{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"802801e40d8b","name":"REAR SPROCKET STEEL 51 [JTR215.51] 420 MX-21551","sku":"SR209-51.S.DR","brand":"Dirt Racing","mpn":null,"gtin":null,"condition":"new","inStock":true,"stock":21,"price":{"amount":11.65,"formatted":"£11.65"},"summary":"REAR SPROCKET STEEL 51 [JTR215.51] 420 MX-21551. Made from C45 high-carbon steel, heat treated and sandblasted. Finished in powder-coated black or bright zinc plated (BZP). Meets or exceeds motorcycle industry compound quality standards. Direct OEM replacement. Tooth Count: 51, Chain Size: 420, Inner Diameter (I.D.): 110 mm, Pitch Circle Diameter (PCD): 130 mm, Mounting: 4 counter-sunk holes 8.5 mm. Finish: Silver. Part No.: SR209-51.S.DR. Cross-Reference OEM Part Numbers: JTR209.51, MX-21551, L17-0151, MX-215451, SR209-51.S.DR. Weight: 726g.","attributes":[{"label":"General Product Group","value":"Chain & Sprockets"},{"label":"General Product Type","value":"Sprockets & Components (Rear)"},{"label":"Variant Id","value":"277680"}],"image":"https://www.oro2u.com/media/catalog/product/s/t/stock76926_1.jpg","images":["https://www.oro2u.com/media/catalog/product/s/t/stock76926_1.jpg"],"description":"REAR SPROCKET STEEL 51 [JTR215.51] 420 MX-21551. Made from C45 high-carbon steel, heat treated and sandblasted. Finished in powder-coated black or bright zinc plated (BZP). Meets or exceeds motorcycle industry compound quality standards. Direct OEM replacement. Tooth Count: 51, Chain Size: 420, Inner Diameter (I.D.): 110 mm, Pitch Circle Diameter (PCD): 130 mm, Mounting: 4 counter-sunk holes 8.5 mm. Finish: Silver. Part No.: SR209-51.S.DR. Cross-Reference OEM Part Numbers: JTR209.51, MX-21551, L17-0151, MX-215451, SR209-51.S.DR. Weight: 726g.","descriptionMarkdown":"### Dirt Racing Rear Sprocket 51 Tooth 420 Chain\n\nEnhance your motorcycle's drivetrain with this durable rear sprocket from Dirt Racing. Engineered for performance and longevity, this sprocket is a direct replacement for your original part, ensuring a seamless fit and reliable operation.\n\n**Key Features:**\n\n \n- Constructed from high-quality C45 high-carbon steel for superior strength.\n \n- Heat treated and sandblasted to reduce surface tension and improve durability.\n \n- Finished with a powder-coated black or bright zinc plating (BZP) for corrosion resistance.\n \n- Meets or exceeds industry quality standards for motorcycle components.\n \n- Designed as a direct Original Equipment Manufacturer (OEM) replacement.\n\n**Specifications:**\n\n \n- Tooth Count: 51\n \n- Chain Size Compatibility: 420\n \n- Inner Diameter (I.D.): 110 mm\n \n- Pitch Circle Diameter (PCD): 130 mm\n \n- Mounting Type: 4 counter-sunk holes\n \n- Hole Diameter: 8.5 mm\n \n- Finish: Silver\n \n- Part Number: \n\n**Cross-Reference Part Numbers:**\n\n \n- JTR209.51\n \n- MX-21551\n \n- L17-0151\n \n- MX-215451\n \n-","weightGrams":null,"fitments":[{"make":"HONDA","model":"CR 80","cc":null,"notes":null,"years":"1985–2004"},{"make":"HONDA","model":"CR 85","cc":null,"notes":null,"years":"2003–2007"},{"make":"HONDA","model":"CR BW 80","cc":null,"notes":null,"years":"1986–2004"},{"make":"HONDA","model":"CR BW 85","cc":null,"notes":null,"years":"2006–2007"},{"make":"HONDA","model":"CRF 150R","cc":null,"notes":null,"years":"2007–2019"},{"make":"HONDA","model":"CRM 