Triumph TRW Parts & History

We have made this brief history page as there is currently very little information on the internet about the Triumph TRW. We also have a wide range of spares for these bikes, for example, complete engines/gearboxes.

Triumph TRW 500cc Side Valve MK3The Triumph TRW was designed in 1943, but by the time the bike was finished, the war was over and the military had a surplus of bikes left over. In 1948 the TRW was released in it’s final form and were sold to the British Army as well as other branches of the military, at home and abroad. This continued until the 1960s.

The 500cc side valve engines were used with many of the commercial productions machines in order to keep costs low.
MK1      BTH Magneto Model
MK2     BTH Magneto Model
MK2B    DKX2 Distributor, 1 ignition coil
MK3      Contact Breaker, twin Coil Ignition

The TRW was used by various countries for Military purposes around the world, including; Canada, Pakistan, Holland, Germany, South Africa…

Classic Motorcycle January 1994: “In a production run from 1950 to 1964 Triumph turned out 15,939 machines. Some reached other arms of the British services, but the vast majority were exported.”

Burton Bike Bits now have a very large range of parts and spares for TRW models. See below or search our catalogue using part numbers.

New Old Stock Triumph TRW Parts from USA

We have just received a new consignment of Triumph TRW parts including Alternator stators and rotors, rear mudguards, rear carriers, air filter elements, clutch centres, crankshafts and much more! All GENUINE NEW OLD STOCK! Sign up to our newsletter to receive the full details.

Triumph TRW Parts

Below are a few of the parts which we have available for TRW.Contact us for more info.

All of the below are Genuine NOS unless stated otherwise. Some parts are boxed, obviously we do now want to rip the boxes open.

Triumph TRW Parts Books and Manuals also available

Part #DescriptionPhoto
(Click To Enlarge)
W270AWM3x19 Dunlop Rear Wheel rim only, Army GreenSuitable for Triumph TRW, plus Various BSA and Triumph models with cotton reel hub Dunlop Wheel Rim WM3x19 W270A

W351WM2x19 Dunlop Front Wheel rim only, Army Green or RedSuitable for Triumph TRW & 3T 5T 6T T100 up to 1956 Dunlop Wheel Rim WM2x19 W351
W888WM3x19 Dunlop Chrome Rear Wheel, c/w
W951 7″ Drum
W861 Hub
W762 Rear Brake Anchor plate complete assembly
Bearings and Spindle etc

W937WM2x19 Dunlop Front Wheel, c/w
W940 7″ Drum (Qualcast)
W573A Hub,
W585 Front Brake Anchor Plate Complete assembly
W578 Spindle
Bearings etcSuitable for Triumph TRW & 3T 5T 6T T100 up to 1956Buy Online
W397 Front Wheel Assembly Triumph

W938WM2x19 Dunlop Front Wheel, C/w
W940 7″ Drum (Qualcast), and W573A Hub, Army GreenSuitable for Triumph TRW & 3T 5T 6T T100 up to 1956Buy Online
WM2 x 19' Dunlop Front Wheel Genuine NOS - Triumph

Triumph TRW Taper Rear Wheel Bearings
Genuine NOS
Triumph TRW Kick Start Quadrant
Genuine NOS
Triumph TRW Kickstart Quadrant
Inner Chaincase Cover
Triumph TRW
Triumph TRW Inner Chaincase 57-0889
Triumph TRW Chainguard, Army Green
Genuine New Old StockBuy Online
T993 Chainguard - Triumph TRW GENUINE NOS
Primary Chaincase Cover (Alternator Type)
Genuine New Old Stock, in Army Packaging
Triumph TRW Primary Chaincase Cover
Triumph TRW Gearbox Assembly
Also suitable for Triumph Rigid 3T/5T/T100/6T
Triumph TRW Gearbox Assembly (T1336)
57-1336KITTriumph TRW Gearbox kit, For self assembly
Also suitable for Triumph Rigid 3T/5T/T100/6T
Triumph TRW Gearbox Kit
Complete Clutch Assembly
Triumph TRWBuy Online
T1360 Complete Clutch - Triumph TRW / 5T Speed Twin
Front Brake Cable
Triumph TRW
Triumph TRW Front Brake Cable 60-0247
Black Flexible Battery Box complete with 2x Sealed for life 6V, 4.5Amp Batteries (Can be used as 6v or 12v) Reproduction
Triumph TRW Timing Cover
(In original army packaging)
Triumph TRW Timing Cover
Triumph TRW Camshaft
Genuine New Old StockBuy Online
Conrod for Triumph TRW
Genuine NOS
Triumph TRW Conrod
Oil Pump Ass, Genuine New Old Stock

