Triumph Speed Twin: history, specs, pictures

**Triumph Speed Twin**
	Triumph Speed Twin
Manufacturer	Triumph
Also called	Speed Twin 5T
Production	1937 - 2019
Class	Cruiser
Engine	Liquid cooled, 8 valve, SOHC, Parallel twin
Bore / Stroke	96.5mm x 96.5mm
Compression ratio	11.0:1
Horsepower	96.96 HP (72.3 KW) @ 6750RPM
Torque	83.35 ft/lbs (113.0 Nm) @ 4950RPM
Fuel System	Multipoint sequential electronic fuel injection
Ignition	lucas altrnator
Transmission	Gear box: 6-Speed ; Final Drive: Chain ; Clutch: Wet, multi-plate assist clutch ;
Suspension	Front: 41 mm cartridge forks, 120mm travel ; Rear: Twin shocks with adjustable preload, 120 mm rear wheel travel
Brakes	Front: Double discs 305 mm ; Rear: Single disc 220 mm
Front Tire	120/70 ZR17
Rear Tire	160/60 ZR17
Wheelbase	56.3 inches (1430 mm)
Width	29.88 inches (759 mm)
Seat Height	31.81 inches (808 mm)
Weight	350.09 pounds (158.8 Kg) (dry), 209.0 kg (wet)
Manuals	Service Manual

1939 Triumph Speed Twin

The Triumph Speed Twin was a 490cc, 4-stroke, street motorcycle manufactured by Triumph from 1937 through 1958.

Edward Turner's revolutionary vertical twin only had a brief production period in the late 1930's when WWII intervened. Post-war, the Speed Twin re-appeared in similar form with the Addition of telescopic forks replacing the old style girders. Maroon Speed Twins were used by the majority of police forces in Britain and were popular for their speed and flexibility.

The Speed Twin was the basis for all Triumph twins until the 1980s. Its four-speed transmission was a simple design that would be used in several Triumph models over the years.

27 brake horsepower and tunable to 50 bhp for racing
Four-speed transmission in separate case
Top speed: 92 mph

1948[edit | edit source]

1948 Triumph Speed Twin

The Triumph Speed Twin was a Liquid cooled, 8 valve, SOHC, Parallel twin Cruiser motorcycle produced by Triumph between 1937 and 2019. Max torque was 83.35 ft/lbs (113.0 Nm) @ 4950 RPM. Claimed horsepower was 96.96 HP (72.3 KW) @ 6750 RPM.

Engine[edit | edit source]

A 96.5mm bore x 96.5mm stroke result in a displacement of just 1200.0 cubic centimeters. Fuel was supplied via a overhead valves (ohv).

Drive[edit | edit source]

The bike has a 6-Speed transmission. Power was moderated via the Wet, multi-plate assist clutch.

Chassis[edit | edit source]

It came with a 120/70 ZR17 front tire and a 160/60 ZR17 rear tire. Stopping was achieved via Double discs 305 mm in the front and a Single disc 220 mm in the rear. The front suspension was a 41 mm cartridge forks, 120mm travel while the rear was equipped with a Twin shocks with adjustable preload, 120 mm rear wheel travel. The bike weighed just 350.09 pounds (158.8 Kg). The wheelbase was 56.3 inches (1430 mm) long.

2019 Triumph Speed Twin[edit | edit source]

-

In Media[edit | edit source]

References[edit | edit source]