Bell Stoker Bicycle Helmet. If you have an affinity for pushing the pace off road, then the Bell Stoker mountain Bicycle Helmet is up for the challenge. This go to, all mountain Bicycle Helmet has just the right combination of substance and style. With Overbrow Ventilation and extended rear coverage, the Stoker keeps you cool and confident while riding challenging terrain. And its superb features such as an adjustable visor and SpeedDial Fit System make it a great choice for any off road adventure.