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Triumph Motorcycles

Twenty One

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Triumph Twenty One (1957 to 1966)

The Twenty One model was introduced in 1957 by Triumph Motorcycles to commemorate the brand's 21st anniversary. It was the first Triumph...

The Twenty One model was introduced in 1957 by Triumph Motorcycles to commemorate the brand's 21st anniversary. It was the first Triumph motorcycle with a unitized engine, integrating the engine and gearbox into a single block. Originally called the Twenty One, from 1959 it was officially designated the 3TA in its 349cc version, while the 498cc version was known as the 5TA. Both featured parallel twin-cylinder engines, 4 speed manual transmissions and chain final drives. A notable feature of these motorcycles was their closed rear fairing, nicknamed the "bathtub," which covered the rear of the bike. A design that made them easily recognizable and, although controversial in the American market, became a distinctive symbol of this era for Triumph. The Triumph Twenty One was produced until 1966.

Triumph Twenty One FAQs

Model years for Triumph Twenty One (1957 to 1966)

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Showing 24 of 47 related listings

Birmingham, GBR

1961 Triumph 3TA 350CC I2

Original & Highly Original

34k mi TMU

Manual

Center

Sold

£1,955

Iconic Auctioneers

Nov 9, 2025

Details

Lot 578: 1961 Triumph 3TA 350CC I2

Sold

£1,955 ($2,575)

34,343 mi TMU
Location: Birmingham, GBR
Originality:
Original & Highly Original

Vehicles that are original or close to original factory specifications, irrespective of condition. May include vehicles that have minor, removable modifications such as aftermarket wheels, exhaust, or accessories such as cargo/roof rack, stereos, etc.
Transmission: Manual
Driver side: Center

Vehicle Details

WEBSITE

Birmingham, GBR

1960 Triumph 3TA Twenty One

Original & Highly Original

18k mi TMU

Manual

Center

Sold

£2,760

Iconic Auctioneers

Nov 9, 2025

Details

Lot 596: 1960 Triumph 3TA Twenty One

Sold

£2,760 ($3,636)

18,020 mi TMU
Location: Birmingham, GBR
Originality:
Original & Highly Original

Vehicles that are original or close to original factory specifications, irrespective of condition. May include vehicles that have minor, removable modifications such as aftermarket wheels, exhaust, or accessories such as cargo/roof rack, stereos, etc.
Transmission: Manual
Driver side: Center

Vehicle Details

WEBSITE

Birmingham, GBR

1959 Triumph 3TA Twenty One

Project

17k mi TMU

Manual

Center

Sold

£1,782

Iconic Auctioneers

Nov 9, 2025

Details

Lot 615: 1959 Triumph 3TA Twenty One

Sold

£1,782 ($2,347)

17,525 mi TMU
Location: Birmingham, GBR
Originality:
Project

Vehicles that are partially operable or non-operable that are suitable for restoration or customization.
Transmission: Manual
Driver side: Center

Vehicle Details

WEBSITE

Birmingham, GBR

1957 Triumph 3TA Twenty One

Project

32k mi TMU

Manual

Center

Sold

£1,610

Iconic Auctioneers

Nov 9, 2025

Details

Lot 633: 1957 Triumph 3TA Twenty One

Sold

£1,610 ($2,121)

32,806 mi TMU
Location: Birmingham, GBR
Originality:
Project

Vehicles that are partially operable or non-operable that are suitable for restoration or customization.
Transmission: Manual
Driver side: Center

Vehicle Details

WEBSITE

Metropolitan Borough of Solihull, GBR

1966 Triumph 3TA

Project

26k mi

Manual

Center

Sold

H&H Auctioneers

Oct 29, 2025

Details

Lot 62552: 1966 Triumph 3TA

Sold

25,979 mi
Location: Metropolitan Borough of Solihull, GBR
Originality:
Project

Vehicles that are partially operable or non-operable that are suitable for restoration or customization.
Transmission: Manual
Driver side: Center

Vehicle Details

WEBSITE

Central Bedfordshire, GBR

1964 Triumph 3TA 348CC

Original & Highly Original

37 mi TMU

Manual

Center

Not Sold

Iconic Auctioneers

Jul 20, 2025

Details

Lot 597: 1964 Triumph 3TA 348CC

Not Sold

37 mi TMU
Location: Central Bedfordshire, GBR
Originality:
Original & Highly Original

Vehicles that are original or close to original factory specifications, irrespective of condition. May include vehicles that have minor, removable modifications such as aftermarket wheels, exhaust, or accessories such as cargo/roof rack, stereos, etc.
Transmission: Manual
Driver side: Center

Vehicle Details

WEBSITE

Metropolitan Borough of Solihull, GBR

1967 Triumph T35 wd

Original & Highly Original

1k mi

Manual

Center

Sold

£3,450

H&H Auctioneers

Jul 9, 2025

Details

Lot 62119: 1967 Triumph T35 wd

Sold

£3,450 ($4,573)

1,259 mi
Location: Metropolitan Borough of Solihull, GBR
Originality:
Original & Highly Original

