The facts.
| Part number | G9158 |
|---|---|
| Type | Bent pipe |
| Material | AISI 304 stainless steel |
| Spark weight | 0.2 kg |
| Dimensions | 90°, Ø 70 × 1.2 mm |
| Fitment | Universal |
| Road approval | None — track use only |
| Origin | Made in Italy |
| Manufacturer | Spark Exhaust Technology, Mantova |
| Manufacturer description | Bended tube 90° - d.70 x 1,2mm |
DescriptionThe whole story▼
Seventy millimetres at ninety degrees, in a wall a fifth thicker than the sizes below. A right angle at a diameter where most workshops stop trying.
Key Features
- Mandrel-formed 90° bend, AISI 304 stainless steel.
- Ø 70 mm outside, 1.2 mm wall thickness.
- Thicker wall than the 32 to 60 mm bends.
- Matches Spark's 70 mm straight tube, article G9009.
- Spark part number G9158, made in Mantova, Italy.
A Corner in a Chamber
At seventy millimetres a right angle is not routing gas — it is turning a volume. Pre-silencer boxes, expansion chambers and the large sections of a custom system sometimes have to change direction around a subframe or a shock tower, and there is no way of doing it in less space.
The Hardest Thing in the Range to Form
Large diameter, thin wall, maximum angle. Every factor that makes a tube collapse under a bender is at its worst here, which is why a formed ninety at seventy millimetres is a specialist part rather than something a fabricator produces on the day.
The failure mode is a folded inner heel: the material buckles instead of stretching, the bore is permanently reduced at the turn, and nothing recovers it.
Card Before Cash
With the tangents counted, this bend occupies a cube roughly two hundred millimetres on a side. Cut the outline from stiff card and hold it in place before ordering — on a part this size a drawing is not a substitute for the real footprint.
Fitting to a Flat Face
A box built around this diameter usually meets a plate somewhere: a bulkhead, a mounting face, an end cap. Cutting a large tube to sit square on a flat is a template job rather than an eye job — wrap paper, mark, cut, and check the fit dry before any heat.
Shipping Damage
A large thin bend is the article most likely to arrive dented. Check both tangents with a vernier across two axes when it comes out of the box, before anything is cut — a part that is out of round on arrival is returnable, and worthless once it has been shortened.
Ordering
One bend per article. Spark builds 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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Register your return by email with your order number before sending anything back, and we’ll send you the return instructions. Please note: returns that aren’t registered in advance can’t be accepted.
The quickest way is to place a new order for the size you need and register a return for the original by email — just let us know it’s an exchange.
We’re sorry — that shouldn’t happen. Contact us with your order number and a photo as soon as you can, and we’ll arrange a replacement or refund right away. Faulty goods are always covered by your statutory warranty.
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Our team is happy to help. Use the contact button below and we’ll personally help you choose the right gear or part.
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.
Most of our touring and sport helmets are Pinlock-ready and many include the insert. Check the ‘What’s in the box’ section on this page for this model.
Yes — the cheek pads are channelled so the arms of your glasses slide in comfortably.
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.
Our team will personally help you choose the right gear or part — around 24h for a reply.