Triumph TR7

THE TRIUMPH TR7: BORN OF TROUBLED TIMES
By 1973, Triumph Motorcycles was in serious trouble. Parent company BSA had managed to 'snatch failure from the jaws of success," taking Triumph from incredible success in the late 1960s to the brink of insolvency by 1971. Through bad management, questionable backroom dealings (Jack Sangster sold off all the company assets at bargain-basement prices) and the onslaught of the Japanese (mainly Honda), Triumph suddenly found itself woefully outclassed by its rivals. Throughout the 1960s, the hot Triumph 650 twins, the T110 Tiger, the TR6, and the twin-carb legend Bonneville were widely-regarding as the fastest motorcycles a 'normal person' could buy (ie: not expensive like a Vincent Black Shadow), the superbikes of their day. Then the Honda 750 Four arrived, and suddenly the old vertical twins were losing their relevance. BSA not-so-quickly responded in 1971 with a whole new range of 650 twins, for which they designed virtually everything new except that one major component that needed changing: the engine. Instead, they created an entirely new all-welded steel double front downtube frame which carried the engine oil in its large-diameter backbone/seat post. There were new forks, new wheels & brakes, new bodywork, switchgear, the works. However, the 3 major things the bike really needed to be competitive with the Japanese were painfully absent: Electric start, 5-speeds & a front disk brake.

TRIUMPH TR7 MUCH-IMPROVED
The 1971 Triumph TR6 launched amid major design & development problems - the engine wouldn't fit in the new frame! The entire top end needed to be redesigned to make it work. That wasn't all; the seat height was over 34 inches, too tall for most riders. It took until the 1973 model year for Triumph to sort out what was now called the Triumph TR6 Tiger.

TRIUMPH TR7 750 WITH 5-SPEEDS
In 1973, the Triumph twins & Triples (ie: Triumph Trident) finally got 5-speed transmissions & a front disk brake. 5-speeds had been optional since 1971, but were now standard across the line. While the 649cc TR6 Tiger remained, a new punched-out version was introduced called the TR7 750 Tiger. In fact, these early machines were bored from 71mm out to 75mm for a displacement of 724cc. However, later in the 1973 model year, a new cylinder casting made it possible to increase the bore again to 76mm for a displacement of 744cc. The 82mm stroke remained unchanged on all models.
TRIUMPH TR7 BY THE NUMBERS
Starting in 1971, all single-carb 650 & 750 twins were called "Tigers". Other than a brief one-year appearance in 1960, when the name TR7 was used to describe left-over 1959 Triumph Bonnevilles that were being sold alongside 1960 Bonnevilles. Otherwise, the TR7 name didn't appear again until the 1973 model year as the big-bore single-carb Tiger, as the TR7P (Police) & the TR7RV (Roadster w/5-speed). Early-1973 724cc Triumph TR7RVs had engine & frame numbers running from KH17122 to XH21715. Later 1973 TR7P Police bikes with 744cc ran from GH35388 to GH35466. And the 744cc TR7RVs ran AH23727 to GH35387. From Model-Year 1974 until its demise in 1983, the only single-carb big twins were the Triumph TR7 Tiger, gone forever was the TR6 (with one exception: in 1983, the final year of Triumph production, one last 650 was briefly built under the name Triumph TR65, meant to be an entry-level version.)
ABOVE: What's missing here? Oh yeah, the shifter! This 1976 Triumph TR6 was the first year for left-foot shift. Heresy of heresies!!
TRIUMPH TR7 - RIDING OFF INTO HISTORY
While the twin-carb Bonneville always stole the spotlight, the single-carb 750 Triumph TR7 and its 650 TR6 predecessor was judged by many to be the better bike. While producing marginally less horsepower at max rpm, in real-world practical terms, the Tiger was just as fast at the Bonnie. And the single carburetor delivered much better drivability at low speeds. Two cylinders breathing through one throat makes for higher vacuum & more even pulses, both very good for carburetors. So they pull harder at low engine speeds & in the higher gears when vacuum usually drops. This becomes even more pronounced when you raise your final gearing (lower numerical ratio, ie: smaller rear sprocket). And of course one carb is always easier to tune than two. I've had both, and while people love looking at those twin carbs, the TR7s usually ran better.

Triumph TR7 YEAR-BY-YEAR


1973 Triumph TR7 Tiger 750

First year for the 750, first year for the 5-speed as standard equipment & first year for the front disk brake. Finally sorted out the new "oiler" frame & running gear & it was becoming a very fine machine.


1976 Triumph TR7 Tiger 750

A year of firsts: The first left-shift, the first rear disk brake & the first bikes built by the new Meriden co-op.



