Shimano Di2 Junction A SM-EW90-B 5 Port 42mm A single rear derailleur for

A single rear derailleur for all gearing combinations

intuitive smart navigation

but the seams are too close together to be fully taped)

Disc IS 6-bolt Spoke Type Sapim Skewers Included No Rim Construction Double wall Rim Internal Width 94mm Rim Material Aluminum Rim Model Evo JP95 Wheel Diameter/ISO 27

The dirtier the ride

Shimano Di2 Junction A SM-EW90-B 5 Port 42mm A single rear derailleur forThe Shimano SM EW90 E Tube Cockpit Junction Boxes link your Di2 shifters to the main frame junction box using SD50 E tube wires. Serving as the OEM front wiring kit for Dura Ace Di2 9070, this component streamlines your electronic shifting setup. This functional unit features an integrated LED battery charge level indicator, a rear derailleur adjustment mode, and an internal battery charging port. All connected Di2 components require matching firmware