Buy Online

Triumph TRW Oil Pump 70-2354
70-2795S/SStainless Oil Pressure Release Valve, with indicator button
UK Made reproduction
Stainless pop-out release valve, Triumph TRW
70-2806/7Cranksase Assembly complete with

  • E2331 Main Bearin Bush
  • E1591 Ball Bearing
  • E2926 Oil Seal

Genuine NOS

Buy Online

E2806/7 Triumph TRW Crankcase Assembly
Oil Seal, Crankshaft Drive Side

Buy Online

E2926 Oil Seal - Crank Shaft Drive Side Bearing - Triumph TRW
Siamese Exhaust Pipes, Chrome

Buy Online

Siamese Exhaust Pipes - Triumph TRW
Triumph TRW Cylinder Head
Genuine NOSBuy Online
Triumph TRW Cylinder HeadTriumph TRW Cylinder Head
UK MadeBuy Online
Triumph TRW Silencer 70-3450
Engine Sprocket 19T
Other sizes available (17T/21T/22T/23T/24T)
Triumph TRW
Triumph TRW Engine Sprocket E3108
Triumph TRW Cylinder Barrel
63mm bore, Genuine New Old Stock, Ex Canadian Army, Still wrapped in original Canadian Army Packaging
Barrel only, Pistons available separatelyBuy Online
Triumph TRW Cylinder Barrel 70-3524Triumph TRW Cylinder barrels
Contact Breaker Housing, c/w points plate, A & R etcContact breaker assembly Triumph TRW 70-5813
Triumph TRW Knee Grips
Made in EnglandBuy Online
Triumph TRW Pre Unit Knee Grips 82-1605/6
Right Hand Front Footrest
Triumph TRW
Triumph TRW Front Footrest F3114
82-3079Triumph TRW Sump Guard
Genuine NOS
Triumph TRW Sump Guard
Triumph TRW Side Stand Ass
Genuine NOSBuy Online
Triumph TRW Side Stand
Carb Inlet Hose Rubber
Triumph TRW
Buy Online
Carb Inlet Hose Rubber Triumph TRW 82-3114
Rear Mudguard c/w Tailguard
Painted Green with gold pin
Genuine NOSBuy Online
F3126 Triumph TRW Rear Mudguard
Rear Tail Guard
Painted Green with gold pin
Genuine NOSBuy Online
Painted Rear Tailguard - Triumph TRW
Rear Mudguard Bracket/Support Stay
Genuine NOSBuy Online
F3131 Triumph TRW Rear Mudguard Stay
Petrol Tank New and Secondhand
Triumph TRWBuy Online
Carb Inlet Hose Rubber Triumph TRW 82-3114
Triumph TRW Rear Number Plate
Triumph TRW Rear Number Plate
Solex Petrol Pipe Assembly
1/4″ Gas/Banjo
Genuine NOSBuy Online
82-3879 (F3879) Petrol Pipe Assembly Triumph TRW
Triumph Handlebar Grips
High Quality UK MadeBuy Online
97-0382ATriumph TRW Fork Stanchions
UK MADE, Reproduction
97-0566Triumph TRW Front Mudguard
UK Made ReproductionBuy Online
Triumph TRW Front Mudguard 97-0566
Triumph TRW MK1/MK2 Nacelle Top Cover
Genuine New Old Stock
Buy Online
Triumph TRW Fork Bottom Yoke
Buy Online
26WH/1552Solex Triumph TRW Carburettor

