Knog Oi Bike Bell

The Oi is a small ring of CNC-machined 7075 aircraft-grade aluminum with a stainless-steel spring. You open it, slide it over the handlebar, and tighten one hex screw. There is a cable clip built in, so brake or shifter cables stay tidy underneath it instead of rattling around.

What stands out is how it sits on the bar. It reads as a clean, slim band of metal rather than a dome hanging off the front of the bike, which suits someone who cares how the cockpit looks. The ring gives a clear tone with a deep harmonic underneath, a more pleasant sound than the thin ding most small bells make. It comes in black, copper, brass, and aluminum finishes, so you can match it to the bike’s parts.

Fit is the detail to get right. The small size fits 22.2 mm bars and the large fits 23.8 to 31.8 mm, so measure your bar before choosing and decide where you want it mounted. If you are unsure of your bar diameter, you will be guessing, and a wrong guess means it won’t sit where you planned.