{"product_id":"darimo-sigma-carbon-cranks","title":"Darimo - Sigma Carbon Cranks","description":"\u003cstyle\u003e\n.bsv-sigma{font-size:15px;line-height:1.5;color:inherit}\n.bsv-sigma p{margin:0 0 12px}\n.bsv-sigma h2{font-size:19px;line-height:1.3;margin:22px 0 9px}\n.bsv-sigma .sigma-highlights{margin:14px 0 18px}\n.bsv-sigma .sigma-highlights p{margin:0 0 5px;font-size:15px;line-height:1.4}\n.bsv-sigma .sigma-specs{font-size:14px;line-height:1.6;margin-bottom:16px}\n.bsv-sigma .sigma-version{font-size:14px;margin:0 0 9px}\n.bsv-sigma .sigma-note{font-size:13px;line-height:1.45}\n.bsv-sigma .sigma-faq details{background:#f5f5f5;border:1px solid #e6e6e6;border-radius:6px;margin:0 0 8px;padding:0;overflow:hidden}\n.bsv-sigma .sigma-faq summary{display:list-item;cursor:pointer;padding:12px 14px;font-size:15px;font-weight:600;line-height:1.4;list-style-position:inside}\n.bsv-sigma .sigma-faq summary::marker{color:#666;font-size:12px}\n.bsv-sigma .sigma-faq details[open] summary{border-bottom:1px solid #e2e2e2}\n.bsv-sigma .sigma-answer{padding:11px 14px;background:#fafafa}\n.bsv-sigma .sigma-answer p{font-size:14px;line-height:1.5;margin:0}\n\u003c\/style\u003e\n\n\u003cdiv class=\"bsv-sigma\"\u003e\n\n\u003cp\u003e\u003cstrong\u003eYour next weight saving is at the heart of your bike.\u003c\/strong\u003e Darimo Sigma carbon cranks start at just \u003cstrong\u003e240g for both arms, spindle, fixing bolt and preload adjuster\u003c\/strong\u003e. Handmade in Spain for road, gravel and MTB, they bring Darimo’s obsessive carbon engineering to your drivetrain.\u003c\/p\u003e\n\n\u003cdiv class=\"sigma-highlights\"\u003e\n\u003cp\u003e\u003cstrong\u003eTake your build lighter:\u003c\/strong\u003e crank assemblies from just 240g\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKeep power measurement:\u003c\/strong\u003e accepts compatible 8-bolt spider-based power meters\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePreserve your preferred fit:\u003c\/strong\u003e five lengths, with mixed arm lengths at no extra cost\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGet extra support without extra cost:\u003c\/strong\u003e free reinforcement for heavier riders or greater stiffness\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eA build you’ll be proud to pick up\u003c\/h2\u003e\n\n\u003cp\u003eThere’s satisfaction in lifting your bike and knowing where the weight has gone. Sigma brings that attention to the centre of your build, with hollow carbon arms, a hollow carbon spindle and six finishes to make it your own.\u003c\/p\u003e\n\n\u003cp\u003eThe left arm and spindle are laminated as \u003cstrong\u003eone continuous carbon piece\u003c\/strong\u003e. There is no bonded joint between them: the fibres run directly from the spindle into the arm to carry the pedalling loads.\u003c\/p\u003e\n\n\u003cp\u003eEach crank length has its own optimised laminate, combining unidirectional and braided carbon. Sigma exceeds \u003cstrong\u003eISO 4210 test requirements\u003c\/strong\u003e, backing its exceptionally low weight with structural testing.\u003c\/p\u003e\n\n\u003ch2\u003eYour drivetrain. With more Darimo.\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003e8-bolt direct-mount interface\u003c\/strong\u003e supports single and double chainring setups using direct-mount rings or an 8-bolt spider. It also accepts compatible spider-based power meters, so a lightweight build can still have the training data you rely on.\u003c\/p\u003e\n\n\u003cp\u003eFour spindle configurations accommodate road, gravel and mountain bike frames, with Q-factor starting at 148mm. A fine preload adjuster sets bearing preload for smooth rotation without lateral play.\u003c\/p\u003e\n\n\u003ch2\u003eFeatured on a Dangerholm custom build\u003c\/h2\u003e\n\n\u003cp\u003eGustav Gullholm, known as \u003cstrong\u003eDangerholm\u003c\/strong\u003e, is a custom bike builder recognised for extreme lightweight projects. Sigma cranks featured on his custom Scott Scale RC SL gravel build.\u003c\/p\u003e\n\n\u003cp\u003e\u003ca href=\"https:\/\/bikerumor.com\/new-darimo-280g-carbon-crank-dangerholm-bike-34-ultralight-aero-seatpost-fits-more\/\" target=\"_blank\" rel=\"noopener\"\u003eSee the Sigma-equipped Scott in BikeRumor’s coverage.