Shimano has simplified and improved the front junction box (junction A) for Di2. The new Di2 unit utilizes a rubber strap that cleanly and aerodynamically fastens underneath the stem. The junction box has a charging port that makes it possible to charge both internal and external batteries without having to remove them from the bike.
Features of Di2 Junction-A Box
Shimano Dura-Ace Di2 ST-9071 TT Shifters
Shimano Dura-Ace FC-9000 Crankset
Shimano Dura-Ace SM-BB9000 Bottom Bracket
Shimano Dura-Ace 9070 Front Derailleur
Shimano Dura-Ace 9070 Front Derailleur Adapter
Shimano Dura-Ace 9070 Rear Derailleur
Place an of $100 or more,
and receive a gift certificate
for 10% of your order total.
Most regular and sale items,
earn you 10% or more back.
Look for the red message on
each item page.
Some items only show rewards
when they have been added to your cart.
Simply enter your gift certificate
at the time of your next order.
Rewards are not transferrable,
or redeemable for cash or gift certificates.
Rewards will be adjusted on,
returns and to reflect any unearned value.
To receive your order by 12/24, consider the deadlines listed below:
For guaranteed Christmas arrival, items must be in stock at the time of the order. Also, the deadlines may be different for bikes, frames & wheels which require additional time for prep and assembly. Questions? Contact us.