{"product_id":"ronstan-rf28100-25mm-single-pulley","title":"Ronstan RF28100 Series 25 Orbit Ball Bearing Single Pulley","description":"\u003cp data-start=\"257\" data-end=\"777\"\u003eThe Ronstan RF28100 Series 25 Orbit Ball Bearing Single Pulley is a lightweight, high-performance sailing block engineered for dinghies, skiffs, sports boats, and high-load control systems operating in demanding New Zealand sailing conditions. Designed as part of Ronstan’s renowned Orbit Block™ range, the RF28100 combines exceptional strength, ultra-low friction, and minimal weight to deliver reliable performance for competitive sailors and performance-oriented rigging systems. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"779\" data-end=\"1310\"\u003eFeaturing a compact 25mm acetal ball bearing sheave with a swivel shackle head and integrated becket hub, the RF28100 provides smooth line handling and efficient load transfer in high-speed sail control applications. The advanced 2-stage ball bearing system minimises friction under both dynamic and static loads, improving trimming responsiveness and sail handling efficiency. Ronstan specifically designed the Series 25 Orbit range to achieve “the highest possible strength-to-weight ratio.” \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1312\" data-end=\"1686\"\u003eThe toughened glass fibre reinforced nylon cheeks provide excellent impact resistance and durability while keeping overall block weight extremely low. Its hollow hub design allows becket take-off functionality and versatile rigging configurations, making the RF28100 ideal for mainsheet systems, vang cascades, cunninghams, control lines, and spinnaker sheet turning blocks.\u003c\/p\u003e\n\u003cp data-start=\"1688\" data-end=\"1860\"\u003eSuitable for dinghies up to 4 metres (13ft), the Ronstan RF28100 is trusted by racing sailors worldwide for smooth low-friction performance and long-term marine durability.\u003c\/p\u003e\n\u003chr data-start=\"1862\" data-end=\"1865\"\u003e\n\u003ch2 data-section-id=\"1ma7m6t\" data-start=\"1867\" data-end=\"1882\"\u003eKey Features\u003c\/h2\u003e\n\u003cul data-start=\"1884\" data-end=\"2319\"\u003e\n\u003cli data-section-id=\"1a7hvzg\" data-start=\"1884\" data-end=\"1921\"\u003eGenuine Ronstan RF28100 Orbit Block\u003c\/li\u003e\n\u003cli data-section-id=\"1kedw8i\" data-start=\"1922\" data-end=\"1961\"\u003e25mm single ball bearing pulley block\u003c\/li\u003e\n\u003cli data-section-id=\"10uo58b\" data-start=\"1962\" data-end=\"1990\"\u003eSwivel shackle head design\u003c\/li\u003e\n\u003cli data-section-id=\"1imisqm\" data-start=\"1991\" data-end=\"2014\"\u003eIntegrated becket hub\u003c\/li\u003e\n\u003cli data-section-id=\"9x5tz3\" data-start=\"2015\" data-end=\"2053\"\u003eAdvanced 2-stage ball bearing system\u003c\/li\u003e\n\u003cli data-section-id=\"18y7cgd\" data-start=\"2054\" data-end=\"2094\"\u003eLightweight high-strength construction\u003c\/li\u003e\n\u003cli data-section-id=\"1q6u4nv\" data-start=\"2095\" data-end=\"2134\"\u003eLow-friction sail control performance\u003c\/li\u003e\n\u003cli data-section-id=\"u5zctv\" data-start=\"2135\" data-end=\"2182\"\u003eToughened glass fibre reinforced nylon cheeks\u003c\/li\u003e\n\u003cli data-section-id=\"198zt65\" data-start=\"2183\" data-end=\"2211\"\u003eAcetal ball bearing sheave\u003c\/li\u003e\n\u003cli data-section-id=\"1tp7c8f\" data-start=\"2212\" data-end=\"2246\"\u003eHollow hub for versatile rigging\u003c\/li\u003e\n\u003cli data-section-id=\"11tp0b0\" data-start=\"2247\" data-end=\"2276\"\u003eSuitable for up to 8mm rope\u003c\/li\u003e\n\u003cli