{"product_id":"ultra-bee-brake-kit-for-e-bikes-super73-macfox-ridstar","title":"Super73 Ultra Bee Brake Kit for E-Bikes | Macfox, Ridstar","description":"\u003cp\u003eThis Ultra Bee brake kit for e-bikes swaps the stock bicycle-style rear brake on Super73, Macfox, Ridstar, Zooz, and Freego bikes for a moto-grade Ultra Bee caliper on a 220mm rotor. It ships pre-bled and bolts to the stock rear brake mount. No cutting, no fabrication.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's in the box?\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 rear brake system, pre-bled: FactoryZ Custom or OEM Surron caliper with a steel-braided brake line to an OEM Surron master cylinder, filled with Motul DOT 5.1 brake fluid\u003c\/li\u003e\n  \u003cli\u003e1 rotor\u003c\/li\u003e\n  \u003cli\u003e1 caliper bracket\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecs:\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eShips pre-bled with Motul DOT 5.1 brake fluid - the hydraulic system is filled and bled before it leaves us, so there is no bleeding on install.\u003c\/li\u003e\n  \u003cli\u003e220mm x 2.3mm solid rotor, FactoryZ high carbon stainless steel - a bigger disc gives the caliper more leverage over the rear wheel.\u003c\/li\u003e\n  \u003cli\u003e6061-T6 aluminum caliper bracket, anodized - adapts the stock rear brake mount to the Ultra Bee caliper. Bolt-on.\u003c\/li\u003e\n  \u003cli\u003eOEM Surron master cylinder - the factory Surron lever and reservoir.\u003c\/li\u003e\n  \u003cli\u003eSteel-braided brake line - holds its shape under pressure for a consistent lever.\u003c\/li\u003e\n  \u003cli\u003eFactoryZ Custom caliper - mechanically the Gen1 Surron Ultra Bee caliper, minus the branding. The lower-cost option.\u003c\/li\u003e\n  \u003cli\u003eOEM Surron caliper - the genuine 2025\/2026 Surron-branded caliper with revised internal oil routing, roughly 5% larger. The true OEM part.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFits these models:\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eSuper73 ZX\u003c\/li\u003e\n  \u003cli\u003eSuper73 RX\u003c\/li\u003e\n  \u003cli\u003eSuper73 S2\u003c\/li\u003e\n  \u003cli\u003eMacfox X1\u003c\/li\u003e\n  \u003cli\u003eMacfox X1S\u003c\/li\u003e\n  \u003cli\u003eMacfox X2 (\u003cstrong\u003ewith 180mm post mount adapter\u003c\/strong\u003e)\u003c\/li\u003e\n  \u003cli\u003eMacfox X7 (\u003cstrong\u003ewith 180mm post mount adapter\u003c\/strong\u003e)\u003c\/li\u003e\n  \u003cli\u003eRidstar Q20\u003c\/li\u003e\n  \u003cli\u003eRidstar Q20 Pro\u003c\/li\u003e\n  \u003cli\u003eRidstar E26\u003c\/li\u003e\n  \u003cli\u003eZooz Ultra Urban (also called the UU)\u003c\/li\u003e\n  \u003cli\u003eFreego X1\u003c\/li\u003e\n  \u003cli\u003eFreego X2 Pro\u003c\/li\u003e\n  \u003cli\u003eFreego X3 Pro\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSome Macfox models need the stock brake post swapped for a standard 180mm post mount adapter before the bracket fits. We do not stock it. \u003ca href=\"https:\/\/www.amazon.com\/dp\/B08D9JRTGB\"\u003eThis is the one we recommend.\u003c\/a\u003e\u003c\/p\u003e\n\n\u003ch2\u003eUltra Bee Brake Kit for E-Bikes FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill this fit my Super73?\u003c\/h3\u003e\n\u003cp\u003eYes, on the Super73 ZX, RX, and S2. The caliper bracket bolts to the stock rear brake mount. Check the full list above for Macfox, Ridstar, Zooz, and Freego.\u003c\/p\u003e\n\u003ch3\u003eDo I need any other parts?\u003c\/h3\u003e\n\u003cp\u003eOn most listed bikes, no. The Macfox X2 and X7 need a standard 180mm post mount adapter in place of the stock brake post. It is inexpensive and linked above.\u003c\/p\u003e\n\u003ch3\u003eIs it pre-bled?\u003c\/h3\u003e\n\u003cp\u003eYes. The caliper, steel-braided line, and master cylinder arrive filled and bled as one system. Mount it, route the line, and set the lever.\u003c\/p\u003e\n\u003ch3\u003eHow hard is the install?\u003c\/h3\u003e\n\u003cp\u003eBolt-on. No cutting, drilling, or fabrication. You remove the stock rear brake, mount the bracket and rotor, and bolt up the caliper and master cylinder.\u003c\/p\u003e\n\u003ch3\u003eWhich caliper should I pick?\u003c\/h3\u003e\n\u003cp\u003eThe FactoryZ Custom caliper is the Gen1 Ultra Bee design without the Surron logo, at a lower price. The OEM Surron caliper is the current genuine Surron part, slightly larger with revised oil routing. Both bolt to the same bracket.\u003c\/p\u003e\n\u003ch3\u003eIs this a front or rear brake?\u003c\/h3\u003e\n\u003cp\u003eRear only. Your front brake stays stock.\u003c\/p\u003e\n\u003ch3\u003eWhat brake fluid does it use?\u003c\/h3\u003e\n\u003cp\u003eMotul DOT 5.1. The kit ships filled with it, so top off or rebleed with the same fluid. Do not mix in mineral oil.\u003c\/p\u003e\n\u003ch3\u003eCan I get a different rotor size?\u003c\/h3\u003e\n\u003cp\u003eNo. The kit ships with one rotor: the FactoryZ 220mm x 2.3mm solid rotor, matched to the included bracket.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eShips from USA!\u003c\/strong\u003e\u003c\/p\u003e","brand":"FactoryZ","offers":[{"title":"Ultra Bee Custom (Green FactoryZ Caliper) \/ Black","offer_id":60103900659998,"sku":"SUPER73-ULTRA-BEE-BRAKE-KIT-CUSTOM-BLACK","price":279.99,"currency_code":"USD","in_stock":true},{"title":"Ultra Bee Custom (Green FactoryZ Caliper) \/ Silver","offer_id":60103907705118,"sku":"SUPER73-ULTRA-BEE-BRAKE-KIT-CUSTOM-SILVER","price":279.99,"currency_code":"USD","in_stock":true},{"title":"OEM Surron Brand (Green Caliper) \/ Black","offer_id":60103900692766,"sku":"SUPER73-ULTRA-BEE-BRAKE-KIT-OEM-BLACK","price":369.99,"currency_code":"USD","in_stock":true},{"title":"OEM Surron Brand (Green Caliper) \/ Silver","offer_id":60103907737886,"sku":"SUPER73-ULTRA-BEE-BRAKE-KIT-OEM-SILVER","price":369.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0738\/7548\/9054\/files\/super73-ultra-bee-brake-kit-custom-black.webp?v=1790950281","url":"https:\/\/factoryz.co\/products\/ultra-bee-brake-kit-for-e-bikes-super73-macfox-ridstar","provider":"FactoryZ","version":"1.0","type":"link"}