{"id":2036,"date":"2026-01-12T04:00:11","date_gmt":"2026-01-12T07:30:11","guid":{"rendered":"https:\/\/clipclopbike.com\/?p=2036"},"modified":"2026-03-02T03:56:43","modified_gmt":"2026-03-02T07:26:43","slug":"is-a-square-downtube-stronger-than-a-round-tube","status":"publish","type":"post","link":"https:\/\/clipclopbike.com\/da\/is-a-square-downtube-stronger-than-a-round-tube\/","title":{"rendered":"Er et firkantet nedre r\u00f8r virkelig st\u00e6rkere end et rundt r\u00f8r p\u00e5 en elcykel?"},"content":{"rendered":"<p>Jeg er Leo Liang fra ClipClop, og dette sp\u00f8rgsm\u00e5l kommer konstant op: \u201cFirkantet nedre r\u00f8r eller rundt r\u00f8r \u2013 hvad er st\u00e6rkest?\u201d Hvis du k\u00f8ber rammer til et brand, en udlejningsfl\u00e5de eller distribution, s\u00e5 er \u201cst\u00e6rkere\u201d ikke en vibe. Det er f\u00e6rre sprudne svejsninger, f\u00e6rre inddelte r\u00f8r under transport og f\u00e6rre grimme overraskelser efter den f\u00f8rste s\u00e6son.<\/p>\n\n\n\n<p>Det vanskelige er, at en ramme ikke uds\u00e6ttes for \u00e9n type kraft. Den b\u00f8jes, vrides, komprimeres og rystes \u2013 nogle gange alt sammen under samme br\u00e6t-hop. Det \u00e6rlige svar er derfor simpelt: Den \u201cst\u00e6rkere\u201d form afh\u00e6nger af, hvilken retning lasten fors\u00f8ger at deformere r\u00f8ret.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Hvad \u201cSt\u00e6rkere\u201d Virkelig Betyder p\u00e5 en Elcykel<\/h2>\n\n\n\n<p>I rammesprog blander \u201cst\u00e6rk\u201d normalt tre ideer: stivhed (hvor meget den b\u00f8jer), ultimate styrke (hvad den kan ta\u030ale f\u00f8r fejl) og udmattelseslevetid (hvor l\u00e6nge den overlever gentaget stress). To rammer kan begge b\u00e6re en rytter, men den ene f\u00f8les solid i a\u030ar, mens den anden langsomt udvikler knagen og haarrevner.<\/p>\n\n\n\n<p>Elcykler \u00f8ger indsatsen, fordi det nedre r\u00f8r ofte b\u00e6rer batterimassen og sidder t\u00e6t pa\u030a h\u00f8j-torquezoner. Det betyder, at vi bekymrer os om vertikal b\u00f8jning fra huller, torsional vridning fra styring og tra\u030aden, samt langsigtet udmattelse fra tusindvis af vibrationscyklusser i den virkelige verden.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Hvorfor Runde R\u00f8r Stadig Skin ved Torsion<\/h2>\n\n\n\n<p>Et rundt r\u00f8r er den klassiske torsionsmester. Fordi materialet er j\u00e6vnt fordelt omkring centerlinjen, spredes vridningsstressen j\u00e6vnt i stedet for at ophobes ved hj\u00f8rner. I ridningstermer betyder det normalt stabilt h\u00e5ndtering, na\u030ar du sk\u00e6rer i sving, rammer off-camber huller eller sta\u030ar op og sprinter.<\/p>\n\n\n\n<p>Runde profiler opf\u00f8rer sig ogs\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327\u0327.<\/p>\n\n\n\n<p>Riders notice one more thing, even if they never name it: round tubes often feel less \u201csharp.\u201d The flex is more uniform, which can reduce buzz on rough pavement. For folding frames, that symmetry can make hinge clamping more predictable as well, because clamp loads wrap around the tube instead of focusing on flat faces.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Rectangular Downtubes Took Over Battery Integration<\/h2>\n\n\n\n<p>If round tubes are great at resisting twist, rectangular downtubes are great at resisting bending in a chosen direction. Make the section taller (top-to-bottom) and you can boost vertical stiffness dramatically without adding much weight. That\u2019s useful when an integrated 48V 15Ah battery is living inside the downtube like a heavy passenger.<\/p>\n\n\n\n<p>Packaging is the other big driver. A box section provides flatter internal surfaces for battery rails, latches, seals, and shock pads, and it leaves tidy space for internal cable routing. The end result is usually a cleaner look, less rattling, and easier service access\u2014especially important for fleets.<\/p>\n\n\n\n<p>At the joints, a rectangular section can offer a wider welding land near the head tube and bottom bracket. That doesn\u2019t magically \u201csolve\u201d fatigue, but it gives engineers room to spread loads and shape transitions. For cargo frames and step-thru designs\u2014where the downtube has to do more of the triangle\u2019s job\u2014oversized rectangular profiles are often the practical answer.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The Trade-Offs of \u201cSquare\u201d: Buckling and Cutout Design<\/h2>\n\n\n\n<p>A boxy tube isn\u2019t automatically better. Flat walls can \u201coil-can\u201d or buckle locally if they\u2019re too thin, and tight corners can concentrate stress. Add a large battery door and you\u2019ve introduced a weak ring around the opening unless the area is reinforced intelligently.