{"product_id":"sm-jc41-junction-unit","title":"Shimano SM-JC41 Junction Unit","description":"\u003csection class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-(--header-height)\" dir=\"auto\" data-turn-id=\"5b58563a-2a7c-405b-b9bf-a21ab7083320\" data-testid=\"conversation-turn-23\" data-scroll-anchor=\"false\" data-turn=\"user\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pt-12 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-message-author-role=\"user\" data-message-id=\"5b58563a-2a7c-405b-b9bf-a21ab7083320\" dir=\"auto\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden items-end rtl:items-start\"\u003e\n\u003cdiv class=\"user-message-bubble-color corner-superellipse\/0.98 relative min-w-0 overflow-hidden rounded-[22px] px-4 py-2.5 leading-6 max-w-(--user-chat-width,70%)\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto [content-visibility:auto] supports-[content-visibility:auto]:[contain-intrinsic-size:auto_100lvh] R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-WEB:5bf452a3-2b12-449b-93a7-5f454ce48d24-11\" data-testid=\"conversation-turn-24\" data-scroll-anchor=\"false\" data-turn=\"assistant\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"741738ae-0824-4d0e-96e6-670c9fc76018\" dir=\"auto\" data-message-model-slug=\"gpt-5-3\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" data-turn-start-message=\"true\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert w-full wrap-break-word light markdown-new-styling\"\u003e\n\u003cp data-start=\"0\" data-end=\"630\"\u003eKeep your Di2 system running seamlessly with the Shimano SM-JC41 Internal Junction Unit, the hidden hub that brings your entire electronic drivetrain together. Designed for internal cable routing, this compact junction box—commonly referred to as “Junction B”—acts as the central connection point for all key components, ensuring fast, reliable communication across your setup. Whether you’re building a clean new bike or upgrading an existing Di2 system, the SM-JC41 keeps everything neatly integrated and performing at its best. Simple, efficient, and essential, it’s the backbone of a smooth-shifting Shimano e-Tube experience.\u003c\/p\u003e\n\u003cp data-start=\"632\" data-end=\"649\"\u003e\u003cstrong data-start=\"632\" data-end=\"649\"\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"650\" data-end=\"1014\"\u003e\n\u003cli data-section-id=\"1xhoosn\" data-start=\"650\" data-end=\"711\"\u003eInternal Junction “B” unit for Shimano e-Tube Di2 systems\u003c\/li\u003e\n\u003cli data-section-id=\"189m2bf\" data-start=\"712\" data-end=\"804\"\u003eConnects front derailleur, rear derailleur, battery, and cockpit junction via SD50 wires\u003c\/li\u003e\n\u003cli data-section-id=\"1djogkv\" data-start=\"805\" data-end=\"873\"\u003eDesigned for clean internal cable routing and streamlined builds\u003c\/li\u003e\n\u003cli data-section-id=\"4zlqk7\" data-start=\"874\" data-end=\"946\"\u003eEnsures stable and reliable communication between all Di2 components\u003c\/li\u003e\n\u003cli data-section-id=\"7dw06p\" data-start=\"947\" data-end=\"1014\"\u003eCompact and lightweight design for easy integration into frames\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1016\" data-end=\"1168\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e\u003cstrong data-start=\"1016\" data-end=\"1039\"\u003eCompatibility Note:\u003c\/strong\u003e\u003cbr data-start=\"1039\" data-end=\"1042\"\u003eAll connected Di2 components must run the same firmware version to ensure optimal performance and prevent system malfunctions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e","brand":"Shimano","offers":[{"title":"Default Title","offer_id":49676778832158,"sku":"ISMJC41","price":39.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0681\/4633\/1934\/files\/shimano-17.png?v=1777970022","url":"https:\/\/giantosbornepark.com.au\/products\/sm-jc41-junction-unit","provider":"Giant Osborne Park","version":"1.0","type":"link"}