Shimano SM-JC40 Di2 External Frame Junction Box 4-Port CheckoutTitle=Reserve Wheels Reserve 25 Rim - 650b }Hayes Dominion T2 Disc Caliper

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MegaTooth technology ensures chain stays secure

Adjustable footrests and straps keep small feet away from spinning wheels

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Its stiff secure and light weight with a sleek design that compliments any bike

Shimano SM-JC40 Di2 External Frame Junction Box 4-Port CheckoutTitle=Reserve Wheels Reserve 25 Rim - 650b }Hayes Dominion T2 Disc CaliperShimano SM JC40 Di2 External 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