<\/p>\n\n\n\n<p>Good frames solve this with generous corner radii, internal ribs, and variable wall thickness (butting). They keep material thicker near weld zones, thinner in the mid-span, and they smooth geometry changes so loads don\u2019t spike at one abrupt step. When people say \u201csquare is stronger,\u201d what they usually mean is \u201ca well-engineered box section is strong for this particular job.\u201d<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Hydroforming: The Quiet Hybrid Winner<\/h2>\n\n\n\n<p>If we\u2019re being realistic, the best answer in 2026 is often \u201cneither pure round nor pure square.\u201d Hydroforming lets the cross-section change along the tube. You can keep a more rounded profile near the head tube for torsional stability, then transition into a wider, more rectangular shape near the bottom bracket for battery volume and bending stiffness.<\/p>\n\n\n\n<p>This approach can reduce the need for heavy gussets, because the tube itself becomes the reinforcement. It also helps avoid ugly stress risers: instead of welding on extra plates, you build strength into the tube\u2019s shape and transitions. When it\u2019s executed well, the frame feels stiff where you want precision and a touch more forgiving where you want comfort, without ballooning weight.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">6061 vs 7005: Shape Helps, but Process Decides<\/h2>\n\n\n\n<p>Most ClipClop platforms use 6061 because it welds reliably and performs well after proper T6 heat treatment. You\u2019ll see 7005 promoted as \u201cstronger\u201d on paper, and it can be, but it\u2019s also less forgiving if welding and post-process control aren\u2019t tight. In production, consistency beats theoretical numbers almost every time.<\/p>\n\n\n\n<p>A clean 6061 weld with correct post-weld treatment will outlast a sloppy 7005 weld, regardless of tube shape, especially over years of vibration. If you\u2019re comparing suppliers, ask about weld penetration standards, alignment checks after welding, and how heat treatment and finishing are managed so the joints don\u2019t become the weak link.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">B2B Reality Check: Shipping Damage, Maintenance, and Downtime<\/h2>\n\n\n\n<p>Here\u2019s the unglamorous side: many frames \u201cfail\u201d before they ever see a trail because they get dented in containers or crushed on racks. Rectangular downtubes can resist certain side knocks better in practice, partly because the geometry behaves like a protective shell around the battery cavity.<\/p>\n\n\n\n<p>Maintenance matters just as much. Integrated batteries require doors, locks, wiring paths, and seals, and every opening is a structural compromise if it\u2019s not reinforced. A well-designed box section can stay stiff even with a large service hatch, which is a huge deal for rental fleets and delivery operators who hate downtime.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">So\u2026Which One Is Stronger?<\/h2>\n\n\n\n<p>If your biggest worry is torsional stability and predictable steering, round (or near-round) sections have a natural advantage. If your biggest worry is vertical bending, battery integration, and joint packaging, a rectangular downtube is often the smarter structure.<\/p>\n\n\n\n<p>Most premium frames blend both ideas. The winning frame is usually the one that puts the right shape in the right place, then backs it up with controlled wall thickness, good welding, and correct heat treatment.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">A Buyer Checklist I\u2019d Use (Yes, Even as me)<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ask for wall thickness at the head tube and at the motor\/bottom-bracket zone, not just an \u201caverage thickness\u201d claim.<\/li>\n\n\n\n<li>Look at how the battery door opening is reinforced, and what the sealing strategy is for water, dust, and vibration.<\/li>\n\n\n\n<li>Confirm the alignment tolerances after welding and how each production batch is actually measured, recorded, and audited.<\/li>\n\n\n\n<li>Request fatigue and impact test results for the exact frame platform you\u2019re ordering, not a cousin frame from last year.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Closing Thought<\/h2>\n\n\n\n<p>The square-vs-round debate is fun, but it\u2019s not the real separator. The separator is engineering intent plus manufacturing discipline. At ClipClop, our job is to match geometry to loads, then build it consistently enough that the 500th frame rides like the first\u2014and keeps riding long after the launch hype is gone. That\u2019s the part customers remember.