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520mm width
Pass-through channels allow eyewear to be easily stored on the front of the helmet
Designed to hold up to 100lb/46kg of cargo
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Shimano BT DN300 Built In DI2 Battery Mountain Bike Helmets 520mm width"The new DN300 battery features the same waterproof design that Di2 users have loved for generations. Now with 3 ports, it delivers stable power to Shimano's 12 speed road derailleurs and shifters (if a fully wired option is selected). With the same size as its predecessor, the slim DN300 battery can be housed inside seat posts or frames ensuring a clean aesthetic. Now with 3 ports, the DN300 simplifies wiring to front and rear derailleurs, supplying