Triumph Tiger Cub T20

Buyer's Guide


Trials | Sports | Competition | Mountain Cub | Super Cub | Super Cub


T20 Tiger Cub tank badge


Edward Turner

T20 Tiger Cub specifications

Cub engine


Specialists and links

Ownership tips

Owner's story

Tiger Cub headlight and nacelle

 ▲Designer Edward Turner's fingerprints are all over this Cub, metaphorically if not literally. The T20 is neat, perfectly proportioned, and so very stylish. It punches way above its weight.


Tiger Cub Zenith carburettor

 ▲ Zenith carburettor. Hard to get, and most are badly worn. So it's either an Amal or a Mikuni. And the Mikuni, although superior, just doesn't look quite right on a Tiger Cub.


Triumph Tiger Cub distributor/points housing

Some call it a "distributor", which is incorrect. It's a single cylinder bike, after all. There's only one plug to distribute the spark to. Better use the term "points housing".


Points housing for a Triumph Tiger Cub


Tiger Cub Smiths speedo drive


T20 Tiger Cub rear brake

Triumph Tiger Cub rear brake. The brakes ain't great, but they're adequate for the performance of this bike. Just keep the drums in tip-top shape (and wear thick-soled boots).


T20 Tiger Cub nacelle

T20 Tiger Cub Specifications


Type: Air-cooled OHV pushrod single

Capacity: 199cc (200cc)

Bore & Stroke: 63mm x 64mm

BHP: 10bhp @ 6000 rpm

Compression ratio: 7:1

Transmission: 4-speed, multi-plate wet clutch

Brakes: Single leading shoe drums
front and rear

Electrics: 6-volt, points ignition

Front suspension: Telescopic

Rear suspension: Swinging arm, twin shock absorbers/dampers

Wheels/Tyres: 3.00 x 19-inch front & rear

Weight: 205lbs (dry)

Maximum speed: 70mph (approximately)



T20 C Tiger Cub Competition

T20 S Tiger Cub Sports

T20 T Tiger Cub Trials

T20 SL Tiger Cub Scrambler

T20 SS Tiger Cub Sports

T20 S/H Tiger Cub Sports

TR20 Tiger Cub Trials

T20 S/C Tiger Cub Super Trials

T20M Mountain cub

T20 Super Cub (Bantam Cub)

Specialists and links


Tiger Cub Club

Mike Powell
Triumph Terrier and Tiger Cub Club
Back Lane
Worthen, Shropshire
01743 891889/07887 917466


Greystone Enterprises

Tiger Cub spares and breaking

Postal address: Unit 26 Reeves Yard, Warwick Road, Whitstable, Kent, CT5 1HX.
Telephone: 01227 861100


Triumph Owners Motor Cycle Club

Got the bike? Join the club. Branches nationwide. Knowledgeable people. Big social calendar.


Burton Bike Bits

Repro Tiger Cub tinware, plus genuine NOS

PO Box 7691, Ashby de la Zouch, LE65 2YZ. Telephone: 01530 564362



Serco [Possibly no longer trading]

New and used Tiger Cub spares and engineering)

2 Bracken Road, Brighouse, West Yorkshire,
HD6 2HW.
Telephone: 01484 715 288 / 01484 721 289


Hawkshaw Motorcycles

Triumph spares

6, Halltine Close, Blundellsands, Liverpool, L23 6XX.

Telephone: 0151 931 4488






was introduced in March 1954. Priced at £127 (a little over half the cost of a new Triumph 6T Thunderbird), it supplemented (and then superseded) the 149cc T15 Triumph Terrier; the company’s first post-war single.

The T20 Tiger Cub brief was clear and straightforward. It was to be a small bike with BIG pretensions. Or, if you prefer, BIG aspirations. A bike that filled a gap at the low end of the range. A bike that capitalised on the appeal of Triumph’s established muscle machines (the 498cc Speed Twin and Tiger 100 and 649cc Thunderbird), but with lightweight, commuter—and even boy racer—appeal.

The T20 Cub was also intended as an antidote to the fog of British two-strokes smoking up British streets. Which was no small consideration in view of the Great Smog of December 1952 which quietly—and perhaps not so quietly—murdered around 4000 people.

The 149cc T15 Terrier had shown the way. The T20 Cub gave the Terrier the extra bark it needed.


Triumph Terrier designer Edward Turner


Edward Turner


Triumph supremo Edward Turner (pictured above aboard a Terrier), typically, oversaw the project and wanted to kick BSA’s Bantam into touch. But it was Turner’s right hand man (and “pencil”), Jack Wickes, who translated the raw engineering numbers into a motorcycle that people actually wanted to swing a leg over.

And there were plenty of takers. Between 1953 and 1969, Triumph built and sold 113,671 Tiger Cubs (including Terriers) and mobilised thousands of teenage tearaways desperate from relief from the gritty poverty of a Britain still reeling from the victory of war.


Triumph T20 Tiger Cub


With its svelte looks, its simple unit-construction engine and affordable price tag, it was a bike that could shamelessly nudge up to its bigger brothers at the local transport café, and stay with the pack all the way to around 65mph, given favourable conditions.

It was frugal too, returning around 100mpg; an important marketing lever in an age where a young man’s wage was typically around £3-£4 a week with petrol costing around 4 shillings (20 pence) a gallon.



199cc Tiger Cub engineCub engine


The unit construction Tiger Cub engine, with its bore of 63mm and stroke of 64mm was originally designed to allow the extraction of the crankshaft with the engine still in the frame (via the drive/left side), but this was changed within a few years to a conventional split-case arrangement.