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">FAQ: Common Questions About E-Bike Frame Strength<\/h3>\n\n\n\n<p><strong>Q1: Is a square tube frame heavier than a round one?<\/strong> A: Not necessarily. While a square tube uses more material for the same \u201cdiameter,\u201d a <strong>hydroformed e-bike frame<\/strong> allows us to thin out the walls in non-critical areas, making a <strong>lightweight electric bike frame<\/strong> that is still exceptionally strong.<\/p>\n\n\n\n<p><strong>Q2: Can I put a mid-drive motor on a round tube frame?<\/strong> A: Yes, but a <strong>mid-drive motor frame<\/strong> is often more stable when using a square or shaped downtube. The flat surfaces provide a better \u201cinterface\u201d for the motor\u2019s high-torque mounting points.<\/p>\n\n\n\n<p><strong>Q3: Why does ClipClop use 6061 aluminum instead of carbon fiber?<\/strong> A: For B2B and commercial applications, <strong>er aluminiumslegering 6061<\/strong> offers the best balance of cost, durability, and impact resistance. Carbon fiber is lighter but much more susceptible to \u201chidden\u201d damage from impacts, which is a risk for rental and off-road fleets.<\/p>\n\n\n\n<p><strong>Q4: Does the shape of the downtube affect the battery life?<\/strong> A: Indirectly. A <strong>square tube bike frame<\/strong> allows for an <strong>integrated battery downtube<\/strong> that protects the cells from physical damage and extreme temperatures, which helps maintain the battery\u2019s health and the bike\u2019s <strong>60\u201380KM range<\/strong> over time.<\/p>\n\n\n\n<p><strong>Q5: Are square frames better for fat tire bikes?<\/strong> A: Yes. A <strong>fat tire e-bike frame<\/strong> needs extreme lateral stiffness to handle the weight and grip of <strong>20*4.0 d\u00e6k<\/strong>. The wider cross-section of a rectangular tube provides that necessary rigidity.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">References<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.sciencedirect.com\/topics\/engineering\/bicycle-frames&amp;authuser=2\" target=\"_blank\" rel=\"noreferrer noopener\">Structural Engineering of Bicycle Frames \u2013 ScienceDirect<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.asminternational.org\" target=\"_blank\" rel=\"noreferrer noopener\">Aluminum 6061 Properties and Applications \u2013 ASM International<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.electricbikereport.com\" target=\"_blank\" rel=\"noreferrer noopener\">Udviklingen af e-bike-integration \u2013 Elcykelrapport<\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>I\u2019m Leo Liang at ClipClop, and this question comes up constantly: \u201cSquare downtube or round tube\u2014what\u2019s stronger?\u201d If you\u2019re buying frames for a brand, a rental fleet, or distribution, \u201cstronger\u201d isn\u2019t a vibe. It\u2019s fewer cracked welds, fewer dented tubes in shipping, and fewer ugly surprises after the first season. The tricky part is that [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2037,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_surecart_dashboard_logo_width":"180px","_surecart_dashboard_show_logo":true,"_surecart_dashboard_navigation_orders":true,"_surecart_dashboard_navigation_invoices":true,"_surecart_dashboard_navigation_subscriptions":true,"_surecart_dashboard_navigation_downloads":true,"_surecart_dashboard_navigation_billing":true,"_surecart_dashboard_navigation_account":true,"footnotes":""},"categories":[1],"tags":[197,198],"class_list":["post-2036","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-electric-bike-downtube","tag-square-tube-bike-frame"],"acf":[],"_links":{"self":[{"href":"https:\/\/clipclopbike.com\/da\/wp-json\/wp\/v2\/posts\/2036","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/clipclopbike.com\/da\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/clipclopbike.com\/da\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/clipclopbike.com\/da\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/clipclopbike.com\/da\/wp-json\/wp\/v2\/comments?post=2036"}],"version-history":[{"count":0,"href":"https:\/\/clipclopbike.com\/da\/wp-json\/wp\/v2\/posts\/2036\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/clipclopbike.com\/da\/wp-json\/wp\/v2\/media\/2037"}],"wp:attachment":[{"href":"https:\/\/clipclopbike.com\/da\/wp-json\/wp\/v2\/media?parent=2036"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/clipclopbike.com\/da\/wp-json\/wp\/v2\/categories?post=2036"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/clipclopbike.com\/da\/wp-json\/wp\/v2\/tags?post=2036"}],"curies":[{"name":"WordPress","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}