\u003c\/a\u003e\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\n\u003cdiv class=\"sigma-specs\"\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e Hollow carbon arms and spindle\u003cbr\u003e\n\u003cstrong\u003eDesign:\u003c\/strong\u003e One-piece left arm and spindle, without a bonded joint\u003cbr\u003e\n\u003cstrong\u003eSpindle diameter:\u003c\/strong\u003e 28.99mm, DUB-compatible\u003cbr\u003e\n\u003cstrong\u003eCrank lengths:\u003c\/strong\u003e 155, 160, 165, 170 and 172.5mm\u003cbr\u003e\n\u003cstrong\u003eMixed arm lengths:\u003c\/strong\u003e Available at no extra cost\u003cbr\u003e\n\u003cstrong\u003eInterface:\u003c\/strong\u003e 8-bolt direct mount for single or double chainring setups\u003cbr\u003e\n\u003cstrong\u003ePreload:\u003c\/strong\u003e Millimetric preload adjuster\u003cbr\u003e\n\u003cstrong\u003eStandard rider weight limit:\u003c\/strong\u003e 90kg, with free reinforcement available\u003cbr\u003e\n\u003cstrong\u003eTesting:\u003c\/strong\u003e Exceeds ISO 4210 requirements\u003cbr\u003e\n\u003cstrong\u003eFinishes:\u003c\/strong\u003e 3K Gloss, 3K Matte, UD Gloss, UD Matte, Forged Gloss and Forged Matte\u003cbr\u003e\n\u003cstrong\u003eManufacture:\u003c\/strong\u003e Handmade in Llíria, Valencia, Spain\n\u003c\/div\u003e\n\n\u003ch2\u003eSpindle options\u003c\/h2\u003e\n\n\u003cp class=\"sigma-version\"\u003e\u003cstrong\u003eRoad: 240g\u003c\/strong\u003e\u003cbr\u003e\n148mm Q-factor · 44.75mm chainline\u003c\/p\u003e\n\n\u003cp class=\"sigma-version\"\u003e\u003cstrong\u003eRoad-Wide \/ Gravel: 240g\u003c\/strong\u003e\u003cbr\u003e\n153mm Q-factor · 47.25mm chainline\u003c\/p\u003e\n\n\u003cp class=\"sigma-version\"\u003e\u003cstrong\u003eMTB: 260g\u003c\/strong\u003e\u003cbr\u003e\n163mm Q-factor · 51.5mm chainline\u003c\/p\u003e\n\n\u003cp class=\"sigma-version\"\u003e\u003cstrong\u003eMTB Wide: 260g\u003c\/strong\u003e\u003cbr\u003e\n169mm Q-factor · 54.5mm chainline\u003c\/p\u003e\n\n\u003cp class=\"sigma-note\"\u003ePublished weights use 165mm arms and include spindle, fixing bolt and preload adjuster. Excludes chainrings, spider or power meter, and bottom bracket.\u003c\/p\u003e\n\n\u003cp class=\"sigma-note\"\u003eChainlines shown use a 6.5mm-offset chainring for Road\/Road-Wide and a 3mm-offset chainring for MTB versions. Chainline varies with chainring offset. Q-factor is the width between the outer faces of the crank arms at the pedal threads.\u003c\/p\u003e\n\n\u003cp class=\"sigma-note\"\u003eDarimo does not apply clear coat or varnish. Small surface voids can be visible as part of the carbon manufacturing finish.\u003c\/p\u003e\n\n\u003ch2\u003eFAQs\u003c\/h2\u003e\n\n\u003cdiv class=\"sigma-faq\"\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow much weight will I save?\u003c\/summary\u003e\n\u003cdiv class=\"sigma-answer\"\u003e\n\u003cp\u003eRoad and Road-Wide versions weigh 240g with 165mm arms. MTB versions weigh 260g. Compare that with your existing arms, spindle and fixing hardware to calculate the saving. Chainrings, power meter and bottom bracket are accounted for separately.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use Sigma with Shimano or SRAM gears?\u003c\/summary\u003e\n\u003cdiv class=\"sigma-answer\"\u003e\n\u003cp\u003eYes. You can retain your Shimano or SRAM gears and configure Sigma with chainrings selected for that drivetrain. The 8-bolt mounting interface supports both single and double chainring setups.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use my existing chainrings or power meter?\u003c\/summary\u003e\n\u003cdiv class=\"sigma-answer\"\u003e\n\u003cp\u003eSigma accepts 8-bolt direct-mount single chainrings, 8-bolt spiders and compatible spider-based power meters. Existing chainrings can be retained when they fit a suitable 8-bolt spider and match the drivetrain. Shimano chainrings do not attach directly to the Sigma arm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWill I need a different bottom bracket?\u003c\/summary\u003e\n\u003cdiv class=\"sigma-answer\"\u003e\n\u003cp\u003eIf your bike has a Shimano 24mm bottom bracket, it will need a DUB-compatible bottom bracket for Sigma’s 28.99mm spindle. This is a normal component replacement using a bottom bracket suited to your frame. If you already use DUB, a replacement may not be necessary.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I retain my current crank length?\u003c\/summary\u003e\n\u003cdiv class=\"sigma-answer\"\u003e\n\u003cp\u003eYes, if you currently use 155, 160, 165, 170 or 172.5mm cranks. Select the matching length to retain that part of your fit. Darimo also offers different left and right arm lengths at no extra cost for riders with a mixed-length fit prescription.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan riders over 90kg use Sigma?\u003c\/summary\u003e\n\u003cdiv class=\"sigma-answer\"\u003e\n\u003cp\u003eYes. Darimo offers reinforcement at no extra cost for riders over the standard 90kg limit. Include your rider weight and reinforcement request in your order notes. Riders under 90kg can also request reinforcement for a stiffer version.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003c\/div\u003e\n\n\u003cp style=\"margin-top:20px;\"\u003e\u003cstrong\u003eLess weight. 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