{"product_id":"helix-race-al-crank-155mm-bosch-brose-s-e-thirteen","title":"ethirteen Helix Race Alloy espec Cranks for ISIS Spindle - 155mm, 26mm Offset, Black","description":"\u003cp data-path-to-node=\"3\"\u003eThe e\u003cem data-path-to-node=\"3\" data-index-in-node=\"5\"\u003ethirteen Helix Race Alloy e\u003c\/em\u003espec Cranks are a premium, high-strength alternative to carbon fiber, engineered specifically for high-torque ISIS spindle e-bike motors. Forged and precision CNC-sculpted from 6066-T6 aluminum, these ultra-short 155mm crank arms maximize ground clearance on modern low-BB geometries. Featuring a 26.5mm offset for a balanced Q-factor, integrated alloy self-extractors, and impact-absorbing crank boots, they deliver maximum durability and weight-efficient performance on Bosch, TQ, Brose, Yamaha, and specialized e-MTB platforms.\u003c\/p\u003e\u003cbr\u003e\n\u003ch2 data-path-to-node=\"5\"\u003e \u003c\/h2\u003e\u003cbr\u003e\u003cbr\u003e\u003cp\u003e\u003cstrong\u003ee*thirteen Helix Race Alloy e*spec Cranks for ISIS Spindle Motor Systems - 155mm, 26mm Offset, Black\u003c\/strong\u003e\u003c\/p\u003e\u003cbr\u003e\n\u003cp\u003eUpgrade your electric mountain bike with the stiff, lightweight, and beautifully engineered \u003cstrong\u003ee*thirteen Helix Race Alloy e*spec Cranks\u003c\/strong\u003e. Forged and precision CNC-sculpted from premium 6066-T6 aluminum, these high-performance crank arms offer an incredibly robust, impact-resistant alternative to carbon fiber without the weight penalty. Purpose-built to handle the demanding, high-torque output of aggressive e-MTB riding, they feature a low overall profile and pair seamlessly with Helix Race e*spec Direct Mount chainrings to deliver the ultimate combination of premium trail performance and clean, factory integration.\u003c\/p\u003e\u003cbr\u003e\n\u003cp\u003eThis model is engineered for standard \u003cstrong\u003eISIS spindle motor interfaces\u003c\/strong\u003e, providing extensive compatibility across the industry's leading e-bike platforms, including Bosch CX Gen 4\/Gen 5, Bosch SX, TQ HPR50, Brose S Mag, DJI Avinox, Yamaha, and Specialized Turbo Levo\/SL motor systems. Featuring a \u003cstrong\u003e26.5mm offset\u003c\/strong\u003e, these cranks achieve an optimized 182.9mm Q-factor. This precise geometry balances internal motor casing clearance with a natural, ergonomic stance width that optimizes pedaling efficiency and maximizes control when navigating technical trail features.\u003c\/p\u003e\u003cbr\u003e\n\u003cp\u003eAt an ultra-short \u003cstrong\u003e155mm length\u003c\/strong\u003e, these crank arms are explicitly designed to combat pedal strikes on modern, low bottom-bracket frame geometries. Shorter crank lengths allow riders to maintain a high, fluid pedaling cadence through rocky, root-strewn climbs, significantly improving technical climbing capability while enhancing descending stability. The assembly is built to last with premium 7075 alloy hardware, integrated alloy self-extractors for effortless tool-free extraction, and an e*thirteen Adaptive Preload System (APS) adjuster for simple, play-free bearing setup.\u003c\/p\u003e\u003cbr\u003e\n\u003cp\u003eWeighing \u003cstrong\u003e413g\u003c\/strong\u003e, these stealthy black anodized crank arms are engineered to take a beating. The full CNC finish strips away unnecessary material to maximize the strength-to-weight ratio, while the included **custom-molded protective crank boots** act as a resilient shield against inevitable rock strikes and trail debris. Fully engineered for continuous, high-performance trail abuse, the Helix Race Alloy e*spec cranks are backed by e*thirteen's dependable 5-year manufacturer warranty.