{"product_id":"ronstan-rf28109-25mm-single-pulley","title":"Ronstan RF28109 Series 25 Orbit Ball Bearing Single Pulley","description":"\u003cp data-start=\"257\" data-end=\"685\"\u003eThe Ronstan RF28109 Series 25 Orbit Ball Bearing Single Pulley is a lightweight, low-friction sailing block designed for high-performance dinghy, skiff, trailer sailer, and sports boat applications in demanding New Zealand sailing conditions. As part of Ronstan’s advanced Orbit Block™ range, the RF28109 delivers exceptional strength, smooth line handling, and minimal weight for efficient sail control and racing performance.\u003c\/p\u003e\n\u003cp data-start=\"687\" data-end=\"1161\"\u003eFeaturing a compact 25mm acetal sheave and Ronstan’s advanced 2-stage ball bearing system, the RF28109 provides extremely low-friction operation under both static and dynamic loads. The Orbit Block™ design uses fibre-reinforced nylon cheeks and a stainless steel load frame to achieve an excellent strength-to-weight ratio while maintaining reliable long-term marine durability. Ronstan specifically designed the Orbit range for “high dynamic and static load applications.”\u003c\/p\u003e\n\u003cp data-start=\"1163\" data-end=\"1572\"\u003eThe RF28109 features a loop-top attachment system that allows lightweight soft attachment rigging without metal shackles, reducing weight and improving flexibility in modern racing systems. Its compact low-profile design makes it ideal for mainsheet systems, vang cascades, cunninghams, barber haulers, control lines, and spinnaker sheet turning systems where lightweight low-friction performance is critical.\u003c\/p\u003e\n\u003cp data-start=\"1574\" data-end=\"1741\"\u003eSuitable for ropes up to 8mm diameter, the Ronstan RF28109 is trusted by competitive sailors worldwide for dependable performance in high-load sailing control systems.\u003c\/p\u003e\n\u003chr data-start=\"1743\" data-end=\"1746\"\u003e\n\u003ch2 data-section-id=\"1ma7m6t\" data-start=\"1748\" data-end=\"1763\"\u003eKey Features\u003c\/h2\u003e\n\u003cul data-start=\"1765\" data-end=\"2191\"\u003e\n\u003cli data-section-id=\"757z1h\" data-start=\"1765\" data-end=\"1802\"\u003eGenuine Ronstan RF28109 Orbit Block\u003c\/li\u003e\n\u003cli data-section-id=\"128kye3\" data-start=\"1803\" data-end=\"1836\"\u003e25mm single ball bearing pulley\u003c\/li\u003e\n\u003cli data-section-id=\"1tbshmv\" data-start=\"1837\" data-end=\"1877\"\u003eLightweight loop-top attachment design\u003c\/li\u003e\n\u003cli data-section-id=\"9x5tz3\" data-start=\"1878\" data-end=\"1916\"\u003eAdvanced 2-stage ball bearing system\u003c\/li\u003e\n\u003cli data-section-id=\"dkuh1h\" data-start=\"1917\" data-end=\"1951\"\u003eExtremely low-friction operation\u003c\/li\u003e\n\u003cli data-section-id=\"q6f1kv\" data-start=\"1952\" data-end=\"1983\"\u003eFibre-reinforced nylon cheeks\u003c\/li\u003e\n\u003cli data-section-id=\"vjqgjb\" data-start=\"1984\" data-end=\"2021\"\u003eStainless steel internal load frame\u003c\/li\u003e\n\u003cli data-section-id=\"8q39gs\" data-start=\"2022\" data-end=\"2056\"\u003eCompact lightweight construction\u003c\/li\u003e\n\u003cli data-section-id=\"1ef14gi\" data-start=\"2057\" data-end=\"2099\"\u003eIdeal for dinghy and sports boat rigging\u003c\/li\u003e\n\u003cli data-section-id=\"171wob0\" data-start=\"2100\" data-end=\"2133\"\u003eSuitable for high dynamic loads\u003c\/li\u003e\n\u003cli data-section-id=\"88iatq\" data-start=\"2134\" data-end=\"2156\"\u003eSuits up to 8mm rope\u003c\/li\u003e\n\u003cli data-section-id=\"1qa9at9\" data-start=\"2157\" data-end=\"2191\"\u003eHigh-performance racing hardware\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2193\" data-end=\"2240\"\u003eRonstan