Really Rick? The idea behind a bell is that the bear will hear it long before the collision and move away. I have spent 38 years hunting and observing bears in our wilds and with a few cranky exceptions feel they will avoid human contact if offered a choice. One point glossed over here is the need for caution particularly on downhills by mountain bikers. No bias here as I do both but I've witnessed numerous occasions on two way trails where bikers took blind corners with far too much speed to react. You could be puttting a group of little girls hikers at risk of serious injury as easily as a bear.