Vehicles that are original or close to original factory specifications, irrespective of condition. May include vehicles that have minor, removable modifications such as aftermarket wheels, exhaust, or accessories such as cargo/roof rack, stereos, etc.
Transmission: Manual
Driver side: Center

Vehicle Details

WEBSITE

Staffordshire, GBR

1967 Triumph 3TA/'TWENTY One'

Original & Highly Original

10k mi

Manual

Center

Sold

£1,955

Bonhams

Apr 27, 2025

Details

Lot 405: 1967 Triumph 3TA/'TWENTY One'

Sold

£1,955 ($2,602)

10,708 mi
Location: Staffordshire, GBR
Originality:
Original & Highly Original

Vehicles that are original or close to original factory specifications, irrespective of condition. May include vehicles that have minor, removable modifications such as aftermarket wheels, exhaust, or accessories such as cargo/roof rack, stereos, etc.
Transmission: Manual
Driver side: Center

Vehicle Details

WEBSITE

Las Vegas, Nevada, USA

1957 Triumph Model Twenty-One

Original & Highly Original

38k km (23k mi)

Manual

Center

Not Sold

$7,000

Mecum

Jan 31, 2025

Details

Lot F114.1: 1957 Triumph Model Twenty-One

Not Sold

$7,000

38,106 km (23,678 mi)
Location: Las Vegas, Nevada, USA
Originality:
Original & Highly Original

Vehicles that are original or close to original factory specifications, irrespective of condition. May include vehicles that have minor, removable modifications such as aftermarket wheels, exhaust, or accessories such as cargo/roof rack, stereos, etc.
Transmission: Manual
Driver side: Center

Vehicle Details

WEBSITE

Sheboygan County, Wisconsin, USA

1961 Triumph 3TA "Twenty One"

290 mi TMU

Manual

Center

Last Asking

$11,900

The Throttlestop

Aug 19, 2024

Details

Lot 813451: 1961 Triumph 3TA "Twenty One"

Last Asking

$11,900

290 mi TMU
Location: Sheboygan County, Wisconsin, USA
Transmission: Manual
Driver side: Center

Vehicle Details

DEALER'S WEBSITE

Central Bedfordshire, GBR

1958 Triumph 3TA Twenty One 498CC

TMU

Manual

Center

Sold

£1,840

Iconic Auctioneers

Jul 14, 2024

Details

Lot 423: 1958 Triumph 3TA Twenty One 498CC

Sold

£1,840 ($2,386)

TMU
Location: Central Bedfordshire, GBR
Transmission: Manual
Driver side: Center

Vehicle Details

WEBSITE

Metropolitan Borough of Solihull, GBR

1963 Triumph 3TA

TMU

Manual

Center

Not Sold

H&H Auctioneers

Jul 3, 2024

Details

Stafford, GBR

1961 Triumph 350CC Twenty One Project

Project

TMU

Manual

Center

Sold

£1,150

Bonhams

Apr 21, 2024

Details

Lot 207: 1961 Triumph 350CC Twenty One Project

Sold

£1,150 ($1,441)

TMU
Location: Stafford, GBR
Originality:
Project

Vehicles that are partially operable or non-operable that are suitable for restoration or customization.
Transmission: Manual
Driver side: Center

Vehicle Details

WEBSITE

1966 Triumph 350CC 3TA T35 Military Motorcycle

Stafford, GBR

1966 Triumph 350CC 3TA T35 Military Motorcycle

Project

TMU

Manual

Center

Sold

£1,380

Bonhams

Apr 21, 2024

Details

Lot 211: 1966 Triumph 350CC 3TA T35 Military Motorcycle

Sold

£1,380 ($1,729)

TMU
Location: Stafford, GBR
Originality:
Project

Vehicles that are partially operable or non-operable that are suitable for restoration or customization.
Transmission: Manual
Driver side: Center

Vehicle Details

WEBSITE

Glendale, Arizona, USA

1960 Triumph 3TA Twenty-One

Original & Highly Original

6k mi

Manual

Center

Sold

$9,000

Mecum

Mar 7, 2024

Details

Lot T259: 1960 Triumph 3TA Twenty-One

Sold

$9,000

6,473 mi
Location: Glendale, Arizona, USA
Originality:
Original & Highly Original

Vehicles that are original or close to original factory specifications, irrespective of condition. May include vehicles that have minor, removable modifications such as aftermarket wheels, exhaust, or accessories such as cargo/roof rack, stereos, etc.
Transmission: Manual
Driver side: Center

Vehicle Details

WEBSITE

Montpellier, Occitania, FRA

1965 Triumph 349CC 3TA/TWENTY One

Project

TMU

Manual

Center

Sold

£1,840

Bonhams

Feb 26, 2024

Details

Lot 128: 1965 Triumph 349CC 3TA/TWENTY One

Sold

£1,840 ($2,335)

TMU
Location: Montpellier, Occitania, FRA
Originality:
Project

Vehicles that are partially operable or non-operable that are suitable for restoration or customization.
Transmission: Manual
Driver side: Center