Shimano BT DN300 Built In DI2 Battery Mountain Bike Helmets Be the first to rate

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Pass-through channels allow eyewear to be easily stored on the front of the helmet

These attachments then fit into an 8mm ball detent swivel head that has a 4mm opening for hex bits

Cassette/Freewheel 18t

Keep away from heat

Shimano BT DN300 Built In DI2 Battery Mountain Bike Helmets Be the first to rate"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