states the Orbit Block™ range provides:\u003c\/p\u003e\n\u003cul data-start=\"2241\" data-end=\"2310\"\u003e\n\u003cli data-section-id=\"jh22ux\" data-start=\"2241\" data-end=\"2262\"\u003e“Superior strength”\u003c\/li\u003e\n\u003cli data-section-id=\"1v0myb1\" data-start=\"2263\" data-end=\"2281\"\u003e“Reduced weight”\u003c\/li\u003e\n\u003cli data-section-id=\"12psmqz\" data-start=\"2282\" data-end=\"2310\"\u003e“Exceptional performance”\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2312\" data-end=\"2315\"\u003e\n\u003ch2 data-section-id=\"1fkmnjx\" data-start=\"2317\" data-end=\"2391\"\u003eWhy Buy the Ronstan RF28109 from \u003cspan class=\"\" data-state=\"closed\"\u003e\u003ca class=\"decorated-link\" rel=\"noopener\" href=\"https:\/\/bartonmarine.co.nz?utm_source=chatgpt.com\" target=\"_blank\"\u003eBarton Marine NZ\u003c\/a\u003e\u003c\/span\u003e?\u003c\/h2\u003e\n\u003cp data-start=\"2393\" data-end=\"2669\"\u003eAt \u003cspan class=\"\" data-state=\"closed\"\u003e\u003ca class=\"decorated-link\" rel=\"noopener\" href=\"https:\/\/bartonmarine.co.nz?utm_source=chatgpt.com\" target=\"_blank\"\u003eBarton Marine NZ\u003c\/a\u003e\u003c\/span\u003e we supply genuine Ronstan sailing hardware trusted by New Zealand sailors and racing enthusiasts. The RF28109 is an excellent low-friction pulley solution for modern lightweight rigging systems and high-performance sail control setups.\u003c\/p\u003e\n\u003cp data-start=\"2671\" data-end=\"2683\"\u003ePerfect for:\u003c\/p\u003e\n\u003cul data-start=\"2684\" data-end=\"2888\"\u003e\n\u003cli data-section-id=\"1wioaul\" data-start=\"2684\" data-end=\"2699\"\u003eDinghy racing\u003c\/li\u003e\n\u003cli data-section-id=\"t0l3qy\" data-start=\"2700\" data-end=\"2714\"\u003eSports boats\u003c\/li\u003e\n\u003cli data-section-id=\"1ogof4e\" data-start=\"2715\" data-end=\"2732\"\u003eTrailer sailers\u003c\/li\u003e\n\u003cli data-section-id=\"122dayi\" data-start=\"2733\" data-end=\"2752\"\u003eMainsheet systems\u003c\/li\u003e\n\u003cli data-section-id=\"c8141j\" data-start=\"2753\" data-end=\"2768\"\u003eVang cascades\u003c\/li\u003e\n\u003cli data-section-id=\"cp7k3y\" data-start=\"2769\" data-end=\"2790\"\u003eCunningham controls\u003c\/li\u003e\n\u003cli data-section-id=\"1w1nwk8\" data-start=\"2791\" data-end=\"2807\"\u003eBarber haulers\u003c\/li\u003e\n\u003cli data-section-id=\"1q4s59l\" data-start=\"2808\" data-end=\"2827\"\u003eSpinnaker systems\u003c\/li\u003e\n\u003cli data-section-id=\"bmvrv0\" data-start=\"2828\" data-end=\"2855\"\u003eLightweight control lines\u003c\/li\u003e\n\u003cli data-section-id=\"1rjtrkb\" data-start=\"2856\" data-end=\"2888\"\u003eHigh-performance sail trimming\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2890\" data-end=\"2893\"\u003e\n\u003ch2 data-section-id=\"1cgu054\" data-start=\"2895\" data-end=\"2922\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdiv class=\"TyagGW_tableContainer\"\u003e\n\u003cdiv class=\"group TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\"\u003e\n\u003ctable data-start=\"2924\" data-end=\"3290\" class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead data-start=\"2924\" data-end=\"2951\"\u003e\n\u003ctr data-start=\"2924\" data-end=\"2951\"\u003e\n\u003cth data-start=\"2924\" data-end=\"2934\" data-col-size=\"sm\" class=\"last:pe-10\"\u003eFeature\u003c\/th\u003e\n\u003cth data-start=\"2934\" data-end=\"2951\" data-col-size=\"sm\" class=\"last:pe-10\"\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"2962\" data-end=\"3290\"\u003e\n\u003ctr data-start=\"2962\" data-end=\"2981\"\u003e\n\u003ctd data-start=\"2962\" data-end=\"2970\" data-col-size=\"sm\"\u003eBrand\u003c\/td\u003e\n\u003ctd