data-section-id=\"88xpku\" data-start=\"2277\" data-end=\"2319\"\u003eIdeal for dinghy and sports boat sailing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2321\" data-end=\"2357\"\u003eRonstan states the RF28100 features:\u003c\/p\u003e\n\u003cul data-start=\"2358\" data-end=\"2464\"\u003e\n\u003cli data-section-id=\"jh22ux\" data-start=\"2358\" data-end=\"2379\"\u003e“Superior strength”\u003c\/li\u003e\n\u003cli data-section-id=\"1v0myb1\" data-start=\"2380\" data-end=\"2398\"\u003e“Reduced weight”\u003c\/li\u003e\n\u003cli data-section-id=\"1p6c6uu\" data-start=\"2399\" data-end=\"2464\"\u003e“Exceptional performance” \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2466\" data-end=\"2469\"\u003e\n\u003ch2 data-section-id=\"70qc\" data-start=\"2471\" data-end=\"2545\"\u003eWhy Buy the Ronstan RF28100 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=\"2547\" data-end=\"2827\"\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, racers, and marine professionals. The RF28100 is an ideal low-friction pulley solution for high-performance dinghy rigging, sports boats, and sail control upgrades.\u003c\/p\u003e\n\u003cp data-start=\"2829\" data-end=\"2841\"\u003ePerfect for:\u003c\/p\u003e\n\u003cul data-start=\"2842\" data-end=\"3068\"\u003e\n\u003cli data-section-id=\"1wioaul\" data-start=\"2842\" data-end=\"2857\"\u003eDinghy racing\u003c\/li\u003e\n\u003cli data-section-id=\"t0l3qy\" data-start=\"2858\" data-end=\"2872\"\u003eSports boats\u003c\/li\u003e\n\u003cli data-section-id=\"mcxkkn\" data-start=\"2873\" data-end=\"2901\"\u003eSkiffs and trailer sailers\u003c\/li\u003e\n\u003cli data-section-id=\"122dayi\" data-start=\"2902\" data-end=\"2921\"\u003eMainsheet systems\u003c\/li\u003e\n\u003cli data-section-id=\"c8141j\" data-start=\"2922\" data-end=\"2937\"\u003eVang cascades\u003c\/li\u003e\n\u003cli data-section-id=\"1tiulzg\" data-start=\"2938\" data-end=\"2958\"\u003eCunningham systems\u003c\/li\u003e\n\u003cli data-section-id=\"1trc27r\" data-start=\"2959\" data-end=\"2991\"\u003eSpinnaker sheet turning blocks\u003c\/li\u003e\n\u003cli data-section-id=\"15ryhjp\" data-start=\"2992\" data-end=\"3013\"\u003eLeech line controls\u003c\/li\u003e\n\u003cli data-section-id=\"3swirq\" data-start=\"3014\" data-end=\"3037\"\u003eSail trimming systems\u003c\/li\u003e\n\u003cli data-section-id=\"1p46u4u\" data-start=\"3038\" data-end=\"3068\"\u003eLightweight rigging upgrades\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3070\" data-end=\"3073\"\u003e\n\u003ch2 data-section-id=\"1cgu054\" data-start=\"3075\" data-end=\"3102\"\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=\"3104\" data-end=\"3479\" class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead data-start=\"3104\" data-end=\"3131\"\u003e\n\u003ctr data-start=\"3104\" data-end=\"3131\"\u003e\n\u003cth data-start=\"3104\" data-end=\"3114\" data-col-size=\"sm\" class=\"last:pe-10\"\u003eFeature\u003c\/th\u003e\n\u003cth data-start=\"3114\" data-end=\"3131\" data-col-size=\"sm\" class=\"last:pe-10\"\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"3142\" data-end=\"3479\"\u003e\n\u003ctr data-start=\"3142\" data-end=\"3161\"\u003e\n\u003ctd data-start=\"3142\" data-end=\"3150\" data-col-size=\"sm\"\u003eBrand\u003c\/td\u003e\n\u003ctd data-start=\"3150\" data-end=\"3161\" data-col-size=\"sm\"\u003eRonstan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3162\" data-end=\"3181\"\u003e\n\u003ctd data-start=\"3162\" data-end=\"3170\" data-col-size=\"sm\"\u003eModel\u003c\/td\u003e\n\u003ctd data-start=\"3170\" data-end=\"3181\" data-col-size=\"sm\"\u003eRF28100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3182\" data-end=\"3232\"\u003e\n\u003ctd