Spark Exhaust Bent Tube 30° Ø 38 × 1.0 mm Stainless Steel Universal G9135
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Thirty degrees at thirty-eight millimetres — the shallow bend in the diameter that carries a middleweight twin.
Key Features
- Mandrel-formed 30° bend, AISI 304 stainless steel.
- Ø 38 mm outside, 1.0 mm wall thickness.
- Straight tangents at both ends for cutting and welding.
- Matches Spark's 38 mm straight tube, article G9007.
- Spark part number G9135, made in Mantova, Italy.
The Offset Trick
Two 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.
It is the standard answer to a silencer that sits ten millimetres too far inboard, and it is far quicker than rebuilding the run.
Welding Two Bends Together
Back-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.
Thirty-Eight in Context
A 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.
Cutting Through a Curve
Marking 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.
Freehand marking on a bend is the usual reason a joint arrives with a gap on one side.
Ovality at the Tangent
A 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.
Ordering
One bend per article. Spark makes 30°, 45° and 90° in this size.
| Part number | G9135 |
|---|---|
| Type | Bent pipe |
| Material | AISI 304 stainless steel |
| Spark weight | 0.2 kg |
| Dimensions | 30°, Ø 38 × 1.0 mm |
| Fitment | Universal |
| Road approval | None — track use only |
| Origin | Made in Italy |
| Manufacturer | Spark Exhaust Technology, Mantova |
| Manufacturer description | Bended tube 30° - d.38 x 1,0mm |
Universal product — Please check whether it fits your bike.
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// Spark Exhaust
Spark Exhaust Bent Tube 30° Ø 38 × 1.0 mm Stainless Steel Universal G9135

Tech specs
- Part number
- G9135
- Type
- Bent pipe
- Material
- AISI 304 stainless steel
- Spark weight
- 0.2 kg
- Dimensions
- 30°, Ø 38 × 1.0 mm
- Fitment
- Universal
- Road approval
- None — track use only
- Origin
- Made in Italy
- Manufacturer
- Spark Exhaust Technology, Mantova
- Manufacturer description
- Bended tube 30° - d.38 x 1,0mm
- Worldwide shipping
- Genuine parts & verified quality
- 14-day returns — in stock ships within 24h
- Personal email support
// Support
Frequently asked questions
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