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2020 Triumph Rocket 3 GT Overview
The 2020 Triumph Rocket 3 GT is a custom / cruiser motorcycle built around 2458 cc of displacement. Under the tank sits a Four stroke, inline 3-cylinder, DOHC engine, a compression ratio of 10.8:1. 2020 Triumph Rocket 3 GT delivers 123 kW @ 6000 rpm of peak power and 221 Nm @ 4000 rpm of torque. From a practical standpoint, the 2020 Rocket 3 GT tips the scales at 294 kg, carries a 18-litre fuel tank, offers a seat height of 750 mm and spans a 1677 mm wheelbase. That's roughly 6.6 kg lighter than the average custom / cruiser motorcycle in our database. Scroll down for the complete 2020 Triumph Rocket 3 GT spec sheet covering every technical detail from suspension travel to tyre sizes.
2020 Rocket 3 GT - Pros & Cons
Strengths
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Strong power output: 2020 Triumph Rocket 3 GT makes 123 kW @ 6000 rpm with 221 Nm @ 4000 rpm of torque - competitive figures for its class.
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Accessible seat height: At 750 mm, the seat height is approachable for a wide range of rider heights and builds confidence in low-speed manoeuvring.
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Large fuel range: The 18-litre tank is generously sized, translating to extended range between stops - ideal for touring or longer commutes.
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Low-maintenance final drive: Shaft, bevel box final drive means no chain to clean, lube or adjust - meaningfully less routine maintenance than a chain-driven equivalent.
Considerations
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Age-related wear: As with any used Rocket 3 GT, a thorough pre-purchase inspection covering consumables, service history and tyres is always recommended.
Wear Points & Servicing Notes
Cooling system servicing
The Liquid cooled system on the Rocket 3 GT needs a coolant change roughly every two years (or per the service schedule) - skipping it lets the coolant turn acidic and corrode the aluminium water passages over time.
Brake disc and pad wear
The 2x 320 mm discs w/ Brembo M4.30 Stylema 4-piston radial monobloc calipers, Cornering ABS front brake gives strong, progressive stopping power. Disc thickness and pad depth are worth checking at every tyre change, since worn pads can score the disc surface.
Suspension condition on used examples
Up front, the Rocket 3 GT runs Showa 47mm upside-down 1+1 cartridge front forks, compression and rebound adjuster and Fully adjustable Showa piggyback reservoir RSU with remote hydraulic preload adjuster at the rear. On a used example, check fork seals for weeping oil and test the rear linkage for play - seals are a relatively cheap fix but useful when negotiating price.
Final drive maintenance
Final drive is by shaft - no chain or belt maintenance at all, though the drive-shaft oil should be changed on the manufacturer's interval.
Frame & chassis check
The frame is Full aluminum frame - worth a visual check for corrosion or impact damage around the head-stock and swingarm pivot on any used example, since frame damage is far costlier to fix than any service item.
Handling the weight at a standstill
At 294 kg, the Rocket 3 GT is a substantial machine - low-speed manoeuvring in car parks takes more physical effort than on a lighter bike, though the weight disappears once rolling.
Rocket 3 GT - Buying & Maintenance Guide
What to check before buying
When inspecting a used 2020 Triumph Rocket 3 GT, start with the basics: check the service book for oil change frequency, inspect the chain and sprockets for wear, and look for oil seepage around the engine casings and rocker covers. A cold start test is invaluable - a well-maintained Rocket 3 GT should fire up cleanly and settle to a smooth idle within a few seconds.
Oil and filter changes
Regular oil changes are the single most important maintenance task on any Rocket 3 GT. Stick to the manufacturer's interval - typically every 6,000 km or once a year, whichever comes first. Always use the correct viscosity grade as specified in the owner's manual.
Fuel system care
The Rocket 3 GT's fuel injection system is durable but benefits from quality fuel and the occasional use of a fuel-system cleaner additive. If the bike has been stored for more than three months, drain and replace the fuel to prevent varnish deposits in the injectors.
2020 Triumph Rocket 3 GT - Frequently Asked Questions
What engine does the 2020 Triumph Rocket 3 GT have?
The 2020 Triumph Rocket 3 GT uses a Four stroke, inline 3-cylinder, DOHC engine with 2458 cc of displacement. It is liquid cooled.
How much does the 2020 Triumph Rocket 3 GT weigh?
The 2020 Triumph Rocket 3 GT weighs 294 kg. This is the manufacturer's dry figure.
How much power does the 2020 Triumph Rocket 3 GT make?
The 2020 Triumph Rocket 3 GT produces 123 kW @ 6000 rpm of power and 221 Nm @ 4000 rpm of torque. These are peak figures.
What is the fuel tank capacity of the 2020 Triumph Rocket 3 GT?
The 2020 Triumph Rocket 3 GT has a 18-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 300-360 km between stops.
Is the 2020 Triumph Rocket 3 GT suitable for shorter riders?
