Cognito Moto’s 1000cc BMW R75/5

When we started building this 1971 BMW R75/5, the goal was to retain the character of the original Airhead while improving its stance, handling, braking, and performance.

The finished bike combines a rebuilt 1000cc boxer engine with BMW R nineT forks, Brembo brakes, Cognito Moto wire wheels, rearsets, and custom triple clamps. It was built for the show circuit, but every decision was made with riding in mind.

Modern suspension and classic proportions

We replaced the original front end with forks from a 2016 BMW R nineT. To make the conversion work with the vintage BMW frame and 18 inch wheels, we designed custom triple clamps with 50mm of offset.

Our R nineT fixed offset triple tree conversion is available with several offset options for fitting R nineT forks to vintage motorcycles while maintaining the correct steering geometry.

At the rear, we fitted a longer R75/6 swingarm with Öhlins shocks. The result is a lower, more planted stance without losing the proportions that make the early BMW Airheads so recognizable.

Cognito Moto wire wheels and Brembo brakes

The bike rolls on black Cognito Moto wire spoke wheels fitted with Dunlop K180 flat track tires. The classic wheel design works naturally with the older BMW frame while allowing us to use modern braking components.

Twin Brembo calipers and Galfer rotors provide the stopping power at the front. The rear was also converted to a hydraulic Brembo disc brake.

For dual shock BMW Airheads originally equipped with a rear drum, our BMW Airhead lace hub and rear disc conversion provides a direct solution for adding a wire wheel and Brembo rear disc brake.

The braking performance is a substantial improvement over the original setup and better matches the upgraded engine and suspension.

A 1000cc boxer engine

The original R75 engine was completely rebuilt with a Siebenrock 1000cc kit. Lightweight high compression pistons and Nikasil lined cylinders increase displacement and torque while preserving the appearance and character of the BMW boxer engine.

The cylinder heads were rebuilt with Kibblewhite valves, guides, and springs. We also replaced the engine gaskets and installed a new clutch.

A pair of 38mm Dell’Orto carburetors feeds the engine, while the custom exhaust gives the larger boxer a deeper and more aggressive sound.

We upgraded the electrical and charging systems with an EME electronic ignition, new coils, a high performance starter, an Enduralast III alternator, and an adjustable voltage regulator.

A more purposeful riding position

Low rise Renthal handlebars establish the tracker inspired riding position. The cockpit includes a Brembo master cylinder, Motogadget mini switches, new control cables, and a Motogadget gauge with a digital speed display.

Our BMW Airhead rearset kit moves the controls into a more engaged position and is available for Airheads using a factory drum brake, factory disc brake, or our rear disc conversion.

The result is a riding position that feels sportier without making the motorcycle uncomfortable or impractical.

Restrained bodywork

The fuel tank was finished in red and black, while the frame and wheel rims were powder coated black.

Meyerbuilt Metalworks formed the front fender by hand, and New Church Moto upholstered the custom seat. The shortened rear subframe incorporates an LED tail light directly into the frame loop, keeping the rear of the motorcycle clean.

Lighting is handled by an HID headlight, Motogadget mini turn signals, and the integrated rear light. A Motogadget mo.unit Blue controls the electrical system and provides Bluetooth access without adding visible clutter to the bike.

Built to work as a complete motorcycle

The individual modifications are significant, but the bike works because no single component overwhelms the rest of the design.

The boxer engine and steel frame still give it the unmistakable feel of an early BMW. The modern suspension, Brembo brakes, improved electronics, Cognito Moto wheels, rearsets, and triple clamps make it a far more capable motorcycle.