{"product_id":"spark-exhaust-bent-tube-30-degrees-38mm","title":"Spark Exhaust Bent Tube 30° Ø 38 × 1.0 mm Stainless Steel Universal G9135","description":"\u003cp\u003eThirty degrees at thirty-eight millimetres — the shallow bend in the diameter that carries a middleweight twin.\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 38 mm outside, 1.0 mm wall thickness.\u003c\/li\u003e\n\u003cli\u003eStraight tangents at both ends for cutting and welding.\u003c\/li\u003e\n\u003cli\u003eMatches Spark's 38 mm straight tube, article G9007.\u003c\/li\u003e\n\u003cli\u003eSpark part number G9135, made in Mantova, Italy.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eThe Offset Trick\u003c\/h2\u003e\u003cp\u003eTwo 30° bends welded back to back with a short straight between them shift a run sideways while leaving it pointing the same way. The amount of offset is set by the length of that straight, so a single pair of bends covers a wide range of corrections.\u003c\/p\u003e\u003cp\u003eIt is the standard answer to a silencer that sits ten millimetres too far inboard, and it is far quicker than rebuilding the run.\u003c\/p\u003e\u003ch2\u003eWelding Two Bends Together\u003c\/h2\u003e\u003cp\u003eBack-to-back bends are the joint most likely to come out crooked, because there is no long straight to sight along. Tack at four points, then hold the assembly up against the motorcycle before welding — a degree of error here becomes a centimetre at the silencer.\u003c\/p\u003e\u003ch2\u003eThirty-Eight in Context\u003c\/h2\u003e\u003cp\u003eA common header size on parallel twins from 650 to 900 cc, and the internal bore of the Grid-O insert Spark supplies with its MT-07 and XSR700 systems. If you are building around that platform, this is the diameter the factory parts speak.\u003c\/p\u003e\u003ch2\u003eCutting Through a Curve\u003c\/h2\u003e\u003cp\u003eMarking a square cut on a curved section is genuinely awkward. Wrap a strip of paper round the tube, align the overlapping edges and mark along it — the paper follows the ellipse the saw needs to follow.\u003c\/p\u003e\u003cp\u003eFreehand marking on a bend is the usual reason a joint arrives with a gap on one side.\u003c\/p\u003e\u003ch2\u003eOvality at the Tangent\u003c\/h2\u003e\u003cp\u003eA bend is least round exactly where the curve meets the straight. On a mandrel-formed piece the deviation is small, but it is enough to bind a tight slip joint. Measure the end across two axes with a vernier before assuming a sleeve will slide on, and round it on a mandrel if it needs it.\u003c\/p\u003e\u003ch2\u003eOrdering\u003c\/h2\u003e\u003cp\u003eOne bend per article. Spark makes 30°, 45° and 90° in this size.\u003c\/p\u003e","brand":"Spark Exhaust","offers":[{"title":"Default Title","offer_id":53618095489290,"sku":"G9135","price":54.34,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/6087d39c5a681_0510401c-c7c8-4226-9d77-123c948a565e.png?v=1788347427","url":"https:\/\/inter-pace.com\/en-nz\/products\/spark-exhaust-bent-tube-30-degrees-38mm","provider":"Inter-Pace","version":"1.0","type":"link"}