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It acts as the point the system is charged, provides ANT+ connection to 3rd party devises and replaces the handlebar junction\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eButton on the derailleur for Di2 operations, and LED light denotes synchronized shift mode, setting mode and charge requirements. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eProgrammed automatic motion at the touch of a switch makes this derailleur quick, smooth and effortless to shift. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eHigh tolerance cold forged aluminium link plates and body construction is extremely light and durable. Four self-lubricating micro-machined fluorine-coated link pivot bushings provide low-friction shifting. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e12-speed E-tube Di2 compatible\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWide gear ratio compatible up to 11-34T\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eShimano's fastest ever rear shifting, 58% faster than RD-R9150\u003c\/li\u003e\n\u003cli\u003eCompact design includes an integrated wireless unit, charger, and switch\u003c\/li\u003e\n\u003cli\u003eLED status indicator - Battery indicator - Pairing - Adjust mode, etc.\u003c\/li\u003e\n\u003cli\u003eWider range capacity - Max. low sprocket: 34T\u003c\/li\u003e\n\u003cli\u003eWeight: 262g\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/div\u003e","brand":"Shimano","offers":[{"title":"Default Title","offer_id":49200878485836,"sku":"SHIRDR8150","price":229.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0835\/5371\/4508\/files\/Screenshot_14-12-2024_154428_www.mdib2b.co.uk.jpg?v=1744983171"},{"product_id":"shimano-dura-ace-di2-r9250-12-speed-rear-derailleur","title":"Shimano Dura Ace Di2 R9250 12 Speed Rear Derailleur","description":"\u003cp\u003e\u003cspan\u003eThe new 12-speed DURA-ACE R9200 is t\u003c\/span\u003eheir fastest ever shifting across SHIMANO's widest ever DURA-ACE gear range, the RD-R9250 is capable of both race wins and personal bests.\u003c\/p\u003e\n\u003cdiv class=\"cmp-itemlist-accordion\"\u003e\n\u003cdiv class=\"cmp-itemlist-accordion__accordion-section cmp-itemlist-accordion__accordion-section--is-opened\"\u003e\n\u003cdiv data-final-height=\"102.375\" data-starting-height=\"28\" class=\"cmp-itemlist-accordion__contents\"\u003e\n\u003cp class=\"cmp-product-info__long-description\"\u003eThe DURA-ACE RD-R9250 integrates the system charging port and a wireless connectivity unit all while delivering super fast, precise shifting worth of any podium. 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Semi synchronized shifting means when a front shift is made the rear mech will automatically correct to the appropriate ratio\u003c\/p\u003e\n\u003cp\u003e- Simply pressing tactile buttons allows effortless and comfortable shifting even when your hands are cold\u003c\/p\u003e\n\u003cp\u003e- Drop bar STI with shift buttons located in a near identical place to the positions you'd assume shifting using a mechanical Shimano STI\u003c\/p\u003e\n\u003cp\u003e- Servo Wave brake lever pivot is positioned to be used with super SLR brake callipers, increase power providing excellent ergonomics when riding on the hoods\u003c\/p\u003e\n\u003cp\u003e- Finely tuneable reach adjusters for the levers enable custom fitment for all hands\u003c\/p\u003e\n\u003cp\u003e- Wired connection to the front and rear derailleurs with SD300 series wires\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWeight: 295g\u003c\/li\u003e\n\u003cli\u003eExcludes Di2 Cables\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eLeft shifter is 2-speed, right shifter is 12-speed\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Shimano","offers":[{"title":"Default Title","offer_id":51784494448972,"sku":"SHISTR8150PA","price":319.