{"product_id":"gcr15-steel-bicycle-ball-bearings-replacement-1kg","title":"1KG Bicycle Gcr15 Steel Ball Bearing Replacement Bearings13.5 14.288 - 19.05mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eGCr15 Steel Bicycle Ball Bearings — Consistent Roundness for Smooth, Reliable Rolling\u003c\/h2\u003e\n\u003cp\u003eWhen worn or pitted ball bearings cause grinding hubs, stiff headsets, or rough bottom bracket rotation, a precise replacement makes all the difference. These GCr15 steel bicycle ball bearings are designed for cyclists, bike mechanics, and workshop technicians who need dimensionally accurate, drop-in replacements across a wide range of bearing seats.\u003c\/p\u003e\n\u003cp\u003eEach 1 kg pack contains GCr15 high-carbon chromium bearing steel balls, available in nine diameter options ranging from 13.5 mm (approximately 0.531 in) to 19.844 mm (approximately 0.781 in). The balls are ground to tight sphericity tolerances and feature a smooth, corrosion-resistant surface finish suited for grease-packed bearing cups and caged assemblies.\u003c\/p\u003e\n\u003cp\u003eTypical applications include bicycle hub bearing replacement, headset cup repacking, bottom bracket overhaul, and general workshop bearing maintenance. Whether you are restoring a vintage road bike, servicing a fleet of commuter bicycles, or stocking a repair bench with GCr15 bicycle ball bearing replacements, the 1 kg bulk format keeps your workflow uninterrupted.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔧\u003c\/span\u003e Compatible with standard loose-ball bearing cups and caged retainers on road bikes, mountain bikes, city bikes, and BMX — verify your bearing seat diameter before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These GCr15 Steel Bicycle Ball Bearings\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cstrong\u003eGCr15 High-Carbon Chromium Steel\u003c\/strong\u003e — Through-hardened bearing steel with high load capacity and wear resistance for demanding cycling applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003eNine Diameter Options\u003c\/strong\u003e — Covers 13.5 mm through 19.844 mm in precise increments, matching the most common bicycle bearing seat sizes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔵\u003c\/span\u003e\u003cstrong\u003eTight Sphericity Tolerance\u003c\/strong\u003e — Ground to consistent roundness for smooth, low-vibration rolling and even load distribution across the bearing race.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cstrong\u003eCorrosion-Resistant Surface Finish\u003c\/strong\u003e — Smooth, polished surface resists oxidation and integrates cleanly with standard bearing grease formulations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e\u003cstrong\u003e1 kg Bulk Pack\u003c\/strong\u003e — Economical workshop quantity; enough to service multiple hubs, headsets, or bottom brackets in a single order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eDrop-In Replacement Fit\u003c\/strong\u003e — Dimensionally matched to standard loose-ball and caged retainer assemblies; no machining or modification required.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — GCr15 Bicycle Ball Bearings\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eGCr15 High-Carbon Chromium Bearing Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003e13.5 mm \/ 14.288 mm \/ 15.081 mm \/ 15.875 mm \/ 16.669 mm \/ 17.463 mm \/ 18.256 mm \/ 19.05 mm \/ 19.844 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range (Imperial)\u003c\/th\u003e\n\u003ctd\u003eApprox. 0.531 in – 0.781 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Weight\u003c\/th\u003e\n\u003ctd\u003e1 kg per pack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBall Count per Pack\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eGround \u0026amp; polished, corrosion-resistant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHardness\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplicable Assembly Type\u003c\/th\u003e\n\u003ctd\u003eLoose-ball bearing cups, caged retainer assemblies\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Applications\u003c\/th\u003e\n\u003ctd\u003eBicycle hubs, headsets, bottom brackets, general bearing maintenance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePacking Qty\u003c\/th\u003e\n\u003ctd\u003e1 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the correct ball diameter for my bicycle?