The 2020 Triumph Rocket 3 GT has a seat height of 750 mm. This is a comfortable, accessible height for most riders.
What brakes does the 2020 Triumph Rocket 3 GT have?
The 2020 Triumph Rocket 3 GT uses 2x 320 mm discs w/ Brembo M4.30 Stylema 4-piston radial monobloc calipers, Cornering ABS at the front and Single 300mm disc, Brembo M4.32 4-piston monobloc caliper, Cornering ABS at the rear.
What tyre sizes does the 2020 Triumph Rocket 3 GT use?
The 2020 Triumph Rocket 3 GT runs 150/80 R17 V front and 240/50 R16 V rear tyres. A good selection of sport, touring and all-weather rubber is available in these sizes.
What gearbox does the 2020 Triumph Rocket 3 GT have?
The 2020 Triumph Rocket 3 GT is fitted with a 6 Speed transmission.
Triumph Rocket 3 GT Spec Evolution
The Triumph Rocket 3 GT was produced across 2 model years (2020-2024). The table below highlights the key specifications that changed across the production run - useful whether you are comparing years or tracking down a specific variant.
| Specification |
2020 |
2024 |
| Max Power |
123 kW / 167 PS / 165 hp @ 6000 rpm |
134 kW / 180 hp @ 7000 rpm |
| Seat Height |
750 mm / 29.7 in |
750 mm / 29.5 in |
| Fuel Capacity |
18 Litres / 4.7 US gal |
18 Litres / 4.76 US gal |
| Displacement |
2458 cc / 150 cub in |
2458 cc / 150 cu-in |
| Brakes - Front |
2x 320 mm discs w/ Brembo M4.30 Stylema 4-piston radial monobloc calipers, Cornering ABS |
2x 320 mm discs with Brembo M4.30 Stylema 4-piston radial monobloc calipers |
| Brakes - Rear |
Single 300mm disc, Brembo M4.32 4-piston monobloc caliper, Cornering ABS |
Single 300mm disc, Brembo M4.32 4-piston monobloc caliper |
| Suspension - Front |
Showa 47mm upside-down 1+1 cartridge front forks, compression and rebound adjuster. |
Showa 47mm upside-down 1+1 cartridge front forks, compression and rebound adjustement |
| Suspension - Rear |
Fully adjustable Showa piggyback reservoir RSU with remote hydraulic preload adjuster |
Fully adjustable Showa piggyback reservoir RSU with remote hydraulic preload adjustement |
Key Specifications
Engine
Four stroke, inline 3-cylinder, DOHC
Power
123 kW / 167 PS / 165 hp @ 6000 rpm
Torque
221 Nm / 163 ft-lb @ 4000 rpm
Top Speed
Not published by manufacturer
Fuel Capacity
18 Litres / 4.7 US gal
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Full 2020 Triumph Rocket 3 GT Specifications
Year
2020
Make Model
Triumph Rocket 3 GT
Seat Height
750 mm / 29.7 in
Wheelbase
1677 mm / 66 in
Height
1066 mm / 41.5 in - Without Mirrors
Width
886 mm / 34.8 in - Handlebars
Dry Weight
294 kg / 648 lbs
Fuel Capacity
18 Litres / 4.7 US gal
Displacement
2458 cc / 150 cub in
Engine Detail
Four stroke, inline 3-cylinder, DOHC
Bore x Stroke
110.2 x 85.9 mm
Compression Ratio
10.8:1
Cooling System
Liquid cooled
Exhaust
Stainless 3-into-1 headers with 3 exit silencer / CAT box
Fuel Induction
Ride-by-Wire, fuel injected
Ignition
Digital inductive type via electronic engine management
Lubrication
Wet sump
Starter
Electric
Clutch
Wet, multi-plate hydraulically operated, torque assist
Final Drive
Shaft, bevel box
Transmission / Drive
6 Speed
Frame Type
Full aluminum frame
Suspension - Front
Showa 47mm upside-down 1+1 cartridge front forks, compression and rebound adjuster.
Suspension - Rear
Fully adjustable Showa piggyback reservoir RSU with remote hydraulic preload adjuster
Rake
27.9°
Swingarm
Single-sided, cast aluminum
Trail
134.9 mm / 5.3 in
Wheel Travel - Front
120 mm / 4.7 in
Wheel Travel - Rear
107 mm / 4.2 in
Brakes - Front
2x 320 mm discs w/ Brembo M4.30 Stylema 4-piston radial monobloc calipers, Cornering ABS
Brakes - Rear
Single 300mm disc, Brembo M4.32 4-piston monobloc caliper, Cornering ABS
Tyres - Front
150/80 R17 V
Tyres - Rear
240/50 R16 V
Wheels - Front
17 x 3.5 in cast aluminium
Wheels - Rear
16 x 7.5 in cast aluminium
Specifications are compiled from manufacturer documentation and cross-referenced
technical sources, and corrected on an ongoing basis.
Spot an error? Let us know.
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