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Description

AST Multipoint Weld-in Roll Cage BMW E81 V4

The AST Multipoint Weld-in Roll Cage BMW E81 V4 is a full roll cage for the BMW 1 Series E81 with three-door hatchback bodywork. This multipoint E81 V4 is welded to the bodyshell at ten points instead of eight, spreading the load over more areas of the body.

The cage is designed and built by AST Roll Cages in Spain, for drivers who are building an E81 into a serious track or drift car and want to spread the forces as widely as possible.

Key benefits

• Ten welded mounting points: two more attachment points than the standard weld-in cage, for wider load distribution.
• Diagonal bar and harness bar: the V4 specification, with a fixed mounting point for the shoulder straps.
• Door bars: side protection in both doors.
• Permanent connection: welded, so there is no play in the joints.
• E355 steel: main hoop with a diameter of 45 mm, the remaining tubes 40 mm.
• Gussets and reinforcement plates: supplied to support every welded mounting point in the bodyshell.
• Unpainted weld-in kit: fitting, welding and painting in a single process.

Suitable for

BMW 1 Series E81, three-door hatchback

• BMW 1 Series E81 three-door hatchback, model years 2007 to 2011
• Type: full roll cage, version V4, multipoint weld-in (permanent)
• Drifting, track use and rallying
• Only for the three-door E81. AST designs a separate cage for each body style, so the versions for the E82 coupé and the five-door E87 are not interchangeable with this one.

Technical specifications

• Manufacturer: AST Roll Cages
• Manufacturer part number: CMBN02840
• Sunroof: for roofs without a sunroof
• Headlining: for roofs without headlining
• Rear anchorage: in the rear suspension area
• Rear structure layout: V design
• Type: full roll cage, multipoint weld-in (permanent)
• Main hoop: E355 steel, 45 mm diameter
• Secondary structure: E355 steel, 40 mm diameter
• Foot plates: 3 mm steel, custom-designed for each car
• Mounting: 10 welded mounting points on the bodyshell
• Weight: 71 kg (manufacturer’s figure)
• Finish: unpainted weld-in kit
• Included: weld-in kit, gussets, reinforcement plates, bolts, washers and nuts, documentation, fitting instructions and sticker set

Fitting and delivery

The cage is built to order; the standard delivery time is 15 to 35 working days. Ten welded mounting points also means ten areas that need to be properly prepared and supported, so have the cage fitted by a workshop with roll cage experience. AST digitises the bodyshell with laser scanners and designs the cage in 3D, so that it fits your car exactly.

Ten welded mounting points instead of eight: the forces are spread over more areas of the E81’s bodyshell.

Why choose this multipoint E81 V4?

The more attachment points a cage has, the less each point has to absorb, and in the long run that makes a difference to the bodyshell of a car that takes a lot of punishment. For an E81 that regularly does drift days or races, it is the difference between a cage that lasts and a bodyshell that starts to show fatigue. The cage is intended for track and competition use; always check the regulations of your own organiser before you enter.

Frequently asked questions

What makes this a multipoint cage?

The multipoint E81 V4 has ten welded mounting points on the bodyshell, whereas the standard weld-in version has eight. The extra points spread the load over more areas of the body.

What is included in the kit?

You receive the weld-in kit, the gussets and reinforcement plates, the bolts, washers and nuts, the documentation, fitting instructions and a sticker set. The cage is unpainted.

What is the delivery time?

The standard delivery time for this roll cage is 15 to 35 working days.

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.