{"product_id":"zero-headset-bearing-30-15x41x6-5mm-45-45-r408","title":"Zero Headset Bearing 30.15x41x6.5MM 45\/45 R408","description":"\u003ch2 data-end=\"214\" data-section-id=\"1wo3vai\" data-start=\"185\"\u003e What those numbers mean\u003c\/h2\u003e\r\n\r\n\u003cul data-end=\"474\" data-start=\"215\"\u003e\r\n\t\u003cli data-end=\"267\" data-section-id=\"1gfq5y0\" data-start=\"215\"\u003e\n\u003cstrong data-end=\"234\" data-start=\"217\"\u003e30.15 mm (ID)\u003c\/strong\u003e → fits a \u003cstrong data-end=\"267\" data-start=\"244\"\u003e1 1\/8” steerer tube\u003c\/strong\u003e\n\u003c\/li\u003e\r\n\t\u003cli data-end=\"339\" data-section-id=\"1d9407g\" data-start=\"268\"\u003e\n\u003cstrong data-end=\"284\" data-start=\"270\"\u003e41 mm (OD)\u003c\/strong\u003e → fits the frame’s bearing seat (common IS41 standard)\u003c\/li\u003e\r\n\t\u003cli data-end=\"403\" data-section-id=\"1f9p23\" data-start=\"340\"\u003e\n\u003cstrong data-end=\"359\" data-start=\"342\"\u003e6.5 mm height\u003c\/strong\u003e → stack height—important for proper preload\u003c\/li\u003e\r\n\t\u003cli data-end=\"474\" data-section-id=\"b6vt1s\" data-start=\"404\"\u003e\n\u003cstrong data-end=\"426\" data-start=\"406\"\u003e45° \/ 45° angles\u003c\/strong\u003e → angular contact surfaces (must match exactly)\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003cp data-end=\"652\" data-start=\"476\"\u003eThis is typically referred to as an \u003cstrong data-end=\"537\" data-start=\"512\"\u003eR408 \/ MH-P03 bearing\u003c\/strong\u003e, one of the most common sizes for integrated headsets on road and MTB bikes.\u003c\/p\u003e\r\n\r\n\u003ch2 data-end=\"696\" data-section-id=\"1gllshg\" data-start=\"654\"\u003e Compatibility tips (don’t skip this)\u003c\/h2\u003e\r\n\r\n\u003cul data-end=\"1017\" data-start=\"697\"\u003e\r\n\t\u003cli data-end=\"829\" data-section-id=\"1uco5zm\" data-start=\"697\"\u003e\n\u003cstrong data-end=\"742\" data-start=\"699\"\u003e41 mm vs 41.8 mm is NOT interchangeable\u003c\/strong\u003e\u003cbr data-end=\"745\" data-start=\"742\"\u003e\r\n\tEven a 0.8 mm difference won’t fit properly.\u003c\/li\u003e\r\n\t\u003cli data-end=\"919\" data-section-id=\"1vxk3mf\" data-start=\"830\"\u003e\n\u003cstrong data-end=\"862\" data-start=\"832\"\u003e45°\/45° vs 36°\/45° matters\u003c\/strong\u003e\u003cbr data-end=\"865\" data-start=\"862\"\u003e\r\n\tWrong angle = poor seating, creaking, premature wear\u003c\/li\u003e\r\n\t\u003cli data-end=\"1017\" data-section-id=\"rggt5l\" data-start=\"920\"\u003e\n\u003cstrong data-end=\"949\" data-start=\"922\"\u003e6.5 mm vs 7–8 mm height\u003c\/strong\u003e\u003cbr data-end=\"952\" data-start=\"949\"\u003e\r\n\tSmall differences can affect headset preload and fork\/frame gap\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003ch2 data-end=\"1077\" data-section-id=\"epevdr\" data-start=\"1019\"\u003e Alternatives with same spec (if you can’t find ZERO)\u003c\/h2\u003e\r\n\r\n\u003cp data-end=\"1142\" data-start=\"1078\"\u003eHere are equivalent R408-type bearings with the same dimensions:\u003c\/p\u003e\r\n\r\n\u003cul data-end=\"1348\" data-start=\"1144\"\u003e\r\n\t\u003cli data-end=\"1212\" data-section-id=\"4m4qrw\" data-start=\"1144\"\u003e\n\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\" role=\"button\" tabindex=\"0\"\u003eKCNC