{"product_id":"shimano-ultegra-r8100-di2-12-speed-tt-groupset-disc-brake","title":"Shimano Ultegra R8100 Di2 12-Speed TT Groupset (Disc Brake)","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cstrong\u003eDura-Ace Performance Where It Matters. Ultegra Value Where It Doesn't.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eThe Shimano Ultegra R8100 Di2 12-speed TT groupset delivers identical shifting speed, identical Synchronized Shift logic and identical 12-speed gearing to Dura-Ace — at a price that leaves budget for a power meter or race wheels. For triathletes and time triallists building a serious race bike, this is the smart money.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eThis is a dedicated disc brake TT configuration, not a road groupset you'll need to adapt. Because Shimano's only hydraulic disc TT lever is the Dura-Ace ST-R9180, we spec it here as standard — so you get genuine Dura-Ace controls on your base bar, paired with SW-R9160 extension shifters for full shifting from the aero position. Ultegra derailleurs, crankset, cassette and calipers handle the rest with pro-team reliability.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eEvery component listed below ships in the box — derailleurs, crankset, cassette, chain, TT levers, calipers, rotors, extension shifters, battery and charger.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cstrong\u003eWhy triathletes and TT riders choose Ultegra R8100:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul dir=\"ltr\" class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eThe same Di2 shifting speed and Synchronized Shift brain as Dura-Ace\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eGenuine Dura-Ace ST-R9180 hydraulic TT levers included as standard\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eShift from the extensions or the base bar without breaking your tuck\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eHydraulic disc braking with confident modulation in all weather\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eDedicated TT controls: hydraulic base bar levers plus bar-end extension shifters\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 dir=\"ltr\" class=\"text-text-100 mt-2 -mb-1 text-base font-bold\"\u003eWhat's Included — Complete Contents\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eEverything listed below is included in this groupset:\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cstrong\u003eDrivetrain — included\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul dir=\"ltr\" class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e1× Shimano Ultegra RD-R8150 Di2 12-speed rear derailleur\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e1× Shimano Ultegra FD-R8150 Di2 front derailleur\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e1× Shimano Ultegra FC-R8100 crankset (choose chainring and crank length at checkout)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e1× Shimano Ultegra CS-R8100 12-speed cassette 11-34T\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e1× Shimano CN-M8100 12-speed chain\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cstrong\u003eBraking — included\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul dir=\"ltr\" class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e1 pair Shimano Dura-Ace ST-R9180 TT hydraulic disc dual control levers (left + right)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e2× Shimano Dura-Ace BR-R9270 hydraulic disc calipers (front + rear)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e2× Shimano RT-CL800 rotors with lockrings (front + rear) — choose your size combination at checkout: 160mm\/160mm, 160mm front with 140mm rear, or 140mm\/140mm\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e2× Shimano SM-BH90 hydraulic hoses (front + rear)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cstrong\u003eTT Cockpit Controls — included\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul dir=\"ltr\" class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e1 pair Shimano SW-R9160 Di2 bar-end extension shifters (left + right)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cstrong\u003eElectronics — included\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul dir=\"ltr\" class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e1× Shimano BT-DN300 internal Di2 battery\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e1× Shimano EW-EC300 charging cable\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cstrong\u003eNot included\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul dir=\"ltr\" class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eDi2 wiring kit (junction box, E-Tube wires, splitter and adapter) — sold separately, as wire lengths depend on your frame and cockpit setup\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBottom bracket — sold separately to suit your frame standard (press-fit or threaded)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cstrong\u003eGood to know\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul dir=\"ltr\" class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e2×12-speed. Synchronized Shift enabled as standard (required for TT configuration)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eAll shift units supplied with current 12-speed firmware installed\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Shimano","offers":[{"title":"Ultegra standard - no powermeter \/ 160mm 50-34T \/ 160\/160","offer_id":53477255119137,"sku":null,"price":1499.0,"currency_code":"GBP","in_stock":true},{"title":"Ultegra standard - no powermeter \/ 160mm 50-34T \/ 160\/140","offer_id":53477255151905,"sku":null,"price":1499.0,"currency_code":"GBP","in_stock":true},{"title":"Ultegra standard - no powermeter \/ 160mm 50-34T \/ 140\/140","offer_id":53477255184673,"sku":null,"price":1499.0,"currency_code":"GBP","in_stock":true},{"title":"Ultegra standard - no powermeter \/ 160mm 52-36T \/ 160\/160","offer_id":53477255217441,"sku":null,"price":1499.0,"currency_code":"GBP","in_stock":true},{"title":"Ultegra standard - no powermeter \/ 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