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Shimano EW JC304 Di2 Junction Box 4 Ports Use With EW SD300 CheckoutSpec= 60 TPI Compatible with LINKGLIDE AND HG SP0409 Compatible with LINKGLIDE AND HG 11 speed chains Anodized alloy finish Bearing Type Loose Ball Cassette Body Type 3 Prong Cog Color Silver Defined Color Silver Drivetrain Speeds 3 Hub Drilling 32 Hub Brake Compatibility 6 Bolt Disc Skewer Included No Spoke Interface J Bend Weight 1095 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
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