{"product_id":"gcr15-steel-ball-bearing-g10-bicycle-replacement-10mm-30mm","title":"Durable Bicycle Gcr15 Steel Ball Bearing G10 Replacement Bearings Dia: 10mm-30mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eGCr15 G10 Steel Ball Bearings — Precision Bicycle Replacement Bearings, 10–30mm\u003c\/h2\u003e\n\u003cp\u003eWhen a worn or pitted bearing turns a smooth ride into a grinding ordeal, finding an exact-diameter replacement fast is what separates a quick fix from a full afternoon of frustration. These GCr15 G10 steel ball bearings are sized for cyclists, mechanics, and workshop DIYers who need a reliable drop-in replacement without guesswork.\u003c\/p\u003e\n\u003cp\u003eEach bearing is machined from GCr15 high-carbon chromium bearing steel and finished to ABEC\/ISO G10 precision grade. Diameters span 10mm through 30mm (approximately 0.394 in to 1.181 in), sold individually or in packs of 5 or 10 to match your service quantity. The surface is precision-ground and polished to minimize rolling resistance and extend service life.\u003c\/p\u003e\n\u003cp\u003eTypical applications include bicycle wheel hub bearings, bottom bracket cartridge service, headset cup replacement, and general workshop bearing repairs where a loose-ball or caged-ball GCr15 G10 replacement bearing is specified. The consistent diameter tolerance makes these suitable for both metric and inch-equivalent bearing seats across road, mountain, and commuter bicycle platforms.\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:\u003c\/strong\u003e Designed for bicycle hubs, bottom brackets, headsets, and general bearing seats requiring GCr15 G10 loose ball bearings. Verify your bearing seat diameter before ordering — select your exact diameter from the variant options above.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These GCr15 G10 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\u003eGCr15 Bearing Steel Construction\u003c\/strong\u003e — High-carbon chromium alloy steel delivers the hardness and fatigue resistance needed for repetitive rolling-contact loads in bicycle drivetrains and wheel hubs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eG10 Precision Grade\u003c\/strong\u003e — Ground and lapped to G10 (ISO 3290) dimensional tolerances, ensuring consistent diameter and sphericity for smooth, low-noise operation in precision bearing seats.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003eWide Diameter Range: 10mm–30mm\u003c\/strong\u003e — Twenty-two diameter options from 10mm (0.394 in) to 30mm (1.181 in) cover the majority of bicycle hub, bottom bracket, and headset bearing specifications in a single product listing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cstrong\u003eCorrosion-Resistant Surface Finish\u003c\/strong\u003e — Precision-polished surface reduces surface porosity and resists oxidation under typical cycling conditions including wet-weather riding and workshop storage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Available in 1-piece, 5-piece, and 10-piece packs so you can order exactly what a single service job or a full workshop restock requires, without overpaying for excess stock.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eDirect Drop-In Replacement\u003c\/strong\u003e — Diameter-matched to standard bicycle bearing seats; no machining or modification required for hubs and bottom brackets specifying GCr15 G10 loose ball bearings in the listed size range.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — GCr15 G10 Steel 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\u003ePrecision Grade\u003c\/th\u003e\n\u003ctd\u003eG10 (ISO 3290)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003e10mm – 30mm (0.394 in – 1.181 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003e10, 10.319, 11.113, 11.509, 11.906, 12, 12.3, 12.7, 13.5, 14.288, 15.081, 15.875, 16.669, 17.463, 18.256, 19.05, 19.844, 20, 20.638, 22.225, 25.4, 30 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003ePrecision-ground and polished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity Options\u003c\/th\u003e\n\u003ctd\u003e1 pcs \/ 5 pcs \/ 10 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Application\u003c\/th\u003e\n\u003ctd\u003eBicycle hubs, bottom brackets, headsets, general bearing seats\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\u003eWeight (per piece)\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 find the correct diameter for my bicycle bearing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eRemove the existing bearing from the hub, bottom bracket, or headset cup and measure its diameter with a digital caliper. Match that measurement to the closest diameter listed in the variant options. For hubs, the bearing diameter is typically stamped on the bearing race or listed in the wheel manufacturer's service manual.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does G10 precision grade mean for a ball bearing?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eG10 refers to the ISO 3290 grade classification for ball bearing sphericity and diameter variation. A G10 ball has a maximum deviation of 0.25 µm from a perfect sphere, making it suitable for precision bicycle bearing applications where smooth rolling and low vibration are required. Lower grade numbers (G3, G5) are tighter; G10 is the standard for most bicycle service applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these bearings corrosion-resistant enough for wet-weather cycling?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eGCr15 steel is not stainless steel, so prolonged exposure to standing water without lubrication will eventually cause surface oxidation. For wet-weather use, pack the bearing seat with a waterproof grease (such as a lithium-complex or marine-grade grease) after installation. This creates a moisture barrier and significantly extends service life in rain or muddy conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these bearings in a cartridge bottom bracket or only loose-ball cups?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese are loose ball bearings intended for cup-and-cone style hubs and bottom brackets, or any bearing seat that accepts individual balls rather than a sealed cartridge unit. They are not compatible with sealed cartridge bottom brackets (such as press-fit BB86 or threaded BSA cartridges), which use pre-assembled bearing units.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow many balls do I need per hub or bottom bracket service?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe number of balls per bearing race varies by component. A typical front hub uses 9–10 balls per side (18–20 total), a rear hub uses 9 balls per drive side and 9 per non-drive side, and a cup-and-cone bottom bracket uses approximately 11 balls per side. Check your component's service documentation or count the existing balls before ordering to select the correct pack quantity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the 1-piece, 5-piece, and 10-piece pack options?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAll three pack options contain the same G10 GCr15 steel balls at the selected diameter — the only difference is quantity. The 1-piece option suits a single replacement or test fit. The 5-piece pack covers a single hub side service for most standard hubs. The 10-piece pack is suited for a full hub overhaul (both sides) or stocking a workshop with spares for recurring maintenance jobs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these compatible with both metric and inch-specification bearing seats?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Several diameters in the range correspond to common inch-fraction specifications — for example, 25.4mm equals exactly 1 inch, and 19.05mm equals 3\/4 inch. If your component specifies an inch diameter, convert it to millimeters and select the matching variant. For non-standard sizes, contact us to confirm fit before ordering.\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":"10mm \/ 1pcs","offer_id":52409674498322,"sku":"LFL2024GANGZHU4174x1","price":3.77,"currency_code":"USD","in_stock":true},{"title":"10.319mm \/ 1pcs","offer_id":52409674531090,"sku":"LFL2024GANGZHU4175x1","price":3.77,"currency_code":"USD","in_stock":true},{"title":"11.113mm \/ 1pcs","offer_id":52409674563858,"sku":"LFL2024GANGZHU4176x1","price":3.77,"currency_code":"USD","in_stock":true},{"title":"11.509mm \/ 1pcs","offer_id":52409674596626,"sku":"LFL2024GANGZHU4177x1","price":3.77,"currency_code":"USD","in_stock":true},{"title":"11.906mm \/ 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