data-start=\"3182\" data-end=\"3197\" data-col-size=\"sm\"\u003eProduct Type\u003c\/td\u003e\n\u003ctd data-start=\"3197\" data-end=\"3232\" data-col-size=\"sm\"\u003eSingle Ball Bearing Orbit Block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3233\" data-end=\"3254\"\u003e\n\u003ctd data-start=\"3233\" data-end=\"3242\" data-col-size=\"sm\"\u003eSeries\u003c\/td\u003e\n\u003ctd data-start=\"3242\" data-end=\"3254\" data-col-size=\"sm\"\u003e25 Orbit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3255\" data-end=\"3281\"\u003e\n\u003ctd data-start=\"3255\" data-end=\"3273\" data-col-size=\"sm\"\u003eSheave Diameter\u003c\/td\u003e\n\u003ctd data-start=\"3273\" data-end=\"3281\" data-col-size=\"sm\"\u003e25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3282\" data-end=\"3313\"\u003e\n\u003ctd data-start=\"3282\" data-end=\"3306\" data-col-size=\"sm\"\u003eMaximum Rope Diameter\u003c\/td\u003e\n\u003ctd data-start=\"3306\" data-end=\"3313\" data-col-size=\"sm\"\u003e8mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3314\" data-end=\"3346\"\u003e\n\u003ctd data-start=\"3314\" data-end=\"3337\" data-col-size=\"sm\"\u003eMaximum Working Load\u003c\/td\u003e\n\u003ctd data-start=\"3337\" data-end=\"3346\" data-col-size=\"sm\"\u003e225kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3347\" data-end=\"3372\"\u003e\n\u003ctd data-start=\"3347\" data-end=\"3363\" data-col-size=\"sm\"\u003eBreaking Load\u003c\/td\u003e\n\u003ctd data-start=\"3363\" data-end=\"3372\" data-col-size=\"sm\"\u003e450kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3373\" data-end=\"3389\"\u003e\n\u003ctd data-start=\"3373\" data-end=\"3382\" data-col-size=\"sm\"\u003eWeight\u003c\/td\u003e\n\u003ctd data-start=\"3382\" data-end=\"3389\" data-col-size=\"sm\"\u003e18g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3390\" data-end=\"3431\"\u003e\n\u003ctd data-start=\"3390\" data-end=\"3407\" data-col-size=\"sm\"\u003eBearing System\u003c\/td\u003e\n\u003ctd data-start=\"3407\" data-end=\"3431\" data-col-size=\"sm\"\u003e2-Stage Ball Bearing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3432\" data-end=\"3462\"\u003e\n\u003ctd data-start=\"3432\" data-end=\"3444\" data-col-size=\"sm\"\u003eHead Type\u003c\/td\u003e\n\u003ctd data-start=\"3444\" data-end=\"3462\" data-col-size=\"sm\"\u003eSwivel Shackle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3463\" data-end=\"3479\"\u003e\n\u003ctd data-start=\"3463\" data-end=\"3472\" data-col-size=\"sm\"\u003eBecket\u003c\/td\u003e\n\u003ctd data-start=\"3472\" data-end=\"3479\" data-col-size=\"sm\"\u003eYes\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=\"3481\" data-end=\"3509\"\u003eRonstan specifications list:\u003c\/p\u003e\n\u003cul data-start=\"3510\" data-end=\"3628\"\u003e\n\u003cli data-section-id=\"qtpknh\" data-start=\"3510\" data-end=\"3538\"\u003eMaximum rope diameter: 8mm\u003c\/li\u003e\n\u003cli data-section-id=\"1ykdbul\" data-start=\"3539\" data-end=\"3553\"\u003eM.W.L: 225kg\u003c\/li\u003e\n\u003cli data-section-id=\"dnf6ie\" data-start=\"3554\" data-end=\"3576\"\u003eBreaking load: 450kg\u003c\/li\u003e\n\u003cli data-section-id=\"1cg79d\" data-start=\"3577\" data-end=\"3628\"\u003eWeight: 18g \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3630\" data-end=\"3633\"\u003e\n\u003ch2 data-section-id=\"vx2wyp\" data-start=\"3635\" data-end=\"3657\"\u003eCommon Applications\u003c\/h2\u003e\n\u003cp data-start=\"3659\" data-end=\"3700\"\u003eThe Ronstan RF28100 is commonly used for:\u003c\/p\u003e\n\u003cul data-start=\"3701\" data-end=\"3963\"\u003e\n\u003cli