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Brough Superior SS 100

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Brough Superior SS 100 review

In the company's advertising of the early 1920s the Brough Superior was hailed as the 'Rolls-Royce of motor cycles'; after the men from that famous marque's Crewe factory had examined the bike they had to concede that it did indeed live up to the title and they gave the Brough company permission to use the slogan. The motorcycle's performance was, however, quite different from that of the luxurious car to whose reputation it alluded. While the Rolls-Royce was more noted for its grace than its performance, the Brough could reach a genuine 100 mph, a speed that was thought to be far beyond the capabilities and safety limits of road bikes of this time.

BroughSuperior SS 100

The power unit of the first SS100 was a specially built, fifty degree vee-twin JAP of 988cc. What was most interesting about the engine was its valvegear which featured four separate little camshafts actuating the overhead valves through pushrods. The power output was claimed to be 45 bhp at 4500 rpm, with a really abundant supply of torque. Carburation was by a Wex, a B&B or a Binks unit, mounted on a T-shaped manifold in between the vee; sports models, however, had much more efficient breathing by way of twin Amal carburettors with long upright inlet tracts.

BroughSuperior SS 100

Early SS100s used a leading-link front fork of Harley-Davidson type, while the rear was completely rigid. The front design was chosen by George Brough as ideal for a high-speed bike, but it also dictated that if an effective front brake was fitted it would lock the forks in the fully extended position when applied with vigour. Needless to say, the internal expanding unit actually fitted was so weak as to be useless, so this problem never arose. On the other hand, the 8in rear brake was extremely powerful and much care was needed not to lock the back end up.

BroughSuperior SS 100

Brough Superior SS 100 specifications

Engine Type:
997cc watercooled dohc 88° V-twin four-stroke with four valves per cylinder, and composite chain/gear cam drive
Bore x stroke: 94 mm x 71,8 mm
Power: 127bhp (95 kW) @7800rpm
Torque: 120Nm (88lb-ft)@6400rpm
Compression ratio: 11: 1 Gearbox: 6-speed
Clutch: Multiplate oil-bath Adler clutch with hydraulic operation

CHASSIS
Frame type: Machined titanium frame with fabricated titanium subframe
Front suspension: Fior-type cast aluminium wishbone fork with twin articulated titanium triangular links, and Öhlins monoshock adjustable for preload and rebound damping with 120mm travel
Rear suspension: Cast aluminium swingarm pivoting in engine crankcases, with Öhlins monoshock adjustable for preload and rebound damping and progressive rate link with 130mm travel
Front brake: 4D Ceramic Beringer
2x floating double discs, aluminum-ceramic composite material, diameter 230 mm,
2x four pistons calipers with radial fixation and special sintered metal pads
Rear brake: Single disc brake, aluminum-ceramic composite material, diameter 230 mm,
2 pistons caliper with special sintered metal pads
Wheels: 18 spokes (aluminum)
Front rim: 3.50 x 18”
Rear rim: 4.25 x 18”
Front tyre: 120/70 ZR 18
Rear tyre: 160/60 ZR 18

DIMENSIONS
Fork angle: 23,365°
Fork offset: 38 mm
Trail: 93,65 mm
Width: 730 mm
Seat height: 820 mm
Dry weight: 186 kg (410 lb)

Tags:
retro vintage

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