MORE TRIUMPH TR6 PAGES:
Triumph TR6
Triumph TR6, Pre-Unit (1956-1962)
.....1956
.....1957
.....1958
.....1959
.....1960
.....1961
.....1962
Triumph TR6, Unit-Construction (1963-1970)
.....1963
.....1964
.....1965
.....1966
.....1967
.....1968
.....1969
.....1970
Triumph TR6, Oil-in-Frame (1971-1972)
.....1971
.....1972
Triumph TR7
.....1973
.....1976

OTHER TRIUMPHS:
Triumph Bonneville
Triumph Trophy
Triumph Tiger
Triumph Thunderbird
Triumph Trident
Triumph X-75 Hurricane



Check out these TRIUMPH BOOKS

COMPLETE BOOK OF CLASSIC & MODERN TRIUMPHS


TRIUMPH MOTORCYCLES IN AMERICA


TRIUMPH MOTORCYCLE RESTORATION


TRIUMPH MOTORCYCLE RESTORATION, PRE-UNIT


TRIUMPH BONNEVILLE & TR6 RESTORATION GUIDE: 1956-1983


TALES OF TRIUMPH MOTORCYCLES & THE MERIDEN FACTORY


TRIUMPH 650 & 750 TWINS OWNERS WORKSHOP MANUAL, 1963-1983


TRIUMPH BONNEVILLE: ESSENTIAL BUYER’S GUIDE


TRIUMPH BONNEVILLE: PORTRAIT OF A LEGEND


ILLUSTRATED TRIUMPH BUYER’S GUIDE, by Roy Bacon


TRIUMPH BONNEVILLE, 2001-2015


TRIUMPH: PRODUCTION TESTERS TALES FROM MERIDEN


TRIUMPH MOTORCYCLE RESTORATION GUIDE


TRIUMPH OWNERS HANDBOOK, UNIT-CONSTRUCTION 350 & 500, Kindle


TRIUMPH ILLUSTRATED WORKSHOP MANUAL 1945-1955, by Clymer


TRIUMPH TWINS & TRIPLES


FACTORY-ORIGINAL TRIUMPH TWINS, 1938-1962


TRIUMPH BONNEVILLE & TR6, by Timothy Remus


TRIUMPH MOTORCYCLES: FROM SPEED TWIN TO BONNEVILLE


TRIUMPH MOTORCYCLES: THEIR RENAISSANCE & THE HINKLEY FACTORY


TRIUMPH PRE-UNIT TWINS OWNERS WORKSHOP MANUAL


TRIUMPH THRUXTON BONNEVILLE 1959-1969


TRIUMPH MOTORCYCLES ILLUSTRATED WORKSHOP MANUAL 1937-1951, by Clymer


TURNER’S TRIUMPHS: EDWARD TURNER & HIS TRIUMPHS


TRIUMPH TWIN RESTORATION, by Roy Bacon


TRIUMPH TIGER CUB & TERRIER 1952-1968, Haynes Repair Manual


TRIUMPH 675 DAYTONA & SPEED TRIPLE REPAIR MANUAL 2006-2010, Haynes


CLASSIC MOTORCYCLES: TRIUMPH


TRIUMPH BONNEVILLE YEAR BY YEAR


TRIUMPH TRIPLES


TRIUMPH RACING MOTORCYCLES IN AMERICA


TRIUMPH MOTORCYCLES


TRIUMPH, by Roy Bacon


TRIUMPH 750/900 TRIPLES & 1200 FOURS 1991-1999, Haynes Repair Manual


TRIUMPH TROPHY BIBLE


TRIUMPH DAYTONA, SPEED TRIPLE SPRINT & TIGER: 885/955 1997-2005, Haynes Repair Manual


