{"product_id":"bravvos-crank-1pce-20-51-5mm-w-o-pin","title":"Bravvos Crank 1Pce 20 51.5Mm W\/O Pin","description":"\u003cdiv class=\"Y3BBE\" data-complete=\"true\" data-hveid=\"CAIQAA\" data-processed=\"true\" data-sfc-cb=\"\" data-sfc-cp=\"\" data-sfc-root=\"c\" jsaction=\"rcuQ6b:\u0026amp;SwWJ9_f|npT2md\" jscontroller=\"zcfIf\" jsuid=\"SwWJ9_f\" style='font-family: \"Google Sans\", Arial, sans-serif; font-size: 16px; line-height: 24px; overflow-wrap: break-word; margin-block: 12px 16px; margin-top: 12px; margin-bottom: 16px; padding-top: 0px; padding-bottom: 0px; color: rgb(10, 10, 10); background-color: rgb(255, 255, 255);'\u003e\r\n\u003ch2 data-end=\"151\" data-section-id=\"1b387ru\" data-start=\"134\"\u003e????️ What it is\u003c\/h2\u003e\r\n\r\n\u003cp data-end=\"244\" data-start=\"152\"\u003eThis is a \u003cstrong data-end=\"202\" data-start=\"162\"\u003eone-piece (Ashtabula-style) crankset\u003c\/strong\u003e designed for \u003cstrong data-end=\"233\" data-start=\"216\"\u003e20-inch bikes\u003c\/strong\u003e, commonly:\u003c\/p\u003e\r\n\r\n\u003cul data-end=\"293\" data-start=\"245\"\u003e\r\n\t\u003cli data-end=\"258\" data-section-id=\"idt6rt\" data-start=\"245\"\u003eBMX bikes\u003c\/li\u003e\r\n\t\u003cli data-end=\"274\" data-section-id=\"1x7cedu\" data-start=\"259\"\u003eKids’ bikes\u003c\/li\u003e\r\n\t\u003cli data-end=\"293\" data-section-id=\"lx49ew\" data-start=\"275\"\u003eBasic cruisers\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003cp data-end=\"411\" data-start=\"295\"\u003eThe crank, spindle, and arms are all forged as a \u003cstrong data-end=\"365\" data-start=\"344\"\u003esingle steel unit\u003c\/strong\u003e that rotates through a simple bottom bracket.\u003c\/p\u003e\r\n\r\n\u003chr data-end=\"416\" data-start=\"413\"\u003e\r\n\u003ch2 data-end=\"443\" data-section-id=\"1t694pa\" data-start=\"418\"\u003e???? Key specs explained\u003c\/h2\u003e\r\n\r\n\u003cp data-end=\"475\" data-start=\"445\"\u003e\u003cstrong data-end=\"475\" data-start=\"445\"\u003e???? 20” wheel compatibility\u003c\/strong\u003e\u003c\/p\u003e\r\n\r\n\u003cul data-end=\"600\" data-start=\"476\"\u003e\r\n\t\u003cli data-end=\"527\" data-section-id=\"bvuzbl\" data-start=\"476\"\u003eDesigned for \u003cstrong data-end=\"527\" data-start=\"491\"\u003elarger kids’ bikes or BMX frames\u003c\/strong\u003e\n\u003c\/li\u003e\r\n\t\u003cli data-end=\"600\" data-section-id=\"zepe9c\" data-start=\"528\"\u003eTypically paired with stronger, more stable frames than 16” versions\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003chr data-end=\"605\" data-start=\"602\"\u003e\r\n\u003cp data-end=\"642\" data-start=\"607\"\u003e\u003cstrong data-end=\"642\" data-start=\"607\"\u003e⚙️ 51.5 mm bottom bracket shell\u003c\/strong\u003e\u003c\/p\u003e\r\n\r\n\u003cul data-end=\"822\" data-start=\"643\"\u003e\r\n\t\u003cli data-end=\"699\" data-section-id=\"n5f4wc\" data-start=\"643\"\u003eThis is the \u003cstrong data-end=\"699\" data-start=\"657\"\u003estandard “US\/Ashtabula” OPC shell size\u003c\/strong\u003e\n\u003c\/li\u003e\r\n\t\u003cli data-end=\"733\" data-section-id=\"tf9kfk\" data-start=\"700\"\u003eLarger than the 43 mm version\u003c\/li\u003e\r\n\t\u003cli data-end=\"822\" data-section-id=\"awawic\" data-start=\"734\"\u003e❗ Must match your frame exactly—this is not interchangeable with smaller OPC systems\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003chr