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Description

AST Weld-in Roll Cage BMW E46 Compact V4

The AST Weld-in Roll Cage BMW E46 Compact V4 is a full roll cage for the BMW E46 with 3-door Compact bodywork. This Weld-in E46 Compact V4 builds on V3 and adds extra diagonal bars and a harness bar, giving the shoulder straps a fixed anchorage point.

The cage is designed and built by AST Roll Cages in Spain, for drivers with a proper bucket seat and a multi-point harness who want their mounting points sorted properly.

Key benefits

• Harness bar: a fixed and correct anchorage point for the shoulder straps of a multi-point harness.
• Extra diagonals: the rear section can no longer deform into a parallelogram.
• Full side protection: the door bars from V3 are retained on both sides.
• Eight welded mounting points: permanently welded, with no bolts that can work loose.
• E355 steel: 45 mm main hoop and 40 mm for the rest of the structure.
• 71 kg: a hefty build that is still manageable.
• Unpainted weld-in kit: including gussets and reinforcement plates.

Suitable for

BMW E46, 3-door Compact

• BMW E46 3-door Compact
• Type: weld-in roll cage, version V4
• Drifting, track use and rallying

Technical specifications

• Manufacturer: AST Roll Cages
• Manufacturer part number: CMBN03032
• 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
• 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. Settle the seat position before any welding is done, as the height of the harness bar must match the driver’s shoulder height.

V4 is the first version in which your harness gets its own bar instead of a makeshift solution behind the seat.

Why choose this Weld-in E46 Compact V4 roll cage?

A harness is only safe if the shoulder straps run at the correct height and angle, and that is exactly what this bar is for. The extra diagonals also make the rear section torsionally rigid, which you will notice in the traction when powering out of a corner. AST digitises the bodyshell with laser scanners and designs the cage in 3D, so that everything fits into the Compact without modification.

Frequently asked questions

What is the harness bar for?

The harness bar of the Weld-in E46 Compact V4 is the mounting point for the shoulder straps, so that they run at shoulder height and the load in an impact is transferred into the cage.

Is this a weld-in cage or a multipoint cage?

This is the weld-in version with 8 welded mounting points. The multipoint weld-in version uses 10 welded mounting points and anchors the cage at even more places in the bodyshell.

What is the delivery time?

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