BSA & TRIUMPH TRIPLES GOLD PORTFOLIO 1968-1976


TRIUMPH TRIDENT OWNERS WORKSHOP MANUAL, by Haynes


TRIUMPH: A CENTURY OF PASSION & POWER


TRIUMPH BONNEVILLE, by Osprey


TRIUMPH TIGER 100 & 110, 1939-1961, by Roy Bacon


TRIUMPH TIGER 100 & DAYTONA


TRIUMPH BONNEVILLE, by Crowood


TRIUMPH by Don Morley


TRIUMPH TRIPLES & FOURS 1991 & 2004


TRIUMPH 350 & 500 1957-1974 ESSENTIAL BUYERS GUIDE


BONNIE: THE DEVELOPMENT OF THE TRIUMPH BONNEVILLE


TRIUMPH SINGLES: EARLY DAYS TO 1974, by Roy Bacon


TRIUMPH: RETURN OF THE LEGEND


TRIUMPH FUEL INJECTED TRIPLES 1997-2000


BOOK OF TRIUMPH TWINS 1968-1969, by Floyd Clymer


THE TRIUMPH STORY: RACING & PRODUCTION MODELS 1902-PRESENT


TRIUMPH 350 & 500 TWINS 1958-1973, Haynes Repair Manual


TRIUMPH BONNEVILLE 2001-=2008 ROAD TEST PORTFOLIO


HINKLEY TRIPLES & FOURS


TRIUMPH PRE-UNIT TWINS


HINKLEY TRIUMPHS: THE FIRST GENERATION


TRIUMPH BONNEVILLE BIBLE: ALL MODELS 1959-1983


TRIUMPH TWENTY-ONE TO DAYTONA: C CLASS 350 & 500 TWINS


ORIGINAL TRIUMPH BONNEVILLE


TRIUMPH 650 & 750 TWINS


TRIUMPH MOTORCYCLES & CUSTOM BIKES


TRIUMPH MOTORCYCLES


TRIUMPH, THE LEGENDS SERIES


TRIUMPH THUNDERBIRD SUPER PROFILE


TRIUMPH SPEED TWIN & THUNDERBIRD BIBLE


TRIUMPH BONNEVILLE T120/T140


TRIUMPH MOTORCYCLES FROM 1950-1983


TRIUMPH & BSA TRIPLES: THE COMPLETE STORY


TRIUMPH THUNDERBIRD, TROPHY & TIGER ESSENTIAL BUYERS GUIDE


TRIUMPH TIGER CUB BIBLE


ROAD RACING HISTORY OF THE TRIUMPH 500 UNIT TWIN


EDWARD TURNER: THE MAN BEHIND THE MOTORCYCLES


SAVE THE BONNEVILLE: THE INSIDE STORY OF THE MERIDEN WORKERS CO-OP


TRIUMPH DAYTONA 1991-2006 ROAD TEST PORTFOLIO


TRIUMPH DAYTONA 2003-2009 ROAD TEST PORTFOLIO


TRIUMPH TIGER 100 / DAYTONA: DEVELOPMENT HISTORY


TRIUMPH, by Daniel Gilpin


BOOK OF TRIUMPH MOTORCYCLES ILLUSTRATED SHOP MANUAL 1935-1939


TRIUMPH: THE RACING STORY


TRIUMPH BONNEVILLE T120 1959-1974, by Roy Bacon


TRIUMPH BONNEVILLE GOLD PORTFOLIO 1959-1983


TRIUMPH TRIDENT SUPER PROFILE


ILLUSTRATED TRIUMPH BUYERS GUIDE, by Roy Bacon






Please visit our
MOTORCYCLE BOOK STORE


Take a tour of our site...

HOME PAGE
Triumph Motorcycles
.....Bonneville
.....Tiger
.....Trophy
.....TR6
.....TR7
.....Trident
.....X-75 Hurricane
.....6T Thunderbird
.....5T Speed Twin
.....Daytona
.....Twenty-One
BSA Motorcycles
.....A65
.....A10
.....A7
.....Gold Star
.....Bantam
.....Rocket 3
Norton Motorcycles
.....Commando
.....Atlas
.....Dominator
.....Manx
Matchless-AJS Motorcycles
.....G3
.....G9
.....G12
.....G80
AMC-Associated Motor Cycles
Royal Enfield Motorcycles
.....Interceptor
.....Bullet
Ariel Motorcycles
.....Square Four
.....Red Hunter
Vincent Motorcycles
.....Black Shadow
.....Comet
Velocette Motorcycles
.....KSS
.....LE
.....MAC
.....Thruxton
Rickman Motorcycles
Japanese Motorcycles
.....Honda
.....Kawasaki
.....Suzuki
.....Yamaha
Cafe Racers
....Triumph Cafe Racers
.....Norton Cafe Racers
.....Other Cafe Racers
Choppers & Bobbers
.....Choppers
.....Triumph Choppers
.....BSA Choppers
.....Rat Bikes
Classic Racing Motorcycles

Classic Motorcycle Events
.....Auctions
.....Shows
.....Rides
Classic Motorcycle Restoration
Classic Motorcycle Shops
Classic Motorcycle Clubs
Classic Motorcycle Photo Gallery
Send us Pictures of YOUR BIKE
YOUR BIKE Pictures

HOME PAGE
.....About Us
.....Site Map
.....CONTACT US
.....Please visit our BLOG
.....Subscribe to our FREE e-zine BRIT IRON
.....BRIT IRON E-zine Back Issues

Visit our STORE
.....Motorcycle Books
.....Motorcycle Magazines
.....Motorcycle Calendars
.....Motorcycle Helmets
.....GoPro Cameras

Crazy about cars, too? Check out our sister site:
www.American-Muscle-Cars.net

Back to top - Triumph TR7
5/7/16

Learn how to BUILD YOUR OWN WEBSITE, like I did.

2016 CALENDARS


Please visit our
MOTORCYCLE BOOK STORE


Subscribe to your favorite
MOTORCYCLE MAGAZINES





We now sell
GoPro CAMERAS




BIKES FOR SALE!
Check out our
FREE
Classifed Ads


Get your next
MOTORCYCLE HELMET
here


NEW PAGES
added this month:

1934 BSA Blue Star
Triumph T140W TSS
1955 Matchless G9B
1963 Matchless G12CS
Triumph Daytona
1967 Triumph Daytona
1968 Triumph Daytona
1969 Triumph Daytona
1970 Triumph Daytona
1973 Triumph Daytona
2009 Triumph Bonneville Thruxton
Triumph Twenty-One
1959 Triumph Twenty-One
1960 Triumph Twenty-One
1961 Triumph Twenty-One
Norton Navigator
1962 Norton Navigator
1962 Norton Navigator Deluxe
Norton Jubilee
1970 Norton Mercury
1964 Norton Atlas
1962 Norton Dominator 650SS
1969 Norton Dominator 650SS
Enjoy. More coming soon...