{"product_id":"tripeak-ema-jw1218a-shcb91","title":"TRiPEAK Asymmetric Oversized Pulley Wheel Kit for Shimano Dura-Ace R9100 – 12\/18T","description":"\u003cp\u003eThe TRiPEAK asymmetric oversized pulley wheel kit for Shimano Dura-Ace R9100 uses the listed 12\/18T tooth combination. Check the exact rear derailleur model, generation and cage designation against the specification below. A shared Shimano, SRAM or Campagnolo name does not make different derailleur versions interchangeable.\u003c\/p\u003e\u003ch2\u003eCompatibility and supplied specification\u003c\/h2\u003e\u003cp\u003e12\/18T AOPW Kits for Shimano R91xx series\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpecification:\u003c\/strong\u003e 12\/18T Asymmetric Oversized Pulley Wheel Kits for Shimano R91xx series\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eColor\u003c\/th\u003e\n\u003cth\u003ePart number\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003ctd\u003eEMA-JW1218A-SHCB91BK\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGold\u003c\/td\u003e\n\u003ctd\u003eEMA-JW1218A-SHCB91GD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSilver\u003c\/td\u003e\n\u003ctd\u003eEMA-JW1218A-SHCB91SV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDark Blue\u003c\/td\u003e\n\u003ctd\u003eEMA-JW1218A-SHCB91DB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Blue\u003c\/td\u003e\n\u003ctd\u003eEMA-JW1218A-SHCB91LB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGreen\u003c\/td\u003e\n\u003ctd\u003eEMA-JW1218A-SHCB91GR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRed\u003c\/td\u003e\n\u003ctd\u003eEMA-JW1218A-SHCB91RD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrange\u003c\/td\u003e\n\u003ctd\u003eEMA-JW1218A-SHCB91OR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePurple\u003c\/td\u003e\n\u003ctd\u003eEMA-JW1218A-SHCB91PL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePink\u003c\/td\u003e\n\u003ctd\u003eEMA-JW1218A-SHCB91PN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eChoosing this version\u003c\/h2\u003e\u003cp\u003eAOPW means asymmetric oversized pulley wheel. The larger pulley changes the chain’s path through the derailleur, so tooth count and model-specific mounting parts must match. AERO and EVO versions are separate product designs; choose by the supported derailleur and supplied parts rather than assuming all AOPW kits share the same fit.\u003c\/p\u003e\u003ch2\u003eInstallation checks\u003c\/h2\u003e\u003cp\u003eTRiPEAK’s \u003ca href=\"https:\/\/tripeakusa.com\/news\/keeps-the-whole-upgrade-fast-precise-and\"\u003eofficial AOPW upgrade article\u003c\/a\u003e describes retaining the original derailleur cage without requiring a longer chain. It also asks installers to check that chain length is appropriate for the bike’s setup. Follow the matching \u003ca href=\"https:\/\/tripeakusa.com\/support#manuals\"\u003eTRiPEAK installation manual\u003c\/a\u003e for the upper\/lower pulley positions and mounting parts, then check shifting and clearance through every gear.\u003c\/p\u003e\u003cdetails\u003e\u003csummary\u003eWill it fit a different generation of the same groupset?\u003c\/summary\u003e\u003cp\u003eOnly the models listed in this product’s specification are supported by the information here. Road AXS, XPLR, Eagle and T-Type are distinct applications. Check the full derailleur code and cage length before choosing a kit or wheel set.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhy use an 18T lower pulley?\u003c\/summary\u003e\u003cp\u003eTRiPEAK’s \u003ca href=\"https:\/\/tripeakusa.com\/news\/whats-the-benefit-of-a-bigger-pulley\"\u003e18T-versus-11T explanation\u003c\/a\u003e describes a gentler chain-bending angle with the larger pulley. The asymmetric mount accommodates the larger wheel in the supported original derailleur arm. Read \u003ca href=\"\/blogs\/news\/are-oversized-pulley-wheels-worth-it\"\u003ehow the AOPW upgrade works\u003c\/a\u003e for the design and fit details.\u003c\/p\u003e\u003c\/details\u003e\u003cp\u003eCompare \u003ca href=\"\/collections\/aopw-pulley-wheels\"\u003eTRiPEAK AOPW kits\u003c\/a\u003e and \u003ca href=\"\/collections\/pulley-wheels\"\u003epulley wheel sets\u003c\/a\u003e, or \u003ca href=\"\/pages\/contact\"\u003esend us your derailleur model\u003c\/a\u003e to check fit before ordering.\u003c\/p\u003e","brand":"TRiPEAK","offers":[{"title":"Black","offer_id":67736392040541,"sku":"EMA-JW1218A-SHCB91BK","price":180.0,"currency_code":"USD","in_stock":false},{"title":"Gold","offer_id":67736624726109,"sku":"EMA-JW1218A-SHCB91GD","price":180.0,"currency_code":"USD","in_stock":false},{"title":"Silver","offer_id":67736624758877,"sku":"EMA-JW1218A-SHCB91SV","price":180.0,"currency_code":"USD","in_stock":false},{"title":"Dark Blue","offer_id":67736624791645,"sku":"EMA-JW1218A-SHCB91DB","price":180.0,"currency_code":"USD","in_stock":false},{"title":"Light Blue","offer_id":67736624824413,"sku":"EMA-JW1218A-SHCB91LB","price":180.0,"currency_code":"USD","in_stock":false},{"title":"Green","offer_id":67736624857181,"sku":"EMA-JW1218A-SHCB91GR","price":180.0,"currency_code":"USD","in_stock":false},{"title":"Red","offer_id":67736624889949,"sku":"EMA-JW1218A-SHCB91RD","price":180.0,"currency_code":"USD","in_stock":false},{"title":"Orange","offer_id":67736624922717,"sku":"EMA-JW1218A-SHCB91OR","price":180.0,"currency_code":"USD","in_stock":false},{"title":"Purple","offer_id":67736624955485,"sku":"EMA-JW1218A-SHCB91PL","price":180.0,"currency_code":"USD","in_stock":false},{"title":"Pink","offer_id":67736624988253,"sku":"EMA-JW1218A-SHCB91PN","price":180.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0730\/1631\/1901\/files\/tripeak-pulley-import-82baf1425aff.png?v=1791905758","url":"https:\/\/precisionwatts.com\/products\/tripeak-ema-jw1218a-shcb91","provider":"Precision Watts","version":"1.0","type":"link"}