{"product_id":"spark-exhaust-bent-tube-30-degrees-70mm","title":"Spark Exhaust Bent Tube 30° Ø 70 × 1.2 mm Stainless Steel Universal G9156","description":"\u003cp\u003eSeventy millimetres at thirty degrees. A bend at the scale where a tube has stopped being a pipe, with the wall stepped up to suit.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eMandrel-formed 30° bend, AISI 304 stainless steel.\u003c\/li\u003e\n\u003cli\u003eØ 70 mm outside, 1.2 mm wall thickness.\u003c\/li\u003e\n\u003cli\u003eThicker wall than the 32 to 60 mm bends.\u003c\/li\u003e\n\u003cli\u003eMatches Spark's 70 mm straight tube, article G9009.\u003c\/li\u003e\n\u003cli\u003eSpark part number G9156, made in Mantova, Italy.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eShaping a Volume\u003c\/h2\u003e\u003cp\u003eAt seventy millimetres a shallow bend is rarely routing gas. It is giving a silencer body or a pre-silencer box a curve so that the assembly follows the line of a frame rail or a swingarm instead of cutting across it.\u003c\/p\u003e\u003cp\u003eThirty degrees is the angle that does that without making the shell a difficult shape to close at both ends — anything sharper and the end caps stop being flat discs.\u003c\/p\u003e\u003ch2\u003eTooling, and Why You Cannot Borrow It\u003c\/h2\u003e\u003cp\u003eForming this diameter needs a mandrel sized to the bore, a die matched to the radius and a machine with the capacity to pull it. That is a set of tooling per diameter, per radius — the reason a workshop that bends forty millimetre tube every week still buys its seventies.\u003c\/p\u003e\u003ch2\u003eWhat Goes Wrong Without It\u003c\/h2\u003e\u003cp\u003eThe inner heel folds. Once a large thin tube has creased on the inside of a radius there is no dressing it out: the material has buckled rather than stretched, and the section is permanently smaller at exactly the point the gas has to turn.\u003c\/p\u003e\u003ch2\u003eFitting to a Flat\u003c\/h2\u003e\u003cp\u003eA box built from this diameter usually meets a flat plate somewhere — a mounting face, a bulkhead, an end cap. Cutting a large tube to sit square on a flat is easier with a template than by eye: wrap paper, mark, cut, and check the fit before any heat.\u003c\/p\u003e\u003ch2\u003eHeat Input\u003c\/h2\u003e\u003cp\u003e1.2 mm takes more heat than 1.0 and takes longer to get there. Settings carried over from the smaller diameters produce a cold bead that sits on the surface rather than fusing — visible as a raised, shiny line that has not wetted into the parent metal at the edges.\u003c\/p\u003e\u003ch2\u003eStorage Before Use\u003c\/h2\u003e\u003cp\u003eA large thin bend is easy to damage in a workshop. Keep it off concrete, keep it away from grinding work, and cap the ends: embedded steel dust from an angle grinder is what makes stainless rust in spots.\u003c\/p\u003e\u003ch2\u003eOrdering\u003c\/h2\u003e\u003cp\u003eOne bend per article. Spark builds 30°, 45° and 90° at this diameter.\u003c\/p\u003e","brand":"Spark Exhaust","offers":[{"title":"Default Title","offer_id":53618102862090,"sku":"G9156","price":48.11,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/6087e2b69c5a4_8ad83168-6a70-4f2b-8030-8ff7eab9b67f.png?v=1788354235","url":"https:\/\/inter-pace.com\/en-ca\/products\/spark-exhaust-bent-tube-30-degrees-70mm","provider":"Inter-Pace","version":"1.0","type":"link"}