data-section-id=\"1hgy2vf\" data-start=\"3701\" data-end=\"3727\"\u003eMainsheet turning blocks\u003c\/li\u003e\n\u003cli data-section-id=\"9iy96u\" data-start=\"3728\" data-end=\"3753\"\u003eSpinnaker sheet systems\u003c\/li\u003e\n\u003cli data-section-id=\"cp7k3y\" data-start=\"3754\" data-end=\"3775\"\u003eCunningham controls\u003c\/li\u003e\n\u003cli data-section-id=\"1nfxzav\" data-start=\"3776\" data-end=\"3800\"\u003eCascading vang systems\u003c\/li\u003e\n\u003cli data-section-id=\"179o4e\" data-start=\"3801\" data-end=\"3823\"\u003eDinghy sail controls\u003c\/li\u003e\n\u003cli data-section-id=\"23f4mq\" data-start=\"3824\" data-end=\"3845\"\u003eSports boat rigging\u003c\/li\u003e\n\u003cli data-section-id=\"v2gd2w\" data-start=\"3846\" data-end=\"3881\"\u003eLightweight sail handling systems\u003c\/li\u003e\n\u003cli data-section-id=\"15ryhjp\" data-start=\"3882\" data-end=\"3903\"\u003eLeech line controls\u003c\/li\u003e\n\u003cli data-section-id=\"16bvwpo\" data-start=\"3904\" data-end=\"3927\"\u003eRacing yacht upgrades\u003c\/li\u003e\n\u003cli data-section-id=\"c3ppre\" data-start=\"3928\" data-end=\"3963\"\u003eHigh-performance trimming systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3965\" data-end=\"4000\"\u003eRonstan recommends the RF28100 for:\u003c\/p\u003e\n\u003cul data-start=\"4001\" data-end=\"4155\"\u003e\n\u003cli data-section-id=\"1i2xv4p\" data-start=\"4001\" data-end=\"4049\"\u003e“Mainsheet and spinnaker sheet turning blocks”\u003c\/li\u003e\n\u003cli data-section-id=\"k1o7oz\" data-start=\"4050\" data-end=\"4067\"\u003e“Control lines”\u003c\/li\u003e\n\u003cli data-section-id=\"k3ttv7\" data-start=\"4068\" data-end=\"4087\"\u003e“Cascading vangs”\u003c\/li\u003e\n\u003cli data-section-id=\"1l8prnt\" data-start=\"4088\" data-end=\"4155\"\u003e“Leech lines \u0026amp; cunninghams” \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4157\" data-end=\"4160\"\u003e\n\u003ch2 data-section-id=\"ctfpuh\" data-start=\"4162\" data-end=\"4185\"\u003ePerformance Benefits\u003c\/h2\u003e\n\u003cp data-start=\"4187\" data-end=\"4216\"\u003eThe Ronstan RF28100 provides:\u003c\/p\u003e\n\u003cul data-start=\"4217\" data-end=\"4456\"\u003e\n\u003cli data-section-id=\"dkuh1h\" data-start=\"4217\" data-end=\"4251\"\u003eExtremely low-friction operation\u003c\/li\u003e\n\u003cli data-section-id=\"1jwy9ry\" data-start=\"4252\" data-end=\"4284\"\u003eLightweight racing performance\u003c\/li\u003e\n\u003cli data-section-id=\"1rxe29x\" data-start=\"4285\" data-end=\"4318\"\u003eSmooth line handling under load\u003c\/li\u003e\n\u003cli data-section-id=\"q06yxf\" data-start=\"4319\" data-end=\"4355\"\u003eExcellent strength-to-weight ratio\u003c\/li\u003e\n\u003cli data-section-id=\"9pith0\" data-start=\"4356\" data-end=\"4387\"\u003eReliable high-load durability\u003c\/li\u003e\n\u003cli data-section-id=\"1nzek54\" data-start=\"4388\" data-end=\"4422\"\u003eImproved sail trimming precision\u003c\/li\u003e\n\u003cli data-section-id=\"e2qokp\" data-start=\"4423\" data-end=\"4456\"\u003eLong-lasting marine reliability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"4458\" data-end=\"4595\"\u003eRonstan’s Orbit Block™ systems are engineered for “high-demand dinghy and small boat applications.”\u003c\/p\u003e","brand":"Ronstan","offers":[{"title":"Default Title","offer_id":48439134355704,"sku":null,"price":39.9,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/0899\/0200\/files\/Ronstan_RF28100_25mm_Ball_Bearing_Pulley.jpg?v=1779252873","url":"https:\/\/bartonmarine.co.nz\/products\/ronstan-rf28100-25mm-single-pulley","provider":"Barton Marine","version":"1.0","type":"link"}