data-start=\"2970\" data-end=\"2981\" data-col-size=\"sm\"\u003eRonstan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2982\" data-end=\"3001\"\u003e\n\u003ctd data-start=\"2982\" data-end=\"2990\" data-col-size=\"sm\"\u003eModel\u003c\/td\u003e\n\u003ctd data-start=\"2990\" data-end=\"3001\" data-col-size=\"sm\"\u003eRF28109\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3002\" data-end=\"3052\"\u003e\n\u003ctd data-start=\"3002\" data-end=\"3017\" data-col-size=\"sm\"\u003eProduct Type\u003c\/td\u003e\n\u003ctd data-start=\"3017\" data-end=\"3052\" data-col-size=\"sm\"\u003eSingle Ball Bearing Orbit Block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3053\" data-end=\"3074\"\u003e\n\u003ctd data-start=\"3053\" data-end=\"3062\" data-col-size=\"sm\"\u003eSeries\u003c\/td\u003e\n\u003ctd data-start=\"3062\" data-end=\"3074\" data-col-size=\"sm\"\u003e25 Orbit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3075\" data-end=\"3101\"\u003e\n\u003ctd data-start=\"3075\" data-end=\"3093\" data-col-size=\"sm\"\u003eSheave Diameter\u003c\/td\u003e\n\u003ctd data-start=\"3093\" data-end=\"3101\" data-col-size=\"sm\"\u003e25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3102\" data-end=\"3133\"\u003e\n\u003ctd data-start=\"3102\" data-end=\"3126\" data-col-size=\"sm\"\u003eMaximum Rope Diameter\u003c\/td\u003e\n\u003ctd data-start=\"3126\" data-end=\"3133\" data-col-size=\"sm\"\u003e8mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3134\" data-end=\"3166\"\u003e\n\u003ctd data-start=\"3134\" data-end=\"3157\" data-col-size=\"sm\"\u003eMaximum Working Load\u003c\/td\u003e\n\u003ctd data-start=\"3157\" data-end=\"3166\" data-col-size=\"sm\"\u003e225kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3167\" data-end=\"3192\"\u003e\n\u003ctd data-start=\"3167\" data-end=\"3183\" data-col-size=\"sm\"\u003eBreaking Load\u003c\/td\u003e\n\u003ctd data-start=\"3183\" data-end=\"3192\" data-col-size=\"sm\"\u003e450kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3193\" data-end=\"3217\"\u003e\n\u003ctd data-start=\"3193\" data-end=\"3202\" data-col-size=\"sm\"\u003eWeight\u003c\/td\u003e\n\u003ctd data-start=\"3202\" data-end=\"3217\" data-col-size=\"sm\"\u003eApprox. 13g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3218\" data-end=\"3259\"\u003e\n\u003ctd data-start=\"3218\" data-end=\"3235\" data-col-size=\"sm\"\u003eBearing System\u003c\/td\u003e\n\u003ctd data-start=\"3235\" data-end=\"3259\" data-col-size=\"sm\"\u003e2-Stage Ball Bearing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3260\" data-end=\"3290\"\u003e\n\u003ctd data-start=\"3260\" data-end=\"3278\" data-col-size=\"sm\"\u003eAttachment Type\u003c\/td\u003e\n\u003ctd data-start=\"3278\" data-end=\"3290\" data-col-size=\"sm\"\u003eLoop Top\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp data-start=\"3292\" data-end=\"3320\"\u003eRonstan specifications list:\u003c\/p\u003e\n\u003cul data-start=\"3321\" data-end=\"3412\"\u003e\n\u003cli data-section-id=\"1mjdcep\" data-start=\"3321\" data-end=\"3345\"\u003eMax rope diameter: 8mm\u003c\/li\u003e\n\u003cli data-section-id=\"1ykdbul\" data-start=\"3346\" data-end=\"3360\"\u003eM.W.L: 225kg\u003c\/li\u003e\n\u003cli data-section-id=\"dnf6ie\" data-start=\"3361\" data-end=\"3383\"\u003eBreaking load: 450kg\u003c\/li\u003e\n\u003cli data-section-id=\"188zdxu\" data-start=\"3384\" data-end=\"3412\"\u003eWeight: approximately 13g\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3414\" data-end=\"3417\"\u003e\n\u003ch2 data-section-id=\"vx2wyp\" data-start=\"3419\" data-end=\"3441\"\u003eCommon Applications\u003c\/h2\u003e\n\u003cp data-start=\"3443\" data-end=\"3484\"\u003eThe Ronstan RF28109 is commonly used for:\u003c\/p\u003e\n\u003cul