| Specification |
Engine: |
Configuration: | Air-cooled 4-stroke vertical twin |
Capacity: | 348cc |
Bore x Stroke: | 58.3mm x 65.5mm |
Compression: | 7.5:1 |
Transmission: |
Gears: | 4 |
Performance: |
Max. Power: | 18.5bhp @ 6500rpm |
Cycle Parts: |
Frame: | Single down-tube |
Front Wheel: | 3.25 x 17 |
Rear Wheel: | 3.25 x 17 |
Front Suspension: | Telescopic forks |
Rear Suspension: | Swinging arm |
Front Brakes: | 7in single leading shoe |
Rear Brakes: | 7in single leading shoe |
Dimensions: |
Length: | 2030mm |
Seat Height: | 724mm |
Wheelbase: | 1314mm |
Dry Weight: | 154.4kg |
Fuel Tank: | 16l |
The Twenty-one was the beginning of a new range of motorcycles from Triumph that would eventually include the 5TA, T100A, and end with the TR5T Adventurer (known as the C Class). It's 350cc engine was very reliable and made the motorcycle popular as a touring and commuting model.
The first bikes didn't have the parcel grid (known as the toast rack), but this was changed in 1957. In September 1958 the model was renamed the 3TA at the same time as the bigger 5TA was introduced - but the old Twenty-one name was still used in conjunction with 3TA.
In 1964 the fully enclosed bathtub fairing was changed for a smaller 'bikini' fairing, but the nacelle was retained. Eventually, in 1966, all the panelling was removed but the machine was soon after discontinued as the 350cc market had almost disappeared.
Profile created by Laurence Mee on 30/04/2010. Last edited by Laurence Mee on 30/04/2010.
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