You wonrsquot find another helmet manufacturer with deeper roots in motocross much of what bell engineers learned from creating its award winning moto 9 helmet went into the bell full 9 full face mtb helmet take that unrivaled experience combine it with feedback from downhill and bmx champions and you have the winning formula the full 9 meets the most stringent astm downhill mountain bike racing certification as well as standard cpsc and ce bicycle safety benchmarks this full face mtb he