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Convertible mountain bike helmets<\/a> offer versatility on the trail with the protection of a full-face helmet<\/a> and the ventilation of an open-face lid in one package \u2013 you\u2019re essentially getting two great helmets for the price of one.<\/p>\n While a full-face offers better protection for the downs, there\u2019s no way you\u2019d want one on the ups. So, pedal up the hill in open-face mode before clipping the removable chin bar on so you\u2019re better protected as gravity takes over.<\/p>\n As with anything designed to be two things in one, there\u2019s always going to be a degree of compromise. Convertible enduro helmets tend to be a little heavier in open-face guise than a regular trail lid because they need extra structural elements to ensure they can be turned safely into a full-face helmet.<\/p>\n When they\u2019re in their descending configuration, they don\u2019t always feel as solid or robust as a full-on downhill lid, even though most convertible helmets (including all those tested here) meet the ASTM F-1952 DH racing safety standard.<\/p>\n Finally, don\u2019t forget, when the helmet\u2019s not in full-face mode, you need to carry the chin bar somehow.<\/p>\n As ever, we\u2019ve taken all of these factors into consideration in a bid to make your buying decision that bit easier.<\/p>\nBell Super DH MIPS<\/h2>