Buy Online

Solex Triumph TRW Carburettor
26WH/2Solex Carb Overhaul Kit

Buy Online

CP105Triumph TRW Pistons
in Std/+20/+40
Genuine NOSBuy Online
Triumph TRW Pistons
ENTRW-ASSTriumph TRW Engine Kit – Most major parts needed to assemble engineTriumph TRW Engine Kit
ENTRW-2BTriumph TRW Engine
c/w Carb and distributor
MK2 and MK3 available
Reconditioned (by Canadian Army)
Triumph TRW Engine for sale
LU466168Alternator Stator, Hexagon
Triumph TRW
Lucas Hexaganol Alternator Rotor LU466168
LU466230/ LU465969Alternator Rotor, Genuine NOS Lucas
Triumph TRWBuy Online
LU466230/LU465969 Lucas Alternator Rotor - Triumph/ Royal Enfield
LU838591Triumph TRW Wiring Harness
MK2 (PRS8 Switch, DKX2A Distributor)Buy Online
Triumph TRW wiring harness
MC123Triumph TRW Wiring Harness
MK3 (Coil ignition, twin contact breaker)
UK Made ReproductionBuy Online
Triumph TRW Wiring Harness
CY89349BTH Generator Complete
Genuine NOS
Triumph TRW MK1/MK2Buy Online
BTH Generator (Stator & Rotor) NOS - Triumph TRW MK1/MK2
CY110232-G1Bakelite Swith Complete BTH
Genuine NOS
Triumph TRW MK1Buy Online
Bakelite BTH Light Switch (NOS) - Triumph TRW MK1
CY110232-G1BTH Magneto Pinion
Genuine NOS
Triumph TRW MK1/MK2
Buy Online

Triumph TRW for Sale

Advertise your bike here! Contact us!

Make : TriumphModel : TRWCC`s   : 500 ccYear : 1956Frame number :TRW 25113NA Now SoldTriumph TRW for Sale

Triumph TRW Canadian Army

We have lots of customers in Canada who purchased their bikes in the mid sixties from Army Surplus. Below you will see an advert taken from the Northwest Cycle and Motor Co. Ltd (551 Logan Ave, Winnipeg Manitoba, Canada). Thanks to Bill White for this image!

Triumph TRW Advert

Triumph TRW Register

We are putting together a register for the Triumph TRW to establish where the bikes currently reside, their condition, and where they were originally shipped to.

Please note, the TRW Register has now moved to Classic Bike History

Engine/Frame #YearShipped toCurrent LocationCondition
TRW 6128NA1951Saudi ArabiaLeeds, UKBTH Ignition, on the Road
TRW 6231NA1951Keighley, W Yorks, UKConverted to a Trials bike
TRW 14304NA1951Cape Town, South AfricaMablethorpe, UKOriginal Condition
TRW 22019NACyprusVale of Glamorgan, Wales, UKFound in Northern Cyprus in 1991 dumped under an olive tree 3 miles from the main road under Five Finger Mountain. Probably ex RAF
85% Restored.
TRW 22338NATriumph TRW SwitzerlandUnknownArosa, SwitzerlandOn the engine we have something like TRW 22338 NA overstamped by another one that says TRW 25335 NA. The number on the gearbox says 25806 NA and the vehicle document of identification from switzerland says that this TRW is an 1952 but I think its a ’56.
TRW 23323NA1955UnknownTonbridge Wells, UKWith Engine 25822XNA
TRW 23834NA1956Eindhoven, NetherlandsRestored, Purchased from Wiekenvorst, Belgium in 1981/2
TRW 23858NA1956Eindhoven, NetherlandsRestored, Purchased from Wiekenvorst, Belgium in 1981/2
TRW 24004NA1956
TRW 24524NA1956Nova Scotia, CanadaHas 1700 miles on the clock and is going through a complete restoration
TRW 24992NA1956Canadian ArmyWindsor, Ontario, CanadaCheck out Heather’s story
TRW 24319NATriumph TRW FranceUnknownBelleu, FranceUndergoing Restoration
TRW 25080NA
Triumph TRW Ontario
1956Newmarket, Ontario, CanadaGood Working Condition
TRW 25107NATRW Parts1956Sold “in the crate” at Gagetown NB, date unknown to meHagersville, Ontario, CanadaMostly engine and transmission parts
TRW 25113NATriumph TRW 19561956Originally went to Canada, then GermanyPontyclun, Mid GlamorganOriginal, 1717 miles on the clock. Taken out of the crate in 1991.
TRW 25132NA

