Bell Stoker Mountain Bicycle Helmet. Hit the trails in style and perfect peace of mind with the Bell Stoker Mountain Bike Bicycle Helmet. This go to all mountain Bicycle Helmet delivers just the right combo of substance and style. With Bell's acclaimed Overbrow Ventilation and extended rear coverage, the Stoker keeps you cool and confident when faced with even the most challenging of terrain. For 2015, Bell created a new adjustable visor to keep sun and rain off your eyes plus a SpeedDial fit system to ensure this Bicycle Helmet fits like nothing you've ever worn before.