Headset Bearing R408 41x30.1x6.5mm\u003c\/span\u003e – lightweight alloy option\u003c\/li\u003e\r\n\t\u003cli data-end=\"1272\" data-section-id=\"mkjlop\" data-start=\"1213\"\u003e\n\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\" role=\"button\" tabindex=\"0\"\u003eVeyga Headset Bearing P03\/R408 41x30x6.5mm\u003c\/span\u003e – budget-friendly\u003c\/li\u003e\r\n\t\u003cli data-end=\"1348\" data-section-id=\"hszwc7\" data-start=\"1273\"\u003e\n\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\" role=\"button\" tabindex=\"0\"\u003eGurpil 41x30.15x6.5mm 45\/45 Bearing\u003c\/span\u003e – stainless option for durability\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003cp data-end=\"1446\" data-start=\"1350\"\u003eThey’re all functionally interchangeable \u003cstrong data-end=\"1445\" data-start=\"1391\"\u003eas long as the dimensions and angles match exactly\u003c\/strong\u003e.\u003c\/p\u003e\r\n\r\n\u003chr data-end=\"1451\" data-start=\"1448\"\u003e\r\n\u003ch2 data-end=\"1492\" data-section-id=\"6qc6vv\" data-start=\"1453\"\u003e Quick sanity check before buying\u003c\/h2\u003e\r\n\r\n\u003cp data-end=\"1557\" data-start=\"1493\"\u003eIf you still have the old bearing, look for laser markings like:\u003c\/p\u003e\r\n\r\n\u003cpre class=\"overflow-visible! px-0!\" data-end=\"1592\" data-start=\"1558\"\u003e\r\n\r\n \u003c\/pre\u003e\r\n\r\n\u003cdiv class=\"relative w-full mt-4 mb-1\"\u003e\r\n\u003cdiv\u003e\r\n\u003cdiv class=\"relative\"\u003e\r\n\u003cdiv class=\"h-full min-h-0 min-w-0\"\u003e\r\n\u003cdiv class=\"h-full min-h-0 min-w-0\"\u003e\r\n\u003cdiv class=\"border border-token-border-light border-radius-3xl corner-superellipse\/1.1 rounded-3xl\"\u003e\r\n\u003cdiv class=\"h-full w-full border-radius-3xl bg-token-bg-elevated-secondary corner-superellipse\/1.1 overflow-clip rounded-3xl lxnfua_clipPathFallback\"\u003e\r\n\u003cdiv class=\"pointer-events-none absolute end-1.5 top-1 z-2 md:end-2 md:top-1\"\u003e \u003c\/div\u003e\r\n\r\n\u003cdiv class=\"relative\"\u003e\r\n\u003cdiv class=\"pe-11 pt-3\"\u003e\r\n\u003cdiv class=\"relative z-0 flex max-w-full\"\u003e\r\n\u003cdiv class=\"q9tKkq_viewer cm-editor z-10 light:cm-light dark:cm-light flex h-full w-full flex-col items-stretch ͼ5 ͼj\" dir=\"ltr\" id=\"code-block-viewer\"\u003e\r\n\u003cdiv class=\"cm-scroller\"\u003e\r\n\u003cdiv class=\"cm-content q9tKkq_readonly\"\u003e30.15 x 41 x 6.5 45°\/45°\u003c\/div\u003e\r\n\r\n\u003cdiv class=\"cm-content q9tKkq_readonly\"\u003e \u003c\/div\u003e\r\n\u003c\/div\u003e\r\n\u003c\/div\u003e\r\n\u003c\/div\u003e\r\n\u003c\/div\u003e\r\n\u003c\/div\u003e\r\n\u003c\/div\u003e\r\n\u003c\/div\u003e\r\n\u003c\/div\u003e\r\n\u003c\/div\u003e\r\n\u003c\/div\u003e\r\n\u003c\/div\u003e\r\n\u003c\/div\u003e\r\n","brand":"Zero","offers":[{"title":"Default Title","offer_id":47889866227934,"sku":"HSB008","price":95.0,"currency_code":"ZAR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1242\/8790\/files\/22179_BSC-Products-8-1-13-2.png?v=1770713212","url":"https:\/\/onlino-bicycle-shopco.shop\/products\/zero-headset-bearing-30-15x41x6-5mm-45-45-r408","provider":"Online Bicycle Shop","version":"1.0","type":"link"}