1956Sold “in the crate” at Gagetown NB, date unknown to me, as were a number of other machines in the Fredericton area, 2 others of which still existed in1979 by my personal knowledge, 1 complete in a garden shed, very well cared for, 1 in parts and for sale.Hagersville, Ontario, CanadaComplete, running
TRW 25302NA1956Used by the British Police in Malaysia and ended up at the Polytechnic School in the town of IpohaChico, California, USABrought back from Malaysia in 1980
TRW 25607NA1957CanadaQuebec, CanadaBrand new, out of the crate.
TRW 25776NA1957IrelandConnecticut, USAPurchased from an auction in Ireland circa 1974
TRW 25823XNA1957Birmingham, Alabama, USA
TRW 25869NA1957CanadaBC, CanadaUndergoing Restoration
TRW 25891NA
Triumph TRW Canada
1957Canada, MILITARY 57-94003Montreal, CanadaD&C(dusting and cleaning), change fluids, tune up and run
519 Miles
TRW 25911NA1957California, USADone a lot of work to it but have left the original paint. It doesn’t like hills, 3rd gear 45 mph. I’ve had it up to 62 mph.
Took it on two British rides, both about 100 miles. Both had about 200 bikes. Both
times it was the only TRW there and it ran great. Got a lot of attention
TRW 25928NA
Triumph TRW USA
1957Canadaian ArmyMichigan, USAUnrestored, Good working condition
TRW 26045NA1957Barber Museum, Alabama, USARestored, Ex Steve McQueen
TRW 26066NACanadian Army Triumph TRW1957Canadian Army origin, likely sold surplus from CFB EsquimaltVictoria, BC, CanadaUndergoing Restoration
TRW 26129NACanadian MilitaryOntario, CanadaHas been shuffled from owner to owner as a project bike, but it is probably a former Canadian military surplus motorcycle.
TRW 26155NA
Triumph TRW new out of the crate
1957CFB London Ontario, Canada then CFB Esquimalt for disposalVictoria, BC, CanadaNew Original, fresh out of crate + 33 miles (I had to try it)
TRW 26546NA1957PakistanArvada, Colorado USABike came to the US via New Orleans from Pakistan or India and is black.
TRW 26889NA1957PakistanArzignano – VI (Italy)Undergoing Restoration
TRW 27414XNA1960UnknownAsheville, NC, USAIn 2011 I the engine was bought and shipped from Florida, USA to North Carolina, USA. Engine is undergoing a complete tear down. I have severe wear on one of the valve blocks and some minor were on that same blocks cam lobe. I am maintaining a blog at
TRW 27489NAMalta, NavyGozo, MaltaRestored, Navy Trim
TRW 27611NAThe original engine having seized and showing some internal damage from a previous failure (after leaving the Army it had had three owners before me and it looked like it had been ‘well used’) I acquired engine 27611NA in September 1997 from an advert in Old Bike Mart.  Having fitted it to my bike and got it running there was a distinct absence of oil pressure.  The engine was taken out and stripped and rebuilt (not by me) but no change.  It was looked at again but the problem could not be solved.  I then saw engine 29439NA, again in OHM, so I got that and it has been running fine ever sinceErskine, Scotland
