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Description

AST Weld-in Roll Cage BMW F21 V5

The AST Weld-in Roll Cage BMW F21 V5 is a full roll cage for the BMW 1 Series F21 with three-door hatchback bodywork. This Weld-in F21 V5 is the most comprehensive specification in the weld-in range: the full set of bars, welded to the bodyshell at eight points.

The cage is designed and built by AST Roll Cages in Spain, for builders who make no compromises and want to make their F21 as rigid as it can possibly be.

Key benefits

• Full set of bars: the highest specification level AST offers for this bodyshell.
• Eight welded mounting points: the cage is fully integrated into the structure of the car.
• More tubing than the V4: extra bars where the V4 stops.
• E355 steel: main hoop 45 mm, rest of the structure 40 mm.
• Gussets: supplied to spread the forces at the welded mounting points across the sheet metal.
• 71 kg (manufacturer’s figure): despite the extra bars, the kit remains manageable in weight.
• Supplied unpainted, so you only do the finishing after welding it in.

Suitable for

BMW 1 Series F21, three-door hatchback

• BMW 1 Series F21 three-door hatchback, built 2012 to 2019
• Type: full weld-in roll cage, version V5
• Not interchangeable with the five-door F20: AST designs a dedicated cage for each body style
• Drifting, track use and rallying

Technical specifications

• Manufacturer: AST Roll Cages
• Manufacturer part number: CMBN06416
• 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)
• 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. Because of the full set of bars, welding it in takes longer than with a less heavily equipped version; discuss the order of the bars and the accessibility of the welded mounting points with your welder beforehand.

AST’s full set of bars, permanently welded into the three-door F21 for those who want the maximum.

Why choose this Weld-in F21 V5?

During long stints on track or a full season of drifting, a bodyshell slowly works itself loose; extra bars slow that process down. The V5 packs in more steel than any other cage AST designs for this car. AST digitises the bodyshell with laser scanners and designs the cage in 3D, so that even this dense set of bars drops into the F21 without any adjustment.

Frequently asked questions

What is the difference between the V4 and the V5?

The Weld-in F21 V5 has the full set of bars and therefore more tubing than the V4. The eight-point welded mounting and the steel used are the same on both.

Does this cage fit a five-door BMW F20?

No. This cage is designed for the three-door F21. AST has a separate cage for the five-door F20; the two are not interchangeable.

What about homologation?

The cage is intended for track and competition use. Always check the regulations of your own governing body or organiser before taking part in an event with this cage.

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.