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Description

AST Multipoint Weld-in Roll Cage BMW E81 V4 NASCAR door

The AST Multipoint Weld-in Roll Cage BMW E81 V4 NASCAR Door Bars is a full roll cage for the BMW 1 Series E81 with three-door hatchback bodywork. This multipoint E81 V4 NASCAR combines ten welded mounting points on the bodyshell with the V4 specification level and curved NASCAR tubes in both doors.

The cage is designed and built by AST Roll Cages in Spain, for drivers who are turning their E81 into a fully fledged competition car and want the very best in both load distribution and side protection.

Key benefits

• Ten welded mounting points: the widest load distribution across the bodyshell that AST offers for this model.
• NASCAR door bars: several curved tubes per door instead of the standard door bar.
• Diagonal brace and harness bar: V4 level, with a fixed anchor point for the shoulder straps.
• Entry remains practical: the curvature of the door tubes leaves room to get in and out with a harness on.
• E355 steel: main hoop with a diameter of 45 mm, the remaining tubes 40 mm.
• Gussets and reinforcement plates: included to support all ten welded mounting points.
• 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 with NASCAR door bars, multipoint weld-in (permanent)
• Drifting, track use and rallying
• Exclusively 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 do not fit this car.

Technical specifications

• Manufacturer: AST Roll Cages
• Manufacturer part number: CMBN03611
• 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), with NASCAR door bars
• 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. With ten welded mounting points and curved door tubes, this is the most labour-intensive version in the multipoint range, so allow plenty of workshop time. AST digitises the bodyshell with laser scanners and designs the cage in 3D, so that it fits your car exactly.

Ten welded mounting points, harness bar and curved door tubes: the most complete multipoint version for the three-door E81.

Why choose this multipoint E81 V4 NASCAR?

If your E81 is out on track every weekend, what matters is both how the cage transfers the forces into the bodyshell and how well the door opening is covered. This version addresses both: ten attachment points, a harness bar for your belts and several curved tubes per door. The cage is intended for track and competition use; always check the regulations of your own organiser before you enter.

Frequently asked questions

What do the NASCAR door bars add compared with the standard multipoint V4?

On the multipoint E81 V4 NASCAR, each door contains several curved tubes instead of the straight door bar. This gives more side protection while leaving more room to get in.

What is supplied and how does it fit?

You receive the weld-in kit with gussets and reinforcement plates, mounting hardware, documentation, fitting instructions and a sticker set. AST digitises the bodyshell of the three-door E81 with laser scanners, so the kit is designed for this specific bodyshell.

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.