{"about":"Prices are for United Kingdom in GBP. Every URL here is a plain path you can fetch directly.","product":{"basketKey":"c2a4579760ad","name":"REAR SPROCKET STEEL 39 [JTR301/210.39] 520, DOUBLE DRILLED JTR301, JTR210, L17-0239, MX-80339","sku":"SR301-39.S.DR","brand":"Dirt Racing","mpn":null,"gtin":null,"condition":"new","inStock":true,"stock":24,"price":{"amount":13.93,"formatted":"£13.93"},"summary":"This REAR SPROCKET STEEL 39-tooth sprocket is for a 520 chain size. It features dual-fitment mounting holes with countersunk 8.5 mm and plain 10.5 mm options. Constructed from C45 high-carbon steel, it is heat-treated and sandblasted. The sprocket is finished in black powder coat or silver zinc plating for durability and corrosion resistance. It meets or exceeds motorcycle industry compound standards and is a direct OEM replacement. Part Number: SR301-39.S.DR.","attributes":[{"label":"General Product Group","value":"Chain & Sprockets"},{"label":"General Product Type","value":"Sprockets & Components (Rear)"},{"label":"Variant Id","value":"278153"}],"image":"https://www.oro2u.com/media/catalog/product/s/t/stock77399_1.jpg","images":["https://www.oro2u.com/media/catalog/product/s/t/stock77399_1.jpg","https://www.oro2u.com/media/catalog/product/s/t/stock77399_2.jpg"],"description":"This REAR SPROCKET STEEL 39-tooth sprocket is for a 520 chain size. It features dual-fitment mounting holes with countersunk 8.5 mm and plain 10.5 mm options. Constructed from C45 high-carbon steel, it is heat-treated and sandblasted. The sprocket is finished in black powder coat or silver zinc plating for durability and corrosion resistance. It meets or exceeds motorcycle industry compound standards and is a direct OEM replacement. Part Number: SR301-39.S.DR.","descriptionMarkdown":"### Dirt Racing Rear Drive Sprocket \n\n This high-quality rear drive sprocket is designed for optimal performance and durability.\n Constructed from C45 high-carbon steel, it undergoes a heat-treatment and sandblasting process to\n reduce surface tension, ensuring longevity. The sprocket features a dual-fitment mounting\n pattern, accommodating both countersunk (8.5 mm) and plain (10.5 mm) bolt types, and is\n available in either a protective black powder coat or a bright zinc plating finish for\n corrosion resistance. It meets or exceeds motorcycle industry compound standards and serves\n as a direct OEM replacement part.\n\n#### Key Features:\n\n \n- Material: Crafted from C45 high-carbon steel for superior strength.\n \n- Durability: Heat-treated and sandblasted for enhanced toughness and reduced surface tension.\n \n- Versatile Mounting: Features a dual bolt pattern with both countersunk (8.5 mm) and plain (10.5 mm) options.\n \n- Protective Finish: Available in black powder-coated or silver bright zinc plating for excellent corrosion resistance.\n \n- Industry Standards: Meets or exceeds motorcycle industry compound standards.\n \n- Direct Replacement: Designed as a direct OEM replacement for a seamless fit.\n\n#### Specifications:\n\n \n- Tooth Count: 39\n \n- Chain Size Compatibility: 520\n \n- Mounting Type: Dual fitment (CSK 8.5 mm and CTB 10.5 mm)\n\n#### Cross-Reference Part Numbers:\n\n \n- JTR301.39\n \n- JTR210.39","weightGrams":null,"fitments":[{"make":"HONDA","model":"CRF L 250","cc":null,"notes":null,"years":"2013–2016"},{"make":"HONDA","model":"XR 250","cc":null,"notes":null,"years":"1996–2004"},{"make":"HONDA","model":"XR 400","cc":null,"notes":null,"years":"1996–2005"}],"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-39-jtr30121039-520-double-drilled-jtr301-jtr210-l17-0239-mx-","buyOneNow":"https://www.2brosparts.com/api/agent/checkout/GB/c2a4579760ad:1","basketWithThis":"https://www.2brosparts.com/api/agent/basket/GB/c2a4579760ad: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."]}}