{"product_id":"spark-exhaust-bent-tube-30-degrees-35mm","title":"Spark Exhaust Bent Tube 30° Ø 35 × 1.0 mm Stainless Steel Universal G9129","description":"\u003cp\u003eThirty-five millimetres through thirty degrees. A shallow bend in the diameter that suits the small twins Spark builds its Force silencers for.\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 35 mm outside, 1.0 mm wall thickness.\u003c\/li\u003e\n\u003cli\u003eStraight tangents at both ends.\u003c\/li\u003e\n\u003cli\u003eMatches Spark's 35 mm straight tube, article G9011.\u003c\/li\u003e\n\u003cli\u003eSpark part number G9129, made in Mantova, Italy.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWall Thinning\u003c\/h2\u003e\u003cp\u003eThe outside of any bend stretches. On a mandrel bend at a sensible radius the wall loses perhaps ten per cent on the outer heel; on a tight bend made badly it can lose a third.\u003c\/p\u003e\u003cp\u003eThat matters because the outer heel is also where the gas scours hardest and where a system usually fails first. Buying the bend rather than making it is the cheapest way to keep the wall where it should be.\u003c\/p\u003e\u003ch2\u003eThe Diameter and Its Silencers\u003c\/h2\u003e\u003cp\u003eThirty-five is the internal bore of Spark's Force db killer for the Yamaha R3 and Kawasaki Ninja 400, and of its Moto GP inserts. It is a small-twin diameter, and a 30° bend in it usually appears in the run between a header and a mid-mounted silencer.\u003c\/p\u003e\u003ch2\u003eShallow Bends and Flow\u003c\/h2\u003e\u003cp\u003eEvery change of direction costs something. A thirty degree bend at a generous radius costs very little — far less than a ninety at the same radius, and less than two forty-fives that add up to the same angle.\u003c\/p\u003e\u003cp\u003eIf a run can be made with shallow bends instead of sharp ones, it should be. The parts cost the same and the engine notices.\u003c\/p\u003e\u003ch2\u003eClocking the Bend\u003c\/h2\u003e\u003cp\u003eA bend has a plane, and rotating it about the tube axis before tacking swings the far end through an arc. On a build with two or three bends in series, that rotation is the whole adjustment — get the clocking right with tape and clamps before any heat goes near it.\u003c\/p\u003e\u003ch2\u003eCutting a Bend Shorter\u003c\/h2\u003e\u003cp\u003eA 30° bend trims down to twenty or fifteen degrees easily, and doing so is normal rather than a compromise. Cut through the curve rather than through the straight tangent: that way the offcut keeps a usable straight end too, which on a build with several corrections is a second bend for free.\u003c\/p\u003e\u003ch2\u003eOrdering\u003c\/h2\u003e\u003cp\u003eOne bend per article. Available in 30°, 45° and 90° at this diameter.\u003c\/p\u003e","brand":"Spark Exhaust","offers":[{"title":"Default Title","offer_id":53618095161610,"sku":"G9129","price":97.0,"currency_code":"ILS","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/6087d19ebf900_1a72e088-ee7b-40ee-ab1b-e5b13342e216.png?v=1788347419","url":"https:\/\/inter-pace.com\/en-il\/products\/spark-exhaust-bent-tube-30-degrees-35mm","provider":"Inter-Pace","version":"1.0","type":"link"}