AST Coilovers for BMW X1 F48, X2 F39, 1 Series F40, 2 Series F44 / F46 & Mini F54 / F60

One AST kit family covers the X1 F48, X2 F39, 1 Series F40, 2 Series Gran Coupe F44 and Gran Tourer F46, and the Mini Clubman F54 and Countryman F60, including the xDrive and ALL4 versions AST list. Not every series is listed for every car: where one is limited, its Series option says so.

• Seven kits, from the 5100 Street to the 5300 3-Way, with TCO versions for the Mini
• X1 F48 and 2 Series Gran Tourer F46: 5100 Street, 5200 2-Way and 5300 3-Way
• Includes the X2 M35i, 1 Series M135i xDrive, 2 Series M235i xDrive and Mini JCW ALL4 models
• Monotube dampers throughout, with a 12-position rebound adjuster

Choose your series

Every AST damper is a monotube: nothing inside can aerate or foam, which AST say keeps the valving responsive.

5100 Street, inverted (AST ACU)

The 5100 Street kit with inverted monotube dampers, adjustable for rebound damping and ride height. The front dampers are coilovers; at the rear the spring and damper stay separate, as the car was built. Springs come in the kit, which works with the car's original top mounts. AST fix the rear spring rate for each car. The rebound adjuster has 12 positions, and the dampers can be rebuilt.

AST part number: ACU-B1406S

5100 Street TCO, coilovers front and rear (AST ACU)

The 5100 Street kit in TCO form: inverted monotube coilovers at the front and the rear, adjustable for rebound damping and ride height. Springs come in the kit, which works with the car's original top mounts. The rebound adjuster has 12 positions, and the dampers can be rebuilt.

• ACU-B1407S (Mini only): Mini Clubman F54, Mini Countryman F60

5100 Street Performance (AST ACT)

The 5100 Street kit with camber-adjustable top mounts added at the front. Inverted monotube dampers, adjustable for rebound damping and ride height; coilovers at the front, and a separate spring and damper at the rear as the car was built. Adjustable camber lets you set the angle of the front wheels, and with it how the front end grips. AST fix the rear spring rate for each car. The rebound adjuster has 12 positions, and the dampers can be rebuilt.

• ACT-B1406S (not X1 F48 or 2 Series Gran Tourer): X2 F39, 1 Series F40, 2 Series Gran Coupe F44, Mini Clubman F54, Mini Countryman F60

5100 Street Performance TCO (AST ACT)

The 5100 Street Performance kit in TCO form: inverted monotube coilovers front and rear, adjustable for rebound damping and ride height. Camber-adjustable front top mounts are included, and solid rear ones where the car needs them. Adjustable camber lets you set the angle of the front wheels, and with it how the front end grips. The rebound adjuster has 12 positions, and the dampers can be rebuilt.

• ACT-B1407S (Mini only): Mini Clubman F54, Mini Countryman F60

5100 Clubracing (AST ACC)

The 1-way kit for cars that see track days as well as daily miles: inverted monotube coilovers front and rear, with top mounts at both ends. The front top mounts adjust for camber; the rear ones are solid. Spring rates can be changed to suit. Ride height adjusts, the rebound adjuster has 12 positions, and the dampers can be rebuilt.

• ACC-B1407S (not X1 F48 or 2 Series Gran Tourer): X2 F39, 1 Series F40, 2 Series Gran Coupe F44, Mini Clubman F54, Mini Countryman F60

5200 2-Way Motorsport (AST RIV)

Rebound and compression damping each have their own adjuster, and ride height adjusts too. Compression damping sets how quickly the suspension moves in; rebound sets how quickly it extends again. The dampers work with external reservoirs, mounted remotely. The struts are inverted, which AST use because that design copes with heavy sideways loads and with braking. Where the car needs them, camber-adjustable front and solid rear top mounts are included. Spring rates can be changed, and the rebound adjuster has 12 positions. AST made it first of all for track driving.

AST part number: RIV-B1407S

5300 3-Way Motorsport (AST RAC)

Three separate damping adjusters - rebound, low-speed compression and high-speed compression - plus adjustable ride height. Low-speed compression looks after slow, gradual movement of the suspension; high-speed compression looks after sharp, hard hits. The dampers work with external reservoirs, mounted remotely. The struts are inverted, which AST use because that design copes with heavy sideways loads and with braking. Where the car needs them, camber-adjustable front and solid rear top mounts are included. Spring rates can be changed, and the rebound adjuster has 12 positions. AST's kit for the most committed circuit drivers.

AST part number: RAC-B1407S

The photos are AST's own sample shots of each series, not of the kit for your car, which is made for its suspension and differs in detail.

Fitting notes

• 5200 and 5300 kits (AST's note, given for the Mini Clubman and Countryman): the rear comes with an extender for the adjuster knob, which needs a 12.5mm hole drilled, and the rear dampers are non-inverted.

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