson and Mal McKechnie. The company built its name on cycling products that combine industrial design, everyday usability and a distinct visual identity, and it has expanded from bike accessories into selected outdoor gear as well.
Knog is especially well known for rethinking familiar products in a more design-led way, with major products including the Frog light, the Oi bell and the Cobber light range. Its products and brand have received multiple design awards over the years, including Australian Good Design and Eurobike-related recognition.
