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– 2003 Triumph Bonneville
The sheer simplicity of the Bonneville form, matched to Triumph’s modern engineering integrity has introduced a whole new generation to the charms of one of motorcycling’s most enduring icons. And to add further authenticity to the Bonneville legend, Triumph has kept the ‘Bonnie’ as true to its 50’s roots as a modern masterpiece deserves.
Traditional parallel twin power doesn’t come any punchier or more refined than that of the 790cc Bonneville unit. Equipped with a 360 degree crankshaft to reproduce the classic engine beat of a British twin (where both pistons rise and fall together), there’s plenty of power (61bhp at 7400rpm) and a remarkable 90 per cent of peak torque (60Nm) from 2750rpm all the way to the redline. Twin balancer-shafts keep vibration to a minimum and further refine the relaxed riding experience.
The engine is fed by twin 36mm carburettors with throttle-position sensors, electrically-heated, while the exhaust system employs secondary air-injection to keep emissions low and exits via traditional twin ‘peashooter’ silencers. The unmistakably Triumph triangular engine cover and left-side clutch case remain brushed and lacquered for 2003.
Sure-footed at speed, yet easy-steering and manoeuvrable around town, the low centre of gravity and minimal 775mm (30.5in) seat height allow the rider to get the best from the light yet substantial tubular steel double cradle frame and box-section swing-arm.
With modern rubber mounted on a 19 inch front and 17 inch rear wheel, and with disc brakes front and rear, the outwardly traditional chassis can more than cope with the modern levels of performance meted out by the motor. In fetchingly simple single-tone tank colours for 2003, the authentic answer to tradition matched to the modern age is a purer experience than ever.
Silencers (for off-road use only)
Alarm/Immobiliser (Thatcham Category MC1 compliant)
Colour Co-ordinated Fly Screen
King and Queen Seat
Low Sissy Bar
High Sissy Bar
Chrome Cam Cover
Chrome Lifter Arm Cover
Chrome Chain Guard
Chrome Side Panels
Chrome Front Mudguard
Chrome Engine Covers
Chrome Headlight Brackets
Various Tank Badges
Chrome Side Stand
34PS Restrictor Kit
Auxiliary Power Socket
Type Air-cooled, DOHC, parallel twin, 360° firing interval
Bore/Stroke 86 x 68mm
Compression Ratio 9.2:1
Fuel System Twin carburettors, with throttle position sensor and electric carburettor heaters
Ignition Digital – inductive type
Primary Drive Gear
Final Drive X ring chain
Clutch Wet, multi-plate
Frame Tubular steel cradle
Swingarm Twin-sided, tubular steel
Wheels Front Spoked, 19 x 2.5in
Rear Spoked, 17 x 3.5in
Tyres Front 100/90 R 19
Rear 130/80 R 17
Suspension Front 41mm forks
Rear Chromed spring twin shocks with adjustable preload
Brakes Front Single 310mm disc, 2 piston caliper
Rear Single 255mm disc, 2 piston caliper
Length 2250mm (88.6in)
Width (Handlebars) 860mm (33.8in)
Height 1105mm (43.5in)
Seat Height 775mm (30.5in)
Wheelbase 1493mm (58.8in)
Dry Weight 205kg (451lb)
Fuel Tank Capacity 16 litres (4.2 gal US)
(Measured at crankshaft to DIN 70020)
Maximum Power 62PS (61bhp) at 7,400rpm
Maximum Torque 60Nm (44.3ft.lbf) at 3,500rpm
Warranty 2 years, unlimited mileage
Service Intervals 4000 miles or one year, whichever comes first