I have to admit that I do not always have a proper bell on my race bike as it is hard to find something that fits nicely. But I definitely needed a loud one when participating in an endurance bike messenger race around the Netherlands going though large parts of urban area (https://tourdeville.nl/24uurs/). From the bells that I had laying around I found that this one would fit nicely under my stem. After some bending of the clamp I could fix it with the bolt of my bike computer mount. It is loud, easy to reach en just hidden away enough to still be on my bike after three months. Best of all it was proven in use as I won the race (http://www.strava.com/activities/2689107798).
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