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Description

AST Weld-in Roll Cage BMW E81 V4 NASCAR door

The AST 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 weld-in E81 V4 NASCAR has the same layout as the standard V4, including the extra diagonal brace and the harness bar, but the doors contain several curved tubes instead of a single door bar.

The cage is designed and built by AST Roll Cages in Spain, for drifters and track drivers who want as much side protection as possible without making it harder to get in.

Key benefits

• NASCAR door bars: several curved tubes per door instead of the standard door bar.
• More side protection: the curved tubes fill the door opening better than a single straight bar.
• More room to get in: because the tubes curve outwards, you still have space to get in and out with a harness on.
• Diagonal brace and harness bar: the V4 level, with a fixed anchor point for the shoulder straps.
• Eight welded mounting points: the cage is welded directly to the bodyshell for the most rigid connection.
• E355 steel: main hoop with a diameter of 45 mm, the remaining tubes 40 mm.
• 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, 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: CMBN03608
• 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, 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: 8 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. The curved door tubes need extra attention during fitting, so have this work done by a welder who is familiar with roll cages. AST digitises the bodyshell with laser scanners and designs the cage in 3D, so that it fits your car exactly.

NASCAR door bars put more steel in the door for side protection while also giving you more room to get in.

Why choose this weld-in E81 V4 NASCAR?

In drifting and on busy track days, contact from the side is the most common, and that is exactly where a single door bar does the least. Several curved tubes per door fill that space better, while the outward curve still lets you slide easily into the bucket seat. The cage is intended for track and competition use; always check the regulations of your own organiser before you enter.

Frequently asked questions

What exactly are NASCAR door bars?

On the weld-in E81 V4 NASCAR, the door contains several curved tubes instead of the standard straight door bar. This provides more side protection while leaving more room to get in.

How is the cage matched to my car?

AST digitises the bodyshell of the three-door E81 with laser scanners and designs the cage in 3D on that basis. You receive the kit as loose tubes that are fitted in the car and welded in place at eight points.

What is the delivery time?

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