The flywheel was a pressed-up item driving two timing gears (one integral with the camshaft). The cylinder itself was made of cast iron and angled forward (in a racy style that, it’s said, Turner was not fond of). A chrome-plated tube carrying the two pushrods is typical of Triumph’s thinking and runs on the right side of the cylinder barrel between the crankcase and cylinder head.

The gearbox is a conventional four-speed unit housed in a separate crankcase compartment. All cubs have right-side gear change. Clutches are wet multiplate (3 plain, 3 friction).

The original carburettor was a specially designed Amal 332. But this was replaced in 1958 with a Zenith, and then replaced again September 1961 by an Amal Type 32 unit—which is what you’ll find on most Cubs today.

Early Cubs feature a points-housing (sometimes referred to as a distributor) on the top/right side crankcase behind the cylinder barrel. But from September 1963, this was deleted and the points were relocated on the right side of the engine on the timing cover.



Triumph Bantam CubTiger Cub production


All Cubs were built at Triumph's Meriden plant with 6V electrics, the power supplied by a crank-mounted alternator charging system. But many, if not most, modern examples have since been converted to 12V for improved reliability. The alternator sits on the left side of the engine in the primary case oil-bath.

Engine power varies substantially depending on the specific model, ranging from 10-14.5bhp @ 6000-6500rpm. Compression ratios also vary between 7:9 and 9:1.

Early Cubs employed plunger rear suspension. But from engine number 26276, swinging arms were introduced.


Tiger Cub Triumph


Cubs are in roaring demand these days, with prices ranging from around £1200 for a decent T&T runabout to as much as £4000 (asked) for a concours restoration. That’s big money for such a small bike. But on the plus side, this is an easy to live with classy lightweight with good handling, decent brakes, and enduring good looks. Hinckley Triumph may be missing a trick by not introducing a modern Cub of their own.

The last model, the T20 Super Cub (aka Bantam Cub), was produced in 1969. Part BSA Bantam and part T20 Triumph, these are attractive bikes and perform well, but they're along way from Edward Turner's vision, and they lack the charm of the original design.


199cc Tiger Cub from Triumph



Ownership tips


1. Check engine and frame numbers. Tiger Cubs are frequently "lashed up" from spare parts - which doesn't necessarily create a bad motorcycle. But such "lash ups" will affect resale value.


2. Ignition systems are a weak point and need regular maintenance. It isn't difficult to learn to set contact breakers (points), but it is vital that it's done accurately if you want to keep up with modern traffic (or at least not fall too far behind.


3.Cubs with swan neck frames require the correct fuel tank for structural support. Modified or non-standard tanks risk compromising integrity.


4. Early plain-bearing engines need warming before riding in anger, so take it easy for the first few miles.


5. Plunger-framed models need to have the plungers checked and greased every 1000 miles or so.


6. Use a straight 30-weight oil, or an ordinary non-synthetic multigrade, and change it every 1000 miles.



Triumph Tiger Cub T20 restored


Owner's story: Jeff Garrett


“I used to be a quality assurance auditor for a pharmaceutical company. One of the last projects I worked on were clinical trials for Viagra. Seriously. There’s a thing called the “first in man” program. Just as it sounds, that’s when the drug is tested for the first time on human volunteers – who, curiously enough, often turned out to be firemen, as if all that rushing into burning buildings wasn’t enough risk for one day.

“Anyway, Viagra was in fact developed as a medicine for various heart conditions and had nothing to do with impotence - and was certainly not a recreational drug. It was only when the 10-12 volunteers were lying in their beds waiting to have their daily readings taken that people noticed a … well, another side effect.

“But I’m retired now and those days are done. I get my personal excitement with my 1961 T20 Tiger Cub that I picked up some years ago. It was partially restored but needed finishing. I stripped the bike and refurbished it – and spent a lot of money in the process; probably more than it’s currently worth, but it was worth it.

 “Tiger Cubs are growing in popularity, and the days of picking them up cheaply are gone. Today you can expect to pay up to around £3500 for a top quality example, such as mine.

“And riding the bike is just great. It’s light, has good handling, and surprisingly powerful brakes - much better than you’d expect. Also, it’s got a very distinct crack to the pattern exhaust that sounds wonderful on the move. Who needs Viagra when you're riding a Tiger Cub?

"It used to have a Zenith carb fitted (which I’ve still got), but it was worn, and Zeniths aren’t available anymore. So I fitted an Amal 626 which was a great improvement. Fuel economy is pretty good, but I haven’t got an exact figure for it. I use unleaded fuel with Redex lead replacement additive.

“I’m heavily involved in the Deal & District Motorcycle Club, by the way. We’re about 100 strong and are fairly active. You can get more information at: See you sometime maybe.”



▲ Back to the top


Classic bike dealers, engineers, mechanics and experts



Sump Route 66 Road Trip

Motorcycle insurance

Buying a motorcycle crash helmet

Classic bike parts & services

Motorcyclists and the police


Come and check out the rhyme...


The Bet

S#!t Happens




If you've recently bought a Sump T-shirt, a book, a motorcycle lock, a framed print, a tin wall sign or whatever, and if your order hasn't arrived, you might want to check your email spam box. We regularly find that customers have failed to give the information we need to process the order (size, full address, style, colour, etc).


If there's a query, we make three attempts to contact buyers, and if we get no reply, we cancel the order and return any payment. But that can lead to disappointment, especially if the item is a gift for someone. So if you haven't heard from us within 24 hours of placing your order, please check your spam box, or contact us again.




Copyright Sump Publishing 2014