Mac Motorcycles Ruby: a modern and faithful cafe racer

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A new British-built cafe racer has been born from Mac Motorcycles: the Ruby.

The Ruby is a product of the motorcycle enthusiasts who make up Mac Motorcycles, from ex-motocrossers and trials riders to classic collectors.

This is reflected in the Ruby itself. A relatively ‘stripped down’ design with minimal bodywork (with a fairly self-explanatory color choice) and no fairing, the street-focused Ruby takes a utilitarian, no-nonsense off-road style and melds it with the classic curves of a a neo-retro cafe racer.

It is powered by a 600cc single-cylinder DOHC four-stroke with four valves, with a compression ratio of 12.4:1, and a bore and stroke of 100mm x 76.4mm. On their website, Mac also gives the measurements in imperial measurements, presumably to hark back to the motorcycle’s inspiration period in the 1960s.

But it’s not a dinosaur. It features electric start and electric fuel injection, a 1.8-litre wet sump, hydraulic clutch and six-speed transmission. Additionally, the exhaust is designed and manufactured specifically for the Ruby in Italy. It’s made from stainless steel and meets “current noise and emissions legislation, while retaining the distinctive ‘soundtrack’ of a great single,” says Mac.

The engine cranks out 52 horsepower, and the 17-inch rear wheel that that power is sent to is connected to the tubular steel frame via a wishbone swingarm. The whole thing is suspended by a shock absorber from the Oxfordshire company Nitron.

We also find a 17-inch wheel up front, this time with 47mm USD forks from Fastace. These come with compression and rebound adjustment as standard, and the same goes for the aforementioned Nitron shock.

Mac Motorcycles says the top speed should be around 100 mph, but that depends “on the size and shape of the jockey, the forces of Mother Nature, the steepness of the hill and the towing of the vehicle ahead.”

Stopping from this speed is via a 320mm front brake disc, with a radial caliper and master cylinder from Brembo, who also do the rear caliper and master cylinder for the disc 240mm rear.

There are also a few tire options available, with Michelin and Avon to choose from. The characteristics of the front and rear tires are below:

  • Front – 120/70R17 58H Michelin Street Radial or 120/70ZR17 58W Avon 3D Ultra Sport
  • Rear – 150/60R17 66H Michelin Street Radial or 150/60ZR17 66W Avon 3D Ultra Sport

Mac Motorcycles will start taking orders for the Ruby in the fall, but you can register your interest in one now on their website.

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