2021 Triumph Bonneville Bobber Specifications

Name: 2021 Triumph Bonneville Bobber
Brand: Triumph

Naked bike • Specs last verified 13 July 2026

No images available

Tap to enlarge

2021 Triumph Bonneville Bobber Overview

For 2021, Triumph offers the Bonneville Bobber as a naked bike motorcycle with 1198 cc on tap. The 2021 Triumph Bonneville Bobber is built around a Four stoke, parallel twin, 270° crank angle, SOHC, 4 valve per cylinder engine, a compression ratio of 10.0:1. Out on the road, the Bonneville Bobber delivers 57.5 kW @ 6100 rpm of peak power and 106 Nm @ 4000 rpm of torque. In everyday use, the 2021 Bonneville Bobber tips the scales at 251 kg, carries a 12-litre fuel tank, offers a seat height of 690 - 700 mm and spans a 1500 mm wheelbase. That's roughly 42.5 kg heavier than the average naked bike motorcycle in our database. Every technical detail, from suspension travel to tyre sizes, is covered in the full 2021 Triumph Bonneville Bobber spec sheet below.

2021 Bonneville Bobber - Pros & Cons

Strengths

Strong power output: Peak output on the Bonneville Bobber is 57.5 kW @ 6100 rpm and 106 Nm @ 4000 rpm of torque - strong numbers for what it is.
Fuel injection: No choke, no jetting, no altitude compensation to think about - fuel injection just works across a wider range of conditions than carburetion.
Accessible seat height: At just 690 - 700 mm, flat-footing at a stop is easy for most riders - a genuine confidence builder for less experienced owners.

Considerations

Modest fuel capacity: A 12-litre tank keeps things light but means budgeting for more frequent fuel stops on any longer ride.
Chain final drive upkeep: A chain drivetrain is the most common setup in its class, but it's also the one that demands the most regular hands-on maintenance.

Wear Points & Servicing Notes

Cooling system servicing

With Liquid cooled, thermal management is largely automatic, but the coolant has a service life of its own - replace it on the manufacturer's interval to protect the water passages and thermostat.

Fuelling & injector care

Fuelling on the Bonneville Bobber comes from Multipoint sequential electronic fuel injection. Cold starts and throttle response stay consistent across altitude and temperature, the main practical edge over a carbureted equivalent.

Brake disc and pad wear

2x 310mm