Shimano SM-JC41 Di2 Internal Frame Junction Box 4-Port

Shimano SM-JC41 Di2 Internal Frame Junction Box 4-PortShimano SM JC41 Di2 Internal Frame Junction Box 4 Port. Shimano Di2 Frame Junction BoxFrame Junction Box connects via SD50 E tube wires to four different points: front derailleur rear derailleur cockpit junction box and battery mount All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions Use Di2 system checker to update component firmware from http: e

The Fox Fork Lower Seal Driver Tool is the best way to press in new seals

110 year warrranty

Finished with a distinct dual-spoke design your shifting will never be compromised

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Contoured to fit traditional sized steel downtubes

Diameter 700C Front/Rear or Set Front ID Width (mm) 17 Axle Size QR Rim Color Blk Rim Model ARC 1400 Hub Model ARC 1400 Dicut Aero Hub Spacing 100 Hub Color Blk Gears Brake Type RIM Spoke Type DT Aero Comp Spoke Count 20H Wall Dbl Valve Type PV

IMPORTANT: Before ordering make sure your specific trainer will accommodate the width of the thru-axle equipped bike that you are using

The lightweight and welded aluminum rim laced with competition spokes and reliable 350 hub create a snappy accelerating wheel