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0835\/5371\/4508\/files\/Screenshot_15-1-2025_132336_www.biketart.com.jpg?v=1744983241"},{"product_id":"shimano-ultegra-st-r8170-12-speed-hydro-disc-di2-sti-levers-and-calipers","title":"Shimano Ultegra ST-R8170 12 Speed Hydro Disc Di2 STI Levers and Calipers","description":"\u003cp\u003eShimano Ultegra ST-R8170 12sp Hydro Disc Di2 STI Levers and Flat Mount Brakes\u003cbr\u003eIncludes Left and Right Shifters, Hoses, Front and Rear Calipers\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eClean Cockpit: Wireless connection enhances the aerodynamic effect and easy maintenance\u003c\/li\u003e\n\u003cli\u003eUnparalleled ergonomics engineering refined with pros' feedback - Raised hood peak improves ergonomics\u003c\/li\u003e\n\u003cli\u003eOptimized brake control - Lighter, smoother lever action - Enhanced modulation thanks to an expanded braking control area\u003c\/li\u003e\n\u003cli\u003eCompatible with wired and wireless connection\u003c\/li\u003e\n\u003cli\u003eAvailable to additional satellite shifters\u003c\/li\u003e\n\u003cli\u003eHigh electronic energy efficiency - 1.5 to 2 years of battery life with easy-to-change CR1632 shifter batteries\u003c\/li\u003e\n\u003cli\u003eWeight: 391g\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Shimano","offers":[{"title":"Default Title","offer_id":51784527970636,"sku":"SHISTR8170DPA","price":593.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0835\/5371\/4508\/files\/Screenshot_15-1-2025_133123_d3n8mmvj9ns1ml.cloudfront.net.jpg?v=1744982928"},{"product_id":"shistr9270dpa","title":"Shimano Dura Ace ST-R9270 12 Speed Hydro Disc Di2 STI Levers and Brakes","description":"\u003cp\u003e\u003cspan\u003eThe new 12-speed DURA-ACE R9200 - Shimano Dura Ace ST-R9270 12 speed Hydro Disc Di2 STI Levers and Flat Mount Brakes\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eIncludes Left and Right Shifters, Hoses, Front and Rear Calipers\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe all-new Shimano ST-R9270 12 Speed Drivetrain is Shimano's sleekest, lightest and fastest road drivetrain to date. 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Heat-treated alloy tool steel construction for a lifetime of use.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cul class=\"description-overview\"\u003e\n\u003cli\u003e12-splines, 23.4mm diameter\u003c\/li\u003e\n\u003cli\u003eFits Shimano®, SRAM® (including 1x), SunRace®, SunTour®, Chris King® and other cassette lockrings\u003c\/li\u003e\n\u003cli\u003eAlso fits some Shimano® disc brake lockrings\u003c\/li\u003e\n\u003cli\u003eMade in the USA and covered by Park Tool's legendary limited lifetime warranty\u003c\/li\u003e\n\u003cli\u003eCenter bore for axle clearance is 12 mm\u003c\/li\u003e\n\u003cli\u003e1\" hexagonal base can be used with 1\" socket or wrench\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003ciframe title=\"FR-5.2 Cassette Lockring Tool\" src=\"https:\/\/www.youtube.com\/embed\/4mJOwseZNK0\" height=\"440\" width=\"783\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e","brand":"Park Tool","offers":[{"title":"Default Title","offer_id":52062976278860,"sku":"PBPPARKFR52","price":9.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0835\/5371\/4508\/files\/Screenshot_27-2-2025_142152_www.parktool.com.jpg?v=1744982859"},{"product_id":"park-fr-5-2gt-cassette-locking-tool-with-12mm-pin","title":"Park FR-5.2GT Cassette Locking Tool with 12mm Pin","description":"\u003cp\u003e\u003cspan\u003eThe dependable design of our FR-5.2 lockring tool with an added 12 mm guide pin to stabilize the tool when used with thru axle hubs. 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Heat-treated alloy tool steel construction for a lifetime of use.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cul class=\"description-overview\"\u003e\n\u003cli\u003eThe FR-5.2GT is designed specifically for use when removing and installing cassette lockrings from thru axle hubs\u003c\/li\u003e\n\u003cli\u003eUtilizes a 12mm guide pin to stabilize the tool in use\u003c\/li\u003e\n\u003cli\u003eFits 12-spline cassette lockrings from Shimano® , SRAM® (including 1x), SunRace® , SunTour® , Chris King® and others (23.5mm diameter)\u003c\/li\u003e\n\u003cli\u003eFits some Shimano® and similar disc brake rotor lockrings\u003c\/li\u003e\n\u003cli\u003eMade in the USA and covered by Park Tool's legendary limited lifetime warranty\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e1\" hexagonal base can be used with 1\" socket or wrench\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003ciframe title=\"FR 5.2GT Cassette Lockring Tool with 12mm Guide Pin\" src=\"https:\/\/www.youtube.com\/embed\/AEc8m3VmM1A\" height=\"440\" width=\"783\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e","brand":"Park Tool","offers":[{"title":"Default Title","offer_id":52063047090508,"sku":"PBPPARKFR52GT","price":11.