{"product_id":"bicycle-45-steel-ball-bearing-replacement-5-46mm-7-03mm","title":"Durable Bicycle 45# Steel Ball Bearing Replacement Bearings Size: 5.46mm-7.03mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eBicycle 45# Steel Ball Bearings — Precision Replacement Rolling Elements for Demanding Riders\u003c\/h2\u003e\n\u003cp\u003eWhen a worn or pitted ball bearing causes your wheel hub, headset, or bottom bracket to feel rough and imprecise, finding the exact replacement diameter is the difference between a smooth rebuild and a wasted afternoon. Cyclists, bike mechanics, and workshop technicians who need reliable, dimensionally accurate rolling elements will find this range covers the most common bicycle bearing diameters in a single product listing.\u003c\/p\u003e\n\u003cp\u003eEach pack contains 100 solid steel balls manufactured from 45# carbon steel — a medium-high carbon alloy known for its balance of hardness and toughness. Diameters span 5.46 mm to 7.03 mm (~0.215\" to ~0.277\") across 24 selectable sizes, allowing precise matching to OEM bearing races without guesswork. Surface finish is smooth and consistent to minimize rolling resistance within the race.\u003c\/p\u003e\n\u003cp\u003eTypical applications include loose-ball cup-and-cone wheel hubs on road and mountain bikes, threaded headset assemblies requiring 5.5–7 mm balls, vintage bottom bracket overhaul kits, and general small-diameter bearing replacement in BMX, folding bikes, and cargo cycles. The 100-piece pack quantity suits both single-bike rebuilds and workshop stock replenishment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eCompatibility Note:\u003c\/strong\u003e These balls are designed for standard cup-and-cone bearing assemblies. Always measure your existing balls with a micrometer before ordering — select the diameter that matches your race specification. Not intended for sealed cartridge bearing replacement.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Bicycle 45# Steel Ball Bearings\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003e45# Carbon Steel Construction\u003c\/strong\u003e — Medium-high carbon alloy provides the hardness needed to resist deformation under radial load while maintaining enough toughness to absorb road vibration without fracturing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003e24 Selectable Diameters\u003c\/strong\u003e — Sizes from 5.46 mm to 7.03 mm (approx. 0.215\"–0.277\") cover the most common loose-ball bicycle bearing specifications, reducing the need to source from multiple suppliers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eConsistent Dimensional Accuracy\u003c\/strong\u003e — Each ball is ground to a uniform diameter within the stated size, ensuring even load distribution across all balls in the race and preventing premature race wear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003e100-Piece Pack Quantity\u003c\/strong\u003e — Sufficient for multiple bearing positions on a single bike or for stocking a workshop. Reduces per-unit cost compared to small-quantity purchases.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eDirect OEM-Style Replacement\u003c\/strong\u003e — Matches the loose-ball format used in traditional cup-and-cone hubs, threaded headsets, and vintage bottom brackets — no retainer cage required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e\u003cstrong\u003eWorkshop-Ready Surface Finish\u003c\/strong\u003e — Smooth, burr-free surface allows balls to seat cleanly into grease-packed races without pre-cleaning, speeding up overhaul time.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Bicycle Steel Ball Bearings\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e45# Carbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003e5.46 mm – 7.03 mm (approx. 0.215\" – 0.277\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Sizes\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e100 pcs per pack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBall Type\u003c\/th\u003e\n\u003ctd\u003eLoose (retainer-free)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eGround, smooth\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Application\u003c\/th\u003e\n\u003ctd\u003eCup-and-cone wheel hubs, headsets, bottom brackets\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Bike Types\u003c\/th\u003e\n\u003ctd\u003eRoad, mountain, BMX, folding, cargo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight (per pack)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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 know which diameter to order?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eRemove the existing balls from your bearing race and measure one with a digital micrometer or caliper. Match that measurement to the closest available diameter in the variant selector. If your measurement falls between two sizes, select the smaller diameter — a slightly undersized ball will roll more freely, while an oversized ball may bind in the race.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these balls compatible with sealed cartridge bearings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. These loose balls are designed exclusively for open cup-and-cone bearing assemblies. Sealed cartridge bearings (such as those found in many modern hubs and bottom brackets) are factory-assembled units and cannot be repacked with individual loose balls.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is 45# steel and how does it compare to chrome steel (52100)?