data-end=\"827\" data-start=\"824\"\u003e\r\n\u003cp data-end=\"858\" data-start=\"829\"\u003e\u003cstrong data-end=\"858\" data-start=\"829\"\u003e???? Crank length (~152 mm)\u003c\/strong\u003e\u003c\/p\u003e\r\n\r\n\u003cul data-end=\"1017\" data-start=\"859\"\u003e\r\n\t\u003cli data-end=\"902\" data-section-id=\"12c9ypo\" data-start=\"859\"\u003eLonger crank arms than kids’ 16” setups\u003c\/li\u003e\r\n\t\u003cli data-end=\"983\" data-section-id=\"npln48\" data-start=\"903\"\u003eGives:\r\n\t\u003cul data-end=\"983\" data-start=\"914\"\u003e\r\n\t\t\u003cli data-end=\"933\" data-section-id=\"i6i5yr\" data-start=\"914\"\u003eBetter leverage\u003c\/li\u003e\r\n\t\t\u003cli data-end=\"983\" data-section-id=\"27y57r\" data-start=\"936\"\u003eMore comfortable pedaling for taller riders\u003c\/li\u003e\r\n\t\u003c\/ul\u003e\r\n\t\u003c\/li\u003e\r\n\t\u003cli data-end=\"1017\" data-section-id=\"19wxoe8\" data-start=\"984\"\u003eCommon on 20” BMX-style bikes\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003chr data-end=\"1022\" data-start=\"1019\"\u003e\r\n\u003cp data-end=\"1062\" data-start=\"1024\"\u003e\u003cstrong data-end=\"1062\" data-start=\"1024\"\u003e???? W\/O pin (cotterless OPC design)\u003c\/strong\u003e\u003c\/p\u003e\r\n\r\n\u003cul data-end=\"1246\" data-start=\"1063\"\u003e\r\n\t\u003cli data-end=\"1110\" data-section-id=\"zxtkbw\" data-start=\"1063\"\u003eThis version does \u003cstrong data-end=\"1110\" data-start=\"1083\"\u003enot use a retaining pin\u003c\/strong\u003e\n\u003c\/li\u003e\r\n\t\u003cli data-end=\"1198\" data-section-id=\"15g6ndi\" data-start=\"1111\"\u003eInstead, stability comes from:\r\n\t\u003cul data-end=\"1198\" data-start=\"1146\"\u003e\r\n\t\t\u003cli data-end=\"1162\" data-section-id=\"1gjxhfr\" data-start=\"1146\"\u003eFrame design\u003c\/li\u003e\r\n\t\t\u003cli data-end=\"1198\" data-section-id=\"1hgc1d7\" data-start=\"1165\"\u003ePress-fit bottom bracket cups\u003c\/li\u003e\r\n\t\u003c\/ul\u003e\r\n\t\u003c\/li\u003e\r\n\t\u003cli data-end=\"1246\" data-section-id=\"y8q0rv\" data-start=\"1199\"\u003eSimpler, more modern version of OPC systems\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003chr data-end=\"1251\" data-start=\"1248\"\u003e\r\n\u003cp data-end=\"1298\" data-start=\"1253\"\u003e\u003cstrong data-end=\"1298\" data-start=\"1253\"\u003e???? Steel Ashtabula “S-shape” construction\u003c\/strong\u003e\u003c\/p\u003e\r\n\r\n\u003cul data-end=\"1451\" data-start=\"1299\"\u003e\r\n\t\u003cli data-end=\"1342\" data-section-id=\"7vrtec\" data-start=\"1299\"\u003eSingle forged steel piece (very strong)\u003c\/li\u003e\r\n\t\u003cli data-end=\"1387\" data-section-id=\"1uzrys3\" data-start=\"1343\"\u003eExtremely resistant to bending or impact\u003c\/li\u003e\r\n\t\u003cli data-end=\"1451\" data-section-id=\"14j3vqc\" data-start=\"1388\"\u003eHeavier than modern multi-piece cranksets, but very durable\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003chr data-end=\"1456\" data-start=\"1453\"\u003e\r\n\u003cp data-end=\"1484\" data-start=\"1458\"\u003e\u003cstrong data-end=\"1484\" data-start=\"1458\"\u003e???? Pedal compatibility\u003c\/strong\u003e\u003c\/p\u003e\r\n\r\n\u003cul data-end=\"1580\" data-start=\"1485\"\u003e\r\n\t\u003cli data-end=\"1534\" data-section-id=\"18yuhs4\" data-start=\"1485\"\u003eUses standard \u003cstrong