50","cc":null,"notes":null,"years":"1988–1992"},{"make":"HONDA","model":"CRM 80","cc":null,"notes":null,"years":"1988–1992"}],"collections":[{"name":"Chain & Sprockets","url":"https://www.2brosparts.com/api/agent/collection/GB/chain-sprockets"},{"name":"Sprockets & Components (Rear)","url":"https://www.2brosparts.com/api/agent/collection/GB/sprockets-components-rear"}],"links":{"page":"https://www.2brosparts.com/products/rear-sprocket-steel-51-jtr21551-420-mx-21551","buyOneNow":"https://www.2brosparts.com/api/agent/checkout/GB/802801e40d8b:1","basketWithThis":"https://www.2brosparts.com/api/agent/basket/GB/802801e40d8b:1"}},"market":{"country":"GB","countryName":"United Kingdom","locale":"en-gb","currency":"GBP","exchangeRateFromGbp":1,"pricesIncludeUkVat":true,"checkoutTax":null,"delivery":[{"name":"Standard","description":"Orders £15.00–£59.99 · 2–4 business days","carrier":null,"estimatedDays":"2–4 business days","price":{"amount":4.99,"formatted":"£4.99"},"free":false,"minimumOrder":{"amount":0,"formatted":"£0.00","gbp":0},"weightGrams":null},{"name":"Standard","description":"Orders £60.00 and up · 2–4 business days","carrier":null,"estimatedDays":"2–4 business days","price":{"amount":0,"formatted":"£0.00"},"free":true,"minimumOrder":{"amount":60,"formatted":"£60.00","gbp":60},"weightGrams":null}],"storeUrl":"https://www.2brosparts.com"},"navigate":{"start":"https://www.2brosparts.com/api/agent","search":"https://www.2brosparts.com/api/agent/search/GB/{words+joined+with+plus}"},"howToBuy":{"summary":"Build a basket for the shopper and give them one checkout link. Every URL is a plain path (no query string) and a GET. Nothing is stored between calls.","checkoutLinkFormat":"https://www.2brosparts.com/api/agent/checkout/GB/{basketKey}:{quantity},{basketKey}:{quantity}","steps":["1. Find products: follow links in these responses, or fetch https://www.2brosparts.com/api/agent/search/GB/{words+joined+with+plus} (e.g. https://www.2brosparts.com/api/agent/search/GB/brake+pads). Every product has a basketKey.","2. Optional check: https://www.2brosparts.com/api/agent/basket/GB/{basketKey}:{quantity},{basketKey}:{quantity} returns stock, totals per delivery option and the checkout link.","3. Give the shopper the checkout link. Opening it fills their basket with exactly these items (replacing what was there) and opens checkout for United Kingdom. They pay on 2brosparts.com through Stripe."],"noFetchNeeded":"You can write the checkout link yourself from basketKeys and quantities; nothing has to be fetched first. Each product also has links.buyOneNow, a ready link for one unit.","stateless":"Nothing is saved on our side. The items part of the URL is the whole basket: to change it, write the link again with the new list.","itemsFormat":"basketKey:quantity pairs joined by commas, e.g. 04f24aad4d68:2,7c1e9a0b3f2d:1. Quantity defaults to 1. Up to 50 products, 100 each.","country":"GB is the shopper's delivery country. Swap it for theirs (US, DE, FR…) in any URL; currency, tax and delivery follow it.","tips":["Put everything the shopper wants in one link.","Optionally add your name as a last path segment on checkout links (…/checkout/GB/<items>/claude) so the sale is credited to you.","The checkout link is for the shopper's browser. Do not open it yourself.","Signed-in trade account holders see their trade prices at checkout."]}}