{"product_id":"full-speed-ahead-headsets-28-6-hd4591-bicycle-headsets","title":"Heavy-Duty 1-1 - 8\" Threadless Headset with Steel CNC Machined Cups, Alloy Top Cover, Alloy Components, Black Anodized Finish, for Mountain \u0026 Road Bikes","description":"\u003cdiv id=\"seqbpdescription-1\"\u003e\u003cp\u003eIntroducing the Full Speed Ahead Mallet 1-1\/8\" Heavy Duty Threadless Headset in sleek Black - the ultimate choice for cyclists seeking durability, precision, and performance. Crafted with high-quality materials and engineered for demanding riding conditions, this headset ensures smooth steering and long-lasting reliability on every ride.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-2\"\u003e\u003cp\u003eMaterials \u0026amp; Construction:\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-3\"\u003e\u003cp\u003eBuilt from forged and CNC-machined steel cups for enhanced strength and precision, the Full Speed Ahead Mallet headset features an alloy top cover for lightweight durability. The use of high-grade alloy and steel ensures maximum resistance to wear and corrosion, making it suitable for all types of terrain and weather conditions.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-4\"\u003e\u003cp\u003ePerformance \u0026amp; Engineering:\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-5\"\u003e\u003cp\u003eDesigned for heavy-duty use, this headset incorporates robust 5\/32 x 20 and oversized 3\/16 x 20B loose ball retainer bearings, offering superior load distribution and longevity. With a stack height of just 25.8mm, it provides a low-profile fit that maintains optimal front-end geometry, improving handling and stability during aggressive riding or climbing.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-6\"\u003e\u003cp\u003eComponents \u0026amp; Technology:\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-7\"\u003e\u003cp\u003eCompatible with 1-1\/8\" steerer tubes and featuring a 30 Crown Race, the Mallet headset uses EC34\/28.6 (5\/32x20) and EC34\/30 (3\/16x20) bearing sizes for versatile installation on modern bikes. The streamlined, threadless design integrates seamlessly with a variety of bicycle frames, enhancing ease of installation and adjustment for professional results.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-8\"\u003e\u003cp\u003eStyle \u0026amp; Use Case:\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-9\"\u003e\u003cp\u003eSporting a sleek black finish, this headset complements a professional or aggressive mountain bike, gravel, or cyclocross build. Its heavy-duty construction makes it ideal for riders who demand high performance, whether tackling rugged trails, endurance races, or daily commutes. The minimalist aesthetic pairs perfectly with modern, performance-oriented bikes.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-10\"\u003e\u003cp\u003eInnovative \u0026amp; Differentiating Features:\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-11\"\u003e\u003cp\u003e- Heavy-duty retainer bearings for enhanced durability and smooth steering\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-12\"\u003e\u003cp\u003e- Forged and CNC-machined steel cups for precise fit and longevity\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-13\"\u003e\u003cp\u003e- Low stack height for improved front-end geometry and handling\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-14\"\u003e\u003cp\u003e- Wide compatibility with EC34\/28.6 and EC34\/30 bearing standards\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-15\"\u003e\u003cp\u003e- Lightweight alloy top cover reduces weight without sacrificing strength\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-16\"\u003e\u003cp\u003eSpecifications:\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-17\"\u003e\u003cp\u003e- Color: Black\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-18\"\u003e\u003cp\u003e- Bearing Type: Loose Ball Bearings (5\/32x20 \u0026amp; 3\/16x20B)\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-19\"\u003e\u003cp\u003e- Steerer Compatibility: 1-1\/8\" Threadless (28.6mm OD)\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-20\"\u003e\u003cp\u003e- Crown Race Diameter: 30mm\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-21\"\u003e\u003cp\u003e- Stack Height: 25.8mm (combined upper and lower cups)\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-22\"\u003e\u003cp\u003e- Weight: 150 grams\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-23\"\u003e\u003cp\u003e- S.H.I.S. Standards: EC34\/28.6 and EC34\/30\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-24\"\u003e\u003cp\u003eUpgrade your bike's steering performance with the Full Speed Ahead Mallet 1-1\/8\" Heavy Duty Threadless Headset - engineered for durability, precision, and style. Perfect for serious riders who demand the best in components, longevity, and ride quality.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpfeatures\"\u003e\u003cul\u003e\n\u003cli\u003eHeavy-duty 1-1\/8\" threadless headset engineered with high-strength alloy top cover and forged CNC-machined steel cups for maximum durability and longevity in demanding cycling conditions. \u003c\/li\u003e\n\u003cli\u003eDesigned with oversized 3\/16\" retainer bearings, this headset ensures smooth steering performance and enhanced stability for mountain biking, touring, and aggressive riding styles. \u003c\/li\u003e\n\u003cli\u003eUtilizes innovative EC34\/28.6 and EC34\/30 bearing specifications, providing precise fitment and optimized load distribution for increased bearing life and consistent handling. \u003c\/li\u003e\n\u003cli\u003eSleek black anodized finish offers a stylish, corrosion-resistant look, making it ideal for both aesthetic appeal and outdoor durability across various cycling disciplines. \u003c\/li\u003e\n\u003cli\u003eFeatures a lightweight 150g construction with a 25.8mm stack height, offering compatibility with 1-1\/8\" steerer tubes and making it a reliable upgrade for performance-focused cyclists.\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/div\u003e","brand":"Full Speed Ahead","offers":[{"title":"Default Title","offer_id":42201595641923,"sku":"HD4591","price":22.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1608\/6187\/files\/HD4591.jpg?v=1780522207","url":"https:\/\/365cycles.com\/products\/full-speed-ahead-headsets-28-6-hd4591-bicycle-headsets","provider":"365 Cycles","version":"1.0","type":"link"}