{"product_id":"alps2ocean-bike-crank-arms-forged-6061-alloy-diamond-hole-170mm-lightweight-durable-ebike-replacement","title":"Alps2Ocean Bike Crank Arms — Forged 6061 Alloy Diamond-Hole 170mm | Lightweight Durable Ebike Replacement","description":"\u003cp\u003e\u003cstrong\u003eAlps2Ocean Bike Crank Arms are forged 6061-alloy replacement crank arms with a 12mm diamond-hole spindle interface, offered in ten lengths to fit a wide range of ebikes and bicycles.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese crank arms are engineered to deliver reliable strength and a precise fit for mid-motor electric bicycles and conventional bikes that accept a diamond-hole interface. Built from forged 6061 aluminum, they resist deformation while keeping weight low. Choose from ten lengths — from 89 mm for aggressive riding positions to 175 mm for riders who need extra leverage — and install the left and right arms labeled L and R for correct operation.\u003c\/p\u003e\n\n\u003ch3\u003eWhich lengths are available and how do I pick the right one?\u003c\/h3\u003e\n\u003cp\u003eAlps2Ocean offers ten crank arm lengths: 89, 102, 114, 127, 140, 152, 160, 165, 170, and 175 mm. Shorter arms suit aggressive or high-cadence riding, while longer arms increase leverage and are better for lower-cadence, torque-focused situations. Measure your current crank length or consult a bike fit specialist to match pedaling style and knee comfort.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eLengths cover compact to long-crank needs (89–175 mm).\u003c\/li\u003e\n  \u003cli\u003eShort arms favor quick cadence and clearance in technical riding.\u003c\/li\u003e\n  \u003cli\u003eLong arms deliver more torque for climbing or heavy loads.\u003c\/li\u003e\n  \u003cli\u003eConfirm measurement from pedal spindle center to crank center.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat is the spindle interface and will it fit my bike?\u003c\/h3\u003e\n\u003cp\u003eThese crank arms use a diamond-hole spindle interface with a 12 mm hole diameter designed for compatible mid-mounted motors and certain ebike bottom brackets. Verify the diamond-hole orientation and size on your current crank or motor. Using mismatched interfaces will prevent installation, so compare shapes and dimensions before buying.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDiamond-hole interface: 12 mm diameter.\u003c\/li\u003e\n  \u003cli\u003eCompatible with mid-mounted motors and some ebike setups.\u003c\/li\u003e\n  \u003cli\u003eCheck orientation and hole pattern against your existing crank.\u003c\/li\u003e\n  \u003cli\u003eNot universal — confirm compatibility prior to purchase.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow strong and durable are these crank arms?\u003c\/h3\u003e\n\u003cp\u003eThe arms are forged from 6061 aluminum alloy, a common material for performance drivetrain parts, offering high strength and resistance to bending under normal riding loads. Forging increases material density and fatigue resistance compared with simple casting. While robust for intended ebike and bicycle use, correct installation and periodic inspection increase service life.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eForged 6061 alloy for enhanced strength and durability.\u003c\/li\u003e\n  \u003cli\u003eHigh hardness minimizes deformation under load.\u003c\/li\u003e\n  \u003cli\u003eDesigned for ebike torque loads when used as specified.\u003c\/li\u003e\n  \u003cli\u003eRoutine torque checks and inspections recommended.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I install these crank arms and what is included?\u003c\/h3\u003e\n\u003cp\u003eCrank arms come as a left\/right pair clearly marked L and R; installing them on the correct sides is essential. The package includes two crank arms plus crank bolts. Follow your motor or bike manufacturer torque specs and ensure both sides share the same diamond-hole orientation for proper fit and safety.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePackage: left + right crank arms and crank bolts.\u003c\/li\u003e\n  \u003cli\u003eParts labeled L (left) and R (right) for correct installation.\u003c\/li\u003e\n  \u003cli\u003eOne pair intended for ebikes with compatible mid-mounted motors.\u003c\/li\u003e\n  \u003cli\u003eUse correct torque settings and verify alignment during fitment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Riders and maintenance technicians who need a strong, lightweight crank arm solution for ebikes or bikes with a diamond-hole spindle interface. These Alps2Ocean arms suit riders who require specific crank lengths for bike fit, cyclists replacing worn or damaged arms, and ebike builders using compatible mid-mounted motors. Ensure the diamond-hole interface and length match your setup before ordering.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will these crank arms fit any ebike?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: They fit ebikes that use a 12 mm diamond-hole spindle interface; verify your motor or crank matches this shape before buying.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What crank length should I choose?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Shorter lengths (89–127 mm) suit quick cadence and clearance; longer (140–175 mm) increase leverage for climbing or heavy loads.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Alps2Ocean","offers":[{"title":"Default Title","offer_id":59354125893980,"sku":"B0CM8QLYG5","price":45.39,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1059\/5604\/9244\/files\/alps2ocean-front-packaging-crank-arms_dd3a8ad4-71f1-4bf6-a8cc-35fc25959a79.jpg?v=1791147017","url":"https:\/\/sportium.co.uk\/products\/alps2ocean-bike-crank-arms-forged-6061-alloy-diamond-hole-170mm-lightweight-durable-ebike-replacement","provider":"Sportium Sports And Outdoors","version":"1.0","type":"link"}