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e45# steel is a medium-high carbon steel (approximately 0.42–0.50% carbon) that offers a practical balance of hardness and toughness for general bearing applications. Chrome steel (52100) is a bearing-grade alloy with higher hardness and fatigue resistance, typically used in precision industrial bearings. For standard bicycle cup-and-cone applications — where balls are replaced periodically as part of routine maintenance — 45# steel provides adequate service life at a lower cost per pack.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow many balls do I need per bearing position?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe number of balls per race varies by component and diameter. A typical front hub uses 9–10 balls per side; a rear hub uses 9 balls per side; a threaded headset uses 18–22 balls per race. Consult your component's service manual or count the existing balls before ordering. A 100-piece pack is generally sufficient for a full bike overhaul with spare balls remaining.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these balls require any special grease or lubricant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eStandard bicycle bearing grease (such as a lithium-based or waterproof grease rated for cup-and-cone use) is appropriate. Apply a generous layer to the race before seating the balls. Avoid thin oils as the sole lubricant — they do not provide adequate film thickness under radial load and will wash out quickly in wet conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I mix balls of different diameters in the same race?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. All balls in a single bearing race must be the same diameter. Mixing sizes causes uneven load distribution, accelerated race wear, and rough rolling feel. Always replace all balls in a race at the same time with balls of identical diameter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow should I store unused balls from the pack?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eStore unused balls in a sealed container away from moisture and contaminants. A small zip-lock bag or parts container with a lid works well. Exposure to humidity over extended periods can cause surface oxidation, which may affect rolling smoothness. Lightly coating stored balls with a thin film of grease or oil before sealing the container will extend shelf life.\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":"5.46mm \/ 100pcs","offer_id":52410415579410,"sku":"LFL2024GANGZHU4814x100","price":13.84,"currency_code":"USD","in_stock":true},{"title":"5.48mm \/ 100pcs","offer_id":52410415612178,"sku":"LFL2024GANGZHU4815x100","price":13.84,"currency_code":"USD","in_stock":true},{"title":"5.5mm \/ 100pcs","offer_id":52410415644946,"sku":"LFL2024GANGZHU4816x100","price":14.01,"currency_code":"USD","in_stock":true},{"title":"5.9mm \/ 100pcs","offer_id":52410415677714,"sku":"LFL2024GANGZHU4817x100","price":15.37,"currency_code":"USD","in_stock":true},{"title":"5.95mm \/ 100pcs","offer_id":52410415710482,"sku":"LFL2024GANGZHU4818x100","price":15.48,"currency_code":"USD","in_stock":true},{"title":"5.98mm \/ 100pcs","offer_id":52410415743250,"sku":"LFL2024GANGZHU4819x100","price":15.64,"currency_code":"USD","in_stock":true},{"title":"6mm \/ 100pcs","offer_id":52410415776018,"sku":"LFL2024GANGZHU4820x100","price":15.75,"currency_code":"USD","in_stock":true},{"title":"6.01mm \/ 100pcs","offer_id":52410415808786,"sku":"LFL2024GANGZHU4821x100","price":15.75,"currency_code":"USD","in_stock":true},{"title":"6.02mm \/ 100pcs","offer_id":52410415841554,"sku":"LFL2024GANGZHU4822x100","price":15.75,"currency_code":"USD","in_stock":true},{"title":"6.03mm \/ 100pcs","offer_id":52410415874322,"sku":"LFL2024GANGZHU4823x100","price":15.75,"currency_code":"USD","in_stock":true},{"title":"6.3mm \/ 100pcs","offer_id":52410415907090,"sku":"LFL2024GANGZHU4824x100","price":16.84,"currency_code":"USD","in_stock":true},{"title":"6.35mm \/ 100pcs","offer_id":52410415939858,"sku":"LFL2024GANGZHU4825x100","price":17.11,"currency_code":"USD","in_stock":true},{"title":"6.5mm \/ 100pcs","offer_id":52410415972626,"sku":"LFL2024GANGZHU4826x100","price":17.65,"currency_code":"USD","in_stock":true},{"title":"6.6mm \/ 100pcs","offer_id":52410416005394,"sku":"LFL2024GANGZHU4827x100","price":18.2,"currency_code":"USD","in_stock":true},{"title":"6.7mm \/ 100pcs","offer_id":52410416038162,"sku":"LFL2024GANGZHU4828x100","price":18.63,"currency_code":"USD","in_stock":true},{"title":"6.75mm \/ 100pcs","offer_id":52410416070930,"sku":"LFL2024GANGZHU4829x100","price":18.9,"currency_code":"USD","in_stock":true},{"title":"6.8mm \/ 100pcs","offer_id":52410416103698,"sku":"LFL2024GANGZHU4830x100","price":19.01,"currency_code":"USD","in_stock":true},{"title":"6.9mm \/ 100pcs","offer_id":52410416136466,"sku":"LFL2024GANGZHU4831x100","price":19.56,"currency_code":"USD","in_stock":true},{"title":"6.95mm \/ 100pcs","offer_id":52410416169234,"sku":"LFL2024GANGZHU4832x100","price":19.83,"currency_code":"USD","in_stock":true},{"title":"6.98mm \/ 100pcs","offer_id":52410416202002,"sku":"LFL2024GANGZHU4833x100","price":19.99,"currency_code":"USD","in_stock":true},{"title":"7mm \/ 100pcs","offer_id":52410416234770,"sku":"LFL2024GANGZHU4834x100","price":20.1,"currency_code":"USD","in_stock":true},{"title":"7.01mm \/ 100pcs","offer_id":52410416267538,"sku":"LFL2024GANGZHU4835x100","price":20.1,"currency_code":"USD","in_stock":true},{"title":"7.02mm \/ 100pcs","offer_id":52410416300306,"sku":"LFL2024GANGZHU4836x100","price":20.1,"currency_code":"USD","in_stock":true},{"title":"7.03mm \/ 100pcs","offer_id":52410416333074,"sku":"LFL2024GANGZHU4837x100","price":20.26,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-03_22873c6a-9ada-471a-b434-4052dd990b06.jpg?v=1782442152","url":"https:\/\/homediyer.com\/products\/bicycle-45-steel-ball-bearing-replacement-5-46mm-7-03mm","provider":"HomeDIYer","version":"1.0","type":"link"}