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Steel tube space frame. Blasted surface protected by zinc primer and polyester powder coating by Redditch Shotblasting. New Grinnall designed CNC billet fork bridge fork bridge providing revised steering geometry with reduced trail, guaranteeing precise handling, bullet-like straight line stability, light steering and zero tremor.


The image above shows the early stages of the body shape design. This was first shaped in foam, then covered in body filler. The shapes were then modelled until the final desired ‘plug’ was achieved. Moulds were then taken from this ‘plug’ to form the production moulds.



Fibreglass reinforced polyester, manufactured by hand, 2-pack paint finish. Standard BMW Motorcycle colour range. Bespoke colours at extra cost.



Motor Type: Four-stroke, two cylinder, horizontally opposed “Boxer” engine, air cooled.

Bore x Stroke: 101 x 70.5mm (3.97 x 2.77 in).

Displacement: 1130cc.

Max Power: 85 hp (62.5 KW) at 6,750 rpm.

Max Torque: 98 Nm/72 ft lb at 5,250 rpm.

Compression Ratio: 10.3:1.

Valves Per Cylinder: 4.

Valve Control: high cam, using chain drive, cup tappets, push rod and rocker arm.

Mixture Control/Engine Management: Electronic intake pipe injection/digital engine management: Bosch Motronic MA 2.4 with overrun fuel cut off, twin spark ignition (December 2002 on).

Emission Control: Closed loop 3 way catalytic converter.

Engine Lubricating System: Wet sump.


Single disc dry clutch, hydraulically operated.


Constant mesh 6 speed gearbox.

Gearbox Ratios:

2.050 / 1.600 / 1.270 / 1.040 / 0.900 / 0.700


Final Drive

Differential Ratio: 3.21.

Shaft Drive.



Front Suspension: BMW Motorrad Telelever; stanchion diameter 35 mm, central strut, rebound damping adjustable.


Rear Suspension: Grinnall CNC billet alloy uprights with double wishbones in oval tubing, unequal length, pivoting on stainless spherical joints. Inboard concentric coil springs and adjustable oil dampers. Inboard anti-roll bar. Adjustable tracking.


Ignition System

Electronic ignition, Bosch Motronic MA 2.4. Twin spark from December 2002.



700 W three phase alternator.




Front brakes: 320mm floating discs, 4 piston calipers. ABS and Servo Assistance on some models.

Rear brake: Hi-Spec 2-piston calipers acting on 254mm diameter discs (2).

Mechanical parking brake. Goodridge stainless steel braided brake lines.



Front: Standard BMW fitment wheel and tyre.

Rear: There are two choices of wheel:

1. Rimstock light alloy one piece wheel. 7 x 17in.

2. Bespoke Image Multi-Spoke, 3-piece billet rear wheels to match the style of the front wheel. 7 x 17in.

Tyres: 205/50/17.


Fuel tank

20 litre capacity (20.5 litre).



Fuel consumption: 35 – 45mpg depending on riding style.



Dry weight: 340kg approx.

Width Overall: 152.5cm.

Length Overall: 249cm.

Wheelbase: 180cm.



0-60 mph approx. 4.5 seconds.

Maximum speed: approx. 115mph.


rockster LH rear small.JPG