TRW 27616NASouth AfricaVredenburg Western Cape, South AfricaBought it at a military auction in +- 1973 at Snake Valley, Pretoria, South Africa. I have owned it ever since and it has been registered and running since then. At some stage being my only mode of transport during my apprenticeship
TRW 28854NA1963Purchased from County Cork, originally used for the Irish presedntial escort in 1963 along with 5 others.Co Clare, IrelandUndergoing restoration
TRW 29008NA1964M O D plate shows it to be 290008 of contract A 3231 Dated 1964Cheshire, EnglandRunning and in reasonable condition
TRW 29024NA1964MOD/Army Contract No. 3231 and was made in October 1964.   (Contract No. 3231 ran from 14 October 1964 to January 1965 and comprised of 515 motorcycles, reduced from 618)  My TRW was demobbed at some point between 29 April and 2 May 1969 when it was sold at MOD Auction No. 100 at Ruddington, Nottinghamshire.Erskine, ScotlandUnrestored but fitted with different engine (29439NA)
TRW 29101NA1964Canadian ArmyKirkby in Furness, UKMachined ready to replace 29155NA if ever needed
TRW 29133NA1964MOD, LondonOetwil am See, SwitzerlandUndergoing Restoration
TRW 29155NA
Triumph TRw TR6
1964Canadian ArmyKirkby in Furness, UKEngine only Built by Hughie Hancox using a TR6 as a basis. Quite a lot of machining needed to match up the TR6 Primary chaincase. Amal 275 carb, Slickshift gearbox, BTH Magneto.
TRW 29195 NA1964Eindhoven, NetherlandsRestored, Painted Red
TRW 29257NA1964Eindhoven, NetherlandsUndergoing restoration, Purchased from JV Motors in Zwartsluis
TRW 29341NA
Frame 29271
1964Suffolk, UKWhen I bought it the bike had done less than 100 miles during the past 6 years (according to MOT records) but I have now ridden about 150 miles in the past couple of weeks and it rides much better than I thought it might. The bike has been converted to 12v electrics and electronic ignition but it otherwise appears reasonably standard.
TRW 29384NA1964Essex, UKNow Undergone an RAF Rebuild
Triumph TRW RAF
TRW 29385NA1964MOD, LondonDevon, UKFrame 29325 MOD London but never issued to the military. Now in Exminster Devon, on the road and running well
TRW 29364NA1964Keighley, W Yorks, UKUndergoing Restoration
TRW 29439NA1964re-conditioned in January 1970 at 37 Rhine Workshop, REME, Moenchengladbach, West GermanyErskine, ScotlandIn 1998 it was still bolted to the original base with the grease seal on top of the pistons at TDC still intact.
Now fitted in 29024NA
TRW 29453NA1964OxfordshireRefurbished in RAF colours, as previous owner rode one while in the RAF. Taxed and MOT’d on the road!
TRW 29459NA1964Lincolnshire, UKDismantled
TRW 29556XNA1964Birmingham, Alabama, USA
TRW 29566XNA1964Ex Military Police Bike, Ruddington, UKMaidstone, UKPurchased 20/05/1980 from an Army sale
TRW 29571XNA1964Canada, 10/01/1965Norwich, UKEngine Only
TRW 29579XNATriumph TRW MK3 SV1964MOD (Army)Colchester, Essex, UKOriginal but under restoration
TRW 29386NA1964MOD, 05/12/1964Norwich, UKComplete