data-start=\"3485\" data-end=\"3745\"\u003e\n\u003cli data-section-id=\"jc0x8s\" data-start=\"3485\" data-end=\"3509\"\u003eDinghy control systems\u003c\/li\u003e\n\u003cli data-section-id=\"1hgy2vf\" data-start=\"3510\" data-end=\"3536\"\u003eMainsheet turning blocks\u003c\/li\u003e\n\u003cli data-section-id=\"fsls04\" data-start=\"3537\" data-end=\"3563\"\u003eSpinnaker sheet controls\u003c\/li\u003e\n\u003cli data-section-id=\"1nfxzav\" data-start=\"3564\" data-end=\"3588\"\u003eCascading vang systems\u003c\/li\u003e\n\u003cli data-section-id=\"cp7k3y\" data-start=\"3589\" data-end=\"3610\"\u003eCunningham controls\u003c\/li\u003e\n\u003cli data-section-id=\"xkrzff\" data-start=\"3611\" data-end=\"3640\"\u003eLightweight rigging systems\u003c\/li\u003e\n\u003cli data-section-id=\"1hup3ca\" data-start=\"3641\" data-end=\"3668\"\u003eSports boat sail controls\u003c\/li\u003e\n\u003cli data-section-id=\"c3ppre\" data-start=\"3669\" data-end=\"3704\"\u003eHigh-performance trimming systems\u003c\/li\u003e\n\u003cli data-section-id=\"1w1nwk8\" data-start=\"3705\" data-end=\"3721\"\u003eBarber haulers\u003c\/li\u003e\n\u003cli data-section-id=\"16bvwpo\" data-start=\"3722\" data-end=\"3745\"\u003eRacing yacht upgrades\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3747\" data-end=\"3794\"\u003eRonstan recommends Series 25 Orbit Blocks™ for:\u003c\/p\u003e\n\u003cul data-start=\"3795\" data-end=\"3896\"\u003e\n\u003cli data-section-id=\"k1o7oz\" data-start=\"3795\" data-end=\"3812\"\u003e“Control lines”\u003c\/li\u003e\n\u003cli data-section-id=\"wn3zv\" data-start=\"3813\" data-end=\"3834\"\u003e“Mainsheet systems”\u003c\/li\u003e\n\u003cli data-section-id=\"k3ttv7\" data-start=\"3835\" data-end=\"3854\"\u003e“Cascading vangs”\u003c\/li\u003e\n\u003cli data-section-id=\"69mv4e\" data-start=\"3855\" data-end=\"3896\"\u003e“High-performance dinghy applications”\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3898\" data-end=\"3901\"\u003e\n\u003ch2 data-section-id=\"ctfpuh\" data-start=\"3903\" data-end=\"3926\"\u003ePerformance Benefits\u003c\/h2\u003e\n\u003cp data-start=\"3928\" data-end=\"3957\"\u003eThe Ronstan RF28109 provides:\u003c\/p\u003e\n\u003cul data-start=\"3958\" data-end=\"4194\"\u003e\n\u003cli data-section-id=\"vhb287\" data-start=\"3958\" data-end=\"3999\"\u003eExtremely smooth low-friction operation\u003c\/li\u003e\n\u003cli data-section-id=\"1jwy9ry\" data-start=\"4000\" data-end=\"4032\"\u003eLightweight racing performance\u003c\/li\u003e\n\u003cli data-section-id=\"q06yxf\" data-start=\"4033\" data-end=\"4069\"\u003eExcellent strength-to-weight ratio\u003c\/li\u003e\n\u003cli data-section-id=\"9pith0\" data-start=\"4070\" data-end=\"4101\"\u003eReliable high-load durability\u003c\/li\u003e\n\u003cli data-section-id=\"hugb0u\" data-start=\"4102\" data-end=\"4135\"\u003eEfficient sail trimming control\u003c\/li\u003e\n\u003cli data-section-id=\"1czlsgn\" data-start=\"4136\" data-end=\"4160\"\u003eReduced rigging weight\u003c\/li\u003e\n\u003cli data-section-id=\"e2qokp\" data-start=\"4161\" data-end=\"4194\"\u003eLong-lasting marine reliability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"4196\" data-end=\"4349\"\u003eLoop-top Orbit Blocks™ are popular in racing applications because they reduce hardware weight while maintaining excellent load handling and flexibility.\u003c\/p\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":48439937990904,"sku":null,"price":23.9,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/0899\/0200\/files\/Ronstan_RF28109_25mm_Ball_Bearing_Pulley.jpg?v=1779253085","url":"https:\/\/bartonmarine.co.nz\/products\/ronstan-rf28109-25mm-single-pulley","provider":"Barton Marine","version":"1.0","type":"link"}