Shimano E-Tube Di2 Internal Junction B BoxShimano E Tube Di2 Internal Junction B Box The Shimano Di2 SM JC41 is designed to connect SD50 E tube wires along four points; front derailleur, rear derailleur, cockpit junction and battery mount. The B Box is used to split the main wire from Junction A to the front and rear derailleurs. It can also be used to connect a seatpost mounted battery to the system. Specifically designed for internally mounted systems for External use SM JC40.

DIMENSIONS: 30 x 18 x 6 cm/ 12 x 7 x 2

Smaller end fits 6-spline nipples with a 5

Kuat Dirtbag - Truck Bed Fork Mount - 15mm

For Newer Spider Carbon Shoes

The aggressive hook geometry provides ideal leverage when dealing with difficult tire beads

Shimano Deore XT T8000 SPD Pedals

The product is designed to not harm your components

A must-have for bike mechanics

Uses the 100-5D Micro-Adjustable clamp

Our Freehub Grease is a proven replacement for any hub or wheel companies grease

Still using a sealed

Dumonde Liquid Grease can be used to thin MR Grease to create a lighter weight viscosity if desired