{"product_id":"wolf-tooth-alsl-52100-custom-86-mm-shimano-hollowtech-ii-bottom-bracket-btbk1254-bicycle-bottom-brackets","title":"Wolf Tooth BSA Bottom Bracket - English (BSA) 68 - 73mm, 24mm Spindle, Alloy \u0026 Chrome Bearing Technology, Weather-Sealed, Durable, Lightweight Bike Crankset Component","description":"\u003cdiv id=\"seqbpdescription-1\"\u003e\u003cp\u003eUpgrade your bike's performance with the Wolf Tooth Bottom Bracket-engineered for durability, smoothness, and precision. Designed for English (BSA) frames with 68\/73mm shell widths, this high-quality bottom bracket is the perfect choice for riders seeking reliable power transfer and effortless pedaling in all conditions.\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\u003eCrafted from lightweight 6061-T6 aluminum with custom machined components, the Wolf Tooth Bottom Bracket features AISI 52100 chrome bearing steel balls and race rings, hardened to Rc 60-66 for exceptional durability and reduced friction. The race surfaces are coated with ACOSUR ZNA, a corrosion-resistant treatment that withstands harsh environments, including saltwater exposure-ensuring longevity and peak performance over time.\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 maximum efficiency, this bottom bracket boasts custom bearings with optimized radial compression, preload, and alignment for low-drag, silky-smooth pedaling. Its best-in-class weather sealing shields the bearings from water, mud, and trail debris, maintaining consistent performance across diverse riding conditions. The sealed bearings and elimination of metal-on-metal contact minimize creaking and noise, delivering a quiet, reliable ride.\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\u003eEquipped with a custom polymer spindle bushing, the Wolf Tooth Bottom Bracket greatly reduces creaking and extends component lifespan. Its adjustable-width internal sleeve accommodates frames with shell widths from 68mm to 73mm, while optional 83mm and 100mm sleeves are available for wider frames. Installation is straightforward using standard 44-16 (24mm spindle) and 46-12 (29mm DUB, 30mm spindle) spline tools, making maintenance easy for enthusiasts and pros alike.\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\u003eAvailable in sleek black to match your bike's aesthetic, this bottom bracket is ideal for mountain biking, gravel riding, and commuter bikes where durability and performance matter most. Its versatile compatibility with Shimano Hollowtech II, RaceFace EXI, and other 24mm spindle cranksets makes it a versatile upgrade for a variety of setups.\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- Corrosion Resistance: ACOSUR ZNA coating on bearings for superior rust and saltwater protection\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-12\"\u003e\u003cp\u003e- Enhanced Durability: Hardened chrome steel balls and race rings for prolonged lifespan and reduced rolling resistance\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-13\"\u003e\u003cp\u003e- User-Serviceable Design: Easy replacement parts and comprehensive service guides support long-term maintenance\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-14\"\u003e\u003cp\u003e- Made in the USA: Precision engineering and assembly at Wolf Tooth HQ for guaranteed quality\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-15\"\u003e\u003cp\u003eSpecs \u0026amp; Compatibility:\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-16\"\u003e\u003cp\u003e- Shell Widths: 68mm, 73mm (additional sleeves for 83mm \u0026amp; 100mm available)\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-17\"\u003e\u003cp\u003e- Spindle Compatibility: 24mm, 29mm (DUB), 30mm spindle options\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-18\"\u003e\u003cp\u003e- Weight: 83g (24mm), 87g (29mm), 82g (30mm)\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-19\"\u003e\u003cp\u003e- Materials: Aluminum, glass-filled nylon, chrome steel bearings\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-20\"\u003e\u003cp\u003e- Included: Spacers for precise fitment, shell and spindle spacers\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpdescription-21\"\u003e\u003cp\u003eElevate your riding experience with the Wolf Tooth Bottom Bracket-a perfect blend of precision engineering, high-performance materials, and user-focused design. Built to withstand the toughest trails and weather conditions, this bottom bracket ensures smooth, reliable power transfer mile after mile.\u003c\/p\u003e\u003c\/div\u003e\u003cdiv id=\"seqbpfeatures\"\u003e\u003cul\u003e\n\u003cli\u003eHigh-performance Wolf Tooth Bottom Bracket - English (BSA), 68\/73mm, 24mm Spindle, Black ensures smooth pedaling and durability in all conditions. \u003c\/li\u003e\n\u003cli\u003eEngineered with custom chrome bearing steel hardened to Rc 61-66, offering reduced friction, enhanced efficiency, and long-lasting performance for competitive and recreational riders. \u003c\/li\u003e\n\u003cli\u003eBest-in-class weather sealing with advanced seals and grease channels protects components from water, mud, and trail debris, enabling reliable use in various environmental conditions. \u003c\/li\u003e\n\u003cli\u003eCompatible with 24mm Shimano Hollowtech II, RaceFace EXI, and other spindle standards, with adjustable-width shells fitting 68 and 73mm bottom bracket shells for versatile bicycle setup. \u003c\/li\u003e\n\u003cli\u003eConstructed from lightweight 6061-T6 aluminum, glass-filled nylon, and resilient sealing materials, this bottom bracket offers a balance of strength, weight savings, and easy installation with standard crank tool compatibility.\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/div\u003e","brand":"Wolf Tooth","offers":[{"title":"Default Title","offer_id":42328063574083,"sku":"BTBK1254","price":132.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1608\/6187\/files\/CR4662.jpg?v=1779347658","url":"https:\/\/365cycles.com\/products\/wolf-tooth-alsl-52100-custom-86-mm-shimano-hollowtech-ii-bottom-bracket-btbk1254-bicycle-bottom-brackets","provider":"365 Cycles","version":"1.0","type":"link"}