The facts.
| Part number | G9107 |
|---|---|
| Type | Bent pipe |
| Material | AISI 304 stainless steel |
| Spark weight | 0.2 kg |
| Dimensions | 30°, Ø 54 × 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.54 x 1,0mm |
DescriptionThe whole story▼
Fifty-four millimetres through thirty degrees. A collector-section diameter, in the angle that reconciles two fixed points at either end of a long run.
Key Features
- Mandrel-formed 30° bend, AISI 304 stainless steel.
- Ø 54 mm outside, 1.0 mm wall thickness.
- Straight tangents at both ends for cutting and welding.
- Matches Spark's 54 mm straight tube, article G9003.
- Spark part number G9107, made in Mantova, Italy.
Two Fixed Points and a Bend Between Them
On a four-cylinder build almost nothing about the exhaust is free. The collector leaves the engine where the header geometry puts it; the silencer has to arrive at a mount the frame decides. Everything between is the fabricator's problem, and a shallow bend is the tool for it.
Thirty degrees changes direction little enough that the run still reads as a straight line and enough to move the far end by a useful amount over half a metre.
Angle Against Length
The further the silencer is from the bend, the more a small angle moves it. A thirty degree deviation displaces the end of a 400 mm run by around two hundred millimetres — which is why a shallow bend early in a system has more effect than a sharp one late in it.
Put the correction where it does the most work and the system needs fewer pieces.
Growth in a Long Run
Stainless expands about seventeen microns per metre per degree. A metre of pipe going from cold to five hundred degrees grows more than eight millimetres, and a bend is where that growth turns into a bending load rather than a sliding one.
One sliding joint per run absorbs it. A system welded solid at both ends cracks at a tangent weld, usually within a season.
Where the Mount Goes
Not on the curve. A bracket welded to the outside of a bend puts a hard point on the part of the tube that is already thinnest and most stressed. Weld the tab to a straight section and let the bend float.
Clamping It
Only on the tangents, and only with soft jaws. Fifty-four millimetres of one millimetre wall takes a permanent set from bare vice jaws in seconds, and an oval end is what stops the next joint going together.
Ordering
One bend per article. Available in 30°, 45° and 90° at this diameter.
FitmentWhich bikes this fits▼
Universal product — Please check whether it fits your bike.
Questions, one topic at a time.
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Measure your head circumference about one centimetre above your eyebrows and compare it with the size chart on this page. Between sizes? Choose the smaller one — the padding beds in with use.
Yes — it’s tested and approved to the current ECE 22.06 standard and road-legal across the EU.
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Take out the washable lining and hand-wash it in lukewarm water. Clean the shell and visor with a soft cloth and water only — never solvents.
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