\u003c\/p\u003e\u003cbr\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cbr\u003e\n\u003cul\u003e\n\u003cbr\u003e\n\u003cli\u003e\n\u003cstrong\u003eForged \u0026amp; CNC-Machined 6066-T6 Alloy:\u003c\/strong\u003e Sculpted structural design delivers maximum impact resistance and stiffness, serving as an elite alternative to carbon fiber\u003c\/li\u003e\n\u003cbr\u003e\n\u003cli\u003e\n\u003cstrong\u003eUltra-Short 155mm Length:\u003c\/strong\u003e Dramatically increases ground clearance on low-BB frame designs to eliminate pedal strikes on technical singletrack\u003c\/li\u003e\n\u003cbr\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard ISIS Spindle Interface:\u003c\/strong\u003e Broadly compatible with Bosch CX Gen 4\/5, Bosch SX, TQ HPR50, Brose S Mag, DJI Avinox, Yamaha, and Specialized systems\u003c\/li\u003e\n\u003cbr\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized 26.5mm Offset:\u003c\/strong\u003e Delivers a balanced 182.9mm Q-factor to ensure clear motor integration and a natural, ergonomic pedaling stance\u003c\/li\u003e\n\u003cbr\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium Pro-Level Hardware:\u003c\/strong\u003e Outfitted with 7075 alloy hardware, an integrated self-extractor mechanism, and an APS bearing preload adjuster\u003c\/li\u003e\n\u003cbr\u003e\n\u003cli\u003e\n\u003cstrong\u003eHuckproof Crank Boots Included:\u003c\/strong\u003e Includes custom-molded, high-impact composite protective boots to guard crank ends against rock-strike damage\u003c\/li\u003e\n\u003cbr\u003e\n\u003c\/ul\u003e\u003cbr\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cbr\u003e\n\u003cul\u003e\n\u003cbr\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e e*thirteen Helix Race Alloy e*spec Cranks\u003c\/li\u003e\n\u003cbr\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrank Arm Length:\u003c\/strong\u003e 155mm\u003c\/li\u003e\n\u003cbr\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpindle Interface Type:\u003c\/strong\u003e ISIS Spindle\u003c\/li\u003e\n\u003cbr\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrank Offset:\u003c\/strong\u003e 26.5mm\u003c\/li\u003e\n\u003cbr\u003e\n\u003cli\u003e\n\u003cstrong\u003eRealized Q-Factor:\u003c\/strong\u003e 182.9mm\u003c\/li\u003e\n\u003cbr\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor System Compatibility:\u003c\/strong\u003e Bosch (CX Gen4\/5, SX), TQ (HPR50), Brose (S Mag), DJI (Avinox), Yamaha, Specialized (2.2\/3.1)\u003c\/li\u003e\n\u003cbr\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Forged and CNC-Machined AL-6066-T6 Aluminum\u003c\/li\u003e\n\u003cbr\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardware Material:\u003c\/strong\u003e 7075 Aluminum\u003c\/li\u003e\n\u003cbr\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtraction Mechanism:\u003c\/strong\u003e Integrated Alloy Self-Extractor\u003c\/li\u003e\n\u003cbr\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustment System:\u003c\/strong\u003e e*thirteen APS (Adaptive Preload System) Adjuster\u003c\/li\u003e\n\u003cbr\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 413g\u003c\/li\u003e\n\u003cbr\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cbr\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 5 Years\u003c\/li\u003e\n\u003cbr\u003e\n\u003c\/ul\u003e\u003cbr\u003e\n\u003cp\u003eA premium, high-stiffness alloy crank arm upgrade combining a rock-clearance-maximizing 155mm length with elite ISIS spindle motor compatibility, built for aggressive e-MTB riders who demand ultimate durability and weight-efficient power transfer.\u003c\/p\u003e\u003cbr\u003e","brand":"Ethirteen","offers":[{"title":"CS4EAA-100","offer_id":50396499443991,"sku":"","price":464.0,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0764\/3486\/6455\/files\/Helix_Race_espec_AL_cranks_155mm_Bosch_gen4_black.jpg?v=1745073123","url":"https:\/\/shop.bikesandscooters.co.nz\/products\/helix-race-al-crank-155mm-bosch-brose-s-e-thirteen","provider":"Bikes \u0026 Scooters Marlborough","version":"1.0","type":"link"}