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the diameter of your existing balls using a micrometer or digital caliper. Alternatively, check your hub, headset, or bottom bracket manufacturer's service manual for the specified ball size. Common road bike hub sizes fall between 13.5 mm and 15.875 mm, while larger cruiser or BMX hubs may use 19.05 mm or 19.844 mm balls. When in doubt, measure the bearing cup seat width and count the existing balls to cross-reference with standard sizing charts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does GCr15 mean, and why does it matter for bearings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eGCr15 is a high-carbon chromium bearing steel grade (roughly equivalent to AISI 52100) widely used for precision rolling elements. The high carbon content (approximately 0.95–1.05%) and chromium addition (1.3–1.65%) allow the steel to be through-hardened to high Rockwell hardness values, giving the balls excellent wear resistance, fatigue strength, and dimensional stability under cyclic loading — all critical properties for bicycle bearing applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these balls compatible with caged retainer assemblies?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. These balls are dimensionally matched to standard loose-ball and caged retainer bearing assemblies used in bicycle hubs, headsets, and bottom brackets. Confirm the ball diameter matches your retainer's pocket size before installing. If you are replacing loose balls in a cup-and-cone hub, simply match the diameter and repack with fresh bearing grease.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow should I store unused bearing balls to prevent corrosion?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eStore unused balls in a sealed container away from moisture and direct contact with dissimilar metals. A light coating of bearing grease or rust-preventive oil on stored balls will extend shelf life significantly. Avoid storing in humid environments or near solvents that could degrade any protective surface treatment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these balls in non-bicycle applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eGCr15 steel balls in these diameter ranges are also used in general mechanical assemblies, drawer slides, and light industrial bearing seats where the same diameter is specified. However, always verify the required hardness, surface finish grade, and dimensional tolerance for your specific application before substituting. These balls are optimized and marketed for bicycle bearing service.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow many balls are included in a 1 kg pack?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe ball count per kilogram varies by diameter — smaller diameter balls are lighter individually, so a 1 kg pack of 13.5 mm balls will contain significantly more pieces than a 1 kg pack of 19.844 mm balls. If you need an exact count for a specific service job, contact us to confirm the approximate quantity for your chosen diameter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat grease is recommended when repacking bearings with these balls?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA lithium-based or synthetic bicycle-specific bearing grease (such as Phil Wood Waterproof Grease or equivalent) is recommended. Apply a moderate layer to the bearing cup, seat the balls, and add a thin top coat before installing the cone or cover. Avoid petroleum-based greases that may degrade rubber seals in adjacent components.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Diameter and Packing Qty above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"13.5mm \/ 1kg","offer_id":52409676661010,"sku":"LFL2024GANGZHU4205x1","price":68.58,"currency_code":"USD","in_stock":true},{"title":"14.288mm \/ 1kg","offer_id":52409676693778,"sku":"LFL2024GANGZHU4206x1","price":68.58,"currency_code":"USD","in_stock":true},{"title":"15.081mm \/ 1kg","offer_id":52409676726546,"sku":"LFL2024GANGZHU4207x1","price":68.58,"currency_code":"USD","in_stock":true},{"title":"15.875mm \/ 1kg","offer_id":52409676759314,"sku":"LFL2024GANGZHU4208x1","price":68.58,"currency_code":"USD","in_stock":true},{"title":"16.669mm \/ 1kg","offer_id":52409676792082,"sku":"LFL2024GANGZHU4209x1","price":68.58,"currency_code":"USD","in_stock":true},{"title":"17.463mm \/ 1kg","offer_id":52409676824850,"sku":"LFL2024GANGZHU4210x1","price":68.58,"currency_code":"USD","in_stock":true},{"title":"18.256mm \/ 1kg","offer_id":52409676857618,"sku":"LFL2024GANGZHU4211x1","price":69.17,"currency_code":"USD","in_stock":true},{"title":"19.05mm \/ 1kg","offer_id":52409676890386,"sku":"LFL2024GANGZHU4212x1","price":69.17,"currency_code":"USD","in_stock":true},{"title":"19.844mm \/ 1kg","offer_id":52409676923154,"sku":"LFL2024GANGZHU4213x1","price":69.17,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture1of6_882549ce-bc90-4b64-ae50-ce393b6fc192.jpg?v=1782144353","url":"https:\/\/homediyer.com\/products\/gcr15-steel-bicycle-ball-bearings-replacement-1kg","provider":"HomeDIYer","version":"1.0","type":"link"}