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Description

AST Bolt-in Roll Cage Nissan Silvia S15 Coupé V4

The Bolt-in S15 Coupé V4 is a full roll cage from AST Roll Cages for the two-door Nissan Silvia S15 and the highest specification level in the bolt-in range for this car.

On top of the door bars of the V3, there is an extra diagonal brace in the main hoop and a harness bar behind the seats. That diagonal keeps the main hoop in shape in a rollover. The harness bar solves the problem many S15 builders run into: shoulder straps that cannot be anchored anywhere at the correct angle because the original mounting points are too low.

The rear structure has a V design. The cage is supplied unpainted.

Key benefits

• Harness bar behind the seats for the correct belt angle
• Extra diagonal brace in the main hoop to prevent deformation in a rollover
• Door bars in both doors, carried over from the V3
• V design rear structure
• Anchorage in the rear suspension area
• FIA connecting sleeves, so the cage remains removable
• E355 steel, 45 mm main hoop and 40 mm secondary structure

Suitable for

Nissan Silvia S15, two-door Coupé

• S15 Spec-R and Spec-S, rear-wheel drive
• Roofs without a sunroof
• Roofs without headlining
• Drifting, track days and competition use

Technical specifications

• Manufacturer: AST Roll Cages
• Part number: CMBN05448
• Material: E355 steel
• Main hoop tube diameter: 45 mm
• Secondary structure tube diameter: 40 mm
• Foot and reinforcement plates: 3 mm steel, custom-made for each car
• Mounting: 6 bolting points on 6 foot plates welded to the bodyshell
• Construction: divided into sections via FIA connecting sleeves
• Weight: 210 kg
• Finish: unpainted
• Sunroof: for roofs without a sunroof
• Headlining: for roofs without headlining
• Rear anchorage: in the rear suspension area
• Rear structure layout: V design
• Included: welded structure, connecting sleeves, reinforcement plates, bolts, washers, nuts, documentation, fitting instructions and sticker set

Fitting and delivery

Trial-fit the bucket seats in position before the harness bar is permanently fixed. The height of that bar determines the angle of your shoulder straps, and it must stay within your harness manufacturer’s specifications. The six foot plates are welded to the bodyshell; the cage is then bolted in place.

Each cage is custom-built after you order. The delivery time is 15 to 35 working days.

Everything the bolt-in range has to offer, in one package, and it still comes back out with a spanner.

Why choose this Bolt-in S15 Coupé V4?

This is the version for an S15 that competes seriously but whose owner does not want to commit the bodyshell permanently. You get the complete set of bars including the harness bar, anchored at the point where the rear axle pushes, and thanks to the FIA connecting sleeves you keep the option of dismantling the structure later. In practice, this is the most substantial cage you can fit in an S15 without needing an angle grinder to get it back out.

Frequently asked questions

Is this a half or a full roll cage?

A full roll cage, bolted in at six points and extending into the front compartment.

What does V4 add compared with V3?

The Bolt-in S15 Coupé V4 has an extra diagonal brace and a harness bar behind the seats. The V3 does not.

Can I attach my shoulder straps to the harness bar?

Yes, that is what the bar is for. Set the seating position first, so that the angle matches what your harness manufacturer specifies.

Is any welding involved?

Yes, for the six foot plates. These are welded to the bodyshell; only the cage itself is bolted.

Is this roll cage homologated?

AST does not state an FIA homologation number for this item. The cage is intended for track and competition use; check the regulations of your own organiser.

Delivery outside the European Union: different shipping costs may apply. Don’t worry: we will email you as soon as possible after your order and agree the shipping with you. You are not committed to anything without your consent.