data-end=\"1532\" data-start=\"1501\"\u003e1\/2” x 20 TPI pedal threads\u003c\/strong\u003e\n\u003c\/li\u003e\r\n\t\u003cli data-end=\"1580\" data-section-id=\"3sqvs8\" data-start=\"1535\"\u003eCommon on BMX and one-piece crank systems\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003chr data-end=\"1585\" data-start=\"1582\"\u003e\r\n\u003ch2 data-end=\"1611\" data-section-id=\"6dimzn\" data-start=\"1587\"\u003e???? Where it fits best\u003c\/h2\u003e\r\n\r\n\u003cp data-end=\"1673\" data-start=\"1612\"\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003eBravvos\u003c\/span\u003e targets this crank for:\u003c\/p\u003e\r\n\r\n\u003cul data-end=\"1813\" data-start=\"1674\"\u003e\r\n\t\u003cli data-end=\"1691\" data-section-id=\"mtvlh2\" data-start=\"1674\"\u003e20” BMX bikes\u003c\/li\u003e\r\n\t\u003cli data-end=\"1725\" data-section-id=\"19tw5f4\" data-start=\"1692\"\u003eOlder or entry-level cruisers\u003c\/li\u003e\r\n\t\u003cli data-end=\"1777\" data-section-id=\"hwe6jw\" data-start=\"1726\"\u003eKids’ bikes transitioning to larger wheel sizes\u003c\/li\u003e\r\n\t\u003cli data-end=\"1813\" data-section-id=\"1siis9x\" data-start=\"1778\"\u003eBudget repairs and replacements\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003chr data-end=\"1818\" data-start=\"1815\"\u003e\r\n\u003ch2 data-end=\"1861\" data-section-id=\"ad00g7\" data-start=\"1820\"\u003e⚠️ Compatibility checklist (important)\u003c\/h2\u003e\r\n\r\n\u003cp data-end=\"1885\" data-start=\"1862\"\u003eBefore buying, confirm:\u003c\/p\u003e\r\n\r\n\u003cul data-end=\"2130\" data-start=\"1887\"\u003e\r\n\t\u003cli data-end=\"1946\" data-section-id=\"jkhz1f\" data-start=\"1887\"\u003e✔ Your bike uses a \u003cstrong data-end=\"1944\" data-start=\"1908\"\u003e51.5 mm OPC bottom bracket shell\u003c\/strong\u003e\n\u003c\/li\u003e\r\n\t\u003cli data-end=\"2039\" data-section-id=\"3rd18x\" data-start=\"1947\"\u003e✔ Your frame is designed for \u003cstrong data-end=\"2037\" data-start=\"1978\"\u003eone-piece crank systems (not square taper or cartridge)\u003c\/strong\u003e\n\u003c\/li\u003e\r\n\t\u003cli data-end=\"2087\" data-section-id=\"1e4zgxm\" data-start=\"2040\"\u003e✔ You do NOT require a retaining pin system\u003c\/li\u003e\r\n\t\u003cli data-end=\"2130\" data-section-id=\"1kqvmpx\" data-start=\"2088\"\u003e✔ Chainline matches your current setup\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003chr data-end=\"2135\" data-start=\"2132\"\u003e\r\n\u003ch2 data-end=\"2154\" data-section-id=\"pmvb6c\" data-start=\"2137\"\u003e???? Bottom line\u003c\/h2\u003e\r\n\r\n\u003cp data-end=\"2405\" data-start=\"2155\"\u003eThis Bravvos 20” 51.5 mm crank is a \u003cstrong data-end=\"2243\" data-start=\"2191\"\u003estrong, simple, no-frills drivetrain replacement\u003c\/strong\u003e for BMX and kids’ bikes. It’s built for durability and abuse rather than performance or weight savings—but it works reliably when matched correctly to the frame.\u003c\/p\u003e\r\n\u003c\/div\u003e\r\n","brand":"Bravvos","offers":[{"title":"Default Title","offer_id":48133725847774,"sku":"CRA010","price":85.0,"currency_code":"ZAR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1242\/8790\/files\/23036_BSC-Products-8-1-1-4.png?v=1776692982","url":"https:\/\/online-bicycle-shop.co.za\/products\/bravvos-crank-1pce-20-51-5mm-w-o-pin","provider":"Online Bicycle Shop","version":"1.0","type":"link"}