{"product_id":"box-box-four-prime-9-wide-rear-derailleur-rrdr0491-bicycle-rear-derailleur","title":"BOX Four Rear Derailleur - 8-Speed, Prime 9 Technology, Medium Cage, Sealed Bearing Pulleys, Limited Slip Clutch, Alloy \u0026 Nylon Components","description":"\u003cdiv id=\"seqbpdescription-1\"\u003e\u003cp\u003eUpgrade your bike's drivetrain with the BOX Four Rear Derailleur - an 8-speed, medium cage derailleur designed for superior performance, durability, and precision shifting. Engineered with advanced Prime 9 technology, this derailleur delivers less derailleur travel and a refined chainline for smoother gear changes, increased lifespan, and enhanced efficiency on every ride.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-2\"\u003e\u003cp\u003eConstructed with high-quality materials such as forged inner and outer cages, die-cast linkages, and sealed bearing pulleys, the BOX Four ensures long-lasting durability and consistent performance even in challenging riding conditions. The integrated Limited Slip Clutch system provides added chain retention and reduces chain slap, improving overall ride stability. The sealed bushing pulleys reduce friction and wear, making maintenance easier and maximizing your rear derailleur's lifespan.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-3\"\u003e\u003cp\u003eDesigned with versatility in mind, this derailleur is compatible with standard 10x1 derailleur hangers and supports gear ranges from 11 to 42 teeth, accommodating up to a 31-tooth capacity for versatile gearing options. Its sleek black finish complements any bike style, whether you're mountain biking, gravel riding, or commuting.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-4\"\u003e\u003cp\u003eKey features include:\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-5\"\u003e\u003cp\u003e- Prime 9 Technology for optimal chainline and reduced derailleur travel\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-6\"\u003e\u003cp\u003e- Limited Slip Clutch for enhanced chain stability\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-7\"\u003e\u003cp\u003e- Sealed bearing pulleys for durability and smooth shifting\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-8\"\u003e\u003cp\u003e- Forged and stamped cages for high strength\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-9\"\u003e\u003cp\u003e- Durable nylon composite knuckle and direct channel cable stay for precise alignment and shifting accuracy\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-10\"\u003e\u003cp\u003e- Compatibility with standard derailleur hangers (non-direct mount)\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-11\"\u003e\u003cp\u003e- Low weight at only 290g for performance without added bulk\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-12\"\u003e\u003cp\u003eBuilt for riders who demand reliability, precision, and style, the BOX Four Rear Derailleur is backed by a Limited Lifetime Warranty. Elevate your drivetrain performance and experience seamless shifting with this innovative, high-performance derailleur designed for serious cyclists and bike enthusiasts alike.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-13\"\u003e\u003cp\u003eOptimize your bike's shifting performance today-trust the factory-approved, authorized dealer for purchase.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpfeatures\"\u003e\u003cul\u003e\n\u003cli\u003e- Engineered with BOX Prime 9 Technology for precise 8-speed gear shifting, reduced derailleur travel, and optimized chainline, resulting in smoother performance and enhanced drivetrain efficiency. \u003c\/li\u003e\n\u003cli\u003e- Features a high-performance Limited Slip Clutch system that maintains chain tension under challenging riding conditions, minimizing chain drops and improving ride stability on rugged terrain. \u003c\/li\u003e\n\u003cli\u003e- Constructed with durable forged aluminum cages and sealed bearing pulleys, ensuring longevity, reduced wear, and reliable shifting performance in all weather conditions. \u003c\/li\u003e\n\u003cli\u003e- Incorporates innovative Pivot-Tech cable stay and direct channel cable routing for crisp, responsive shifts and simplified installation, suitable for versatile mountain or gravel bike setups. \u003c\/li\u003e\n\u003cli\u003e- Stylish black finish combined with versatile compatibility for standard 10x1 derailleur hangers, accommodating a wide range of bikes with a capacity of up to 31t, perfect for aggressive riding or commuting.\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/div\u003e","brand":"BOX","offers":[{"title":"Default Title","offer_id":42354481430595,"sku":"RRDR0491","price":68.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1608\/6187\/files\/BX5362.jpg?v=1779345936","url":"https:\/\/365cycles.com\/products\/box-box-four-prime-9-wide-rear-derailleur-rrdr0491-bicycle-rear-derailleur","provider":"365 Cycles","version":"1.0","type":"link"}