Key; Green is MK1, Blue is MK2, Red is MK3, White is unknown at present

Customer Photos of Triumph TRW

Triumph TRW Vancouver Canada
Wayne Dowler’s Triumph TRW in West Vancouver

Air Force Blue Triumph TRW
David Will’s Air Force Blue TRW

Chris Hollis’ TRW in Norwich

John Reilly’s Triumph TRW in it’s original crate at the unveiling day at the SideCar Cafe

Triumph TRW Military Photographs

We love to see old photos, send them in to us and will put them up here.

Triumph TRW Luneburg Heath Germany
Derek Upton on his Triumph TRW on Luneburg Heath, Germany, 1952
Triumph TRW Convoy Germany
Triumph TRW convoy Germany. Derek Upton on the left, Ray Wayman in the centre and Corporal “Big Mac” McRobb (Big Mac used to pick his bike up and place it on the cleaning bench instead of using the ramp). The Rock Apes RAF Regiment
Triumph TRW James Berrow
James Berrow on his TRW in Germany C1952
Triumph TRW Germany
James Berrow on his TRW in Germany C1952

Other Triumph TRW Documents

Triumph TRW 500SV PrototypeTriumph TRW Works Prototype
Above is the Triumph TRW Spring frame prototype, made by Triumph as a demonstrator for the war office in 1957. Photos and info courtesy of Commander CV Hanna AMIMarEST. I MarEng. Royal Navy

The original bike features in the book “It’s a Triumph” by Ivor Davies (Page 110). The bike is now believed to reside in the London Motorcycle Museum.

Commander Hanna now has his own prototype based on the above, See TRW 29155NA on the register.


What Year is My TRW?

Below you can find the year of your bike using the engine numbers.

Engine NumberYear
14401N – 14459N1950
6044NA – 14320NA1951
22001NA – 223838NA1952
22839NA – 23273NA1953
23274NA – 23322NA1954
23323NA – 23597NA1955
23598NA – 25447NA1956
25448NA – 27127NA1957
27128NA – 27175NA1958
27176NA – 27346NA1959
27347NA – 27645NA1960
27646NA – 28185NA1961
28186NA – 28464NA1962
28465NA – 28827NA1963
28828NA – 29605NA1964

Thanks to Chris Hollis for providing this info.

Triumph TRW Technical Specifications

Also see the Triumph TRW MK2 Handbook

in/ex valve dia1.14″
In/ex valve inclination2 from vertical
Compression Ratio6:1
Con-Rod Centres6.5
Spark PlugNGK, B7HS
Gudgeon pin dia.0.625″
Valve Timing:
Inlet Opens BTDC16
Inlet Closes ABDC56
Ex Opens BBDC56
Ex Closes ATDC16
Valve Clearance (time)0
In Valve Clearance(cold)0.002″
Ex Valve Clearance(cold)0.004″
Ignition Timing21
Ignition Timing Piston0.125″
Points Gap0.012″
Valve Seat Angle45
Valve Lift ex/in0.30″
Valve Spring Free Length1.812″
CarburettorSolex Type 26 WH-Z
Primary Chain1/2 x 5/16
Rear Chain5/8 x 3/8
Front Tyre3.25 x 19
Rear Tyre4.00 x 19
Front Brake dia7″
Rear Brake dia7″
Petrol Tank3 (Imp Gal)
3.6 (US Gal)
Oil Tank4 (Imp Pint)
4.8 (US Pint)

Military Dispatch Riders Rubberizd Overcoat

You can now really look the part on your Triumph TRW or other military motorbike with a genuine dispatch riders overcoat.

WW2 Rubberized overcoatGenuine, New WW2 Rubberized Dispatch Riders Coat

Made in 1943 by Victory Garment Manfacturers – Government Contractors

  • Size 11 – Height of man 6’1″ to 6’2″. Breast of man overjacket 41ins to 43ins (other sizes may be available on request)
  • 11849 U/860
  • Leg Straps

Very good condition, never worn.

The back of the jacket comes up to the crotch and is held using press studs. This keeps the rider completely dry. The coat underwent stringent weather testing before being introduced in 1942.

Buy Online Here