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0835\/5371\/4508\/files\/Screenshot_27-2-2025_143557_www.parktool.com.jpg?v=1744982857"},{"product_id":"shimano-dura-ace-r9200-12-speed-cassette","title":"Shimano Dura Ace R9200 12 Speed Cassette","description":"\u003cp\u003e\u003cspan\u003eSuper lightweight 12speed HG+ cassette with a rigid carbon and alloy carrier for excellent shifting even under the most demanding gear changes\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eHyperglide+ sprockets have a computer designed tooth configuration with contoured shift gates, resulting in a crisp smooth shift even under load\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eClose ratio gearing allows a more efficient use of energy through finer cadence control\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eLargest sprockets are mounted on lightweight alloy and carbon carriers to reduce weight and increase rigidity\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e5 largest sprockets are made from titanium to reduce weight without sacrificing strength\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSprockets are extensively cut away and drilled to further reduce weight without reducing rigidity\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eNickel-plated finish offers hard wearing resistance to corrosion\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eAlloy cassette lockring\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eFor Super Narrow 12-speed chains\u003c\/span\u003e\u003c\/p\u003e","brand":"Shimano","offers":[{"title":"11-30T","offer_id":52556745605452,"sku":"SHICSR920012130","price":224.99,"currency_code":"GBP","in_stock":true},{"title":"11-34T","offer_id":52556745638220,"sku":"SHICSR920012134","price":263.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0835\/5371\/4508\/files\/Screenshot_16-11-2024_151952_djm-aaa1.kxcdn.com_4f58d339-ffcc-4d6e-93fc-16bbfc6e3b25.jpg?v=1747309371"},{"product_id":"shimano-dura-ace-r9100-11-speed-cassette-11-25","title":"Shimano Dura Ace R9100 11 Speed Cassette (11-25)","description":"\u003cp\u003eShimano's Dura Ace R9100 cassette is a super lightweight 11 speed cassette with Hyperglide EV sprockets and close ratio gearing for finer cadence control\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"c1\"\u003eSpecification\u003c\/span\u003e:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHyperglide EV sprockets\u003c\/li\u003e\n\u003cli\u003eClose ration gearing\u003c\/li\u003e\n\u003cli\u003e5 largest sprockets are titanium\u003c\/li\u003e\n\u003cli\u003eSprockets cut out and drilled to reduce weight - no reduction in stiffness\u003c\/li\u003e\n\u003cli\u003eNickel plated finish\u003c\/li\u003e\n\u003cli\u003eAlloy cassette lockring\u003c\/li\u003e\n\u003cli\u003eCarbon\/alloy carrier\u003c\/li\u003e\n\u003cli\u003eOEM part unboxed\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eWeight: 175g (11-25)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Shimano","offers":[{"title":"11-25T","offer_id":53391368487244,"sku":"SHICSR910011125","price":59.99,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0835\/5371\/4508\/files\/ShimanoDuraAceR9100Cassette.webp?v=1758227602"},{"product_id":"shimano-hg601-105-r7000-11-speed-chain-124l","title":"Shimano HG601 105 R7000 11 Speed Chain 124L","description":"\u003cp\u003e\u003cspan\u003eThe HG601-11 chain from Shimano is directional and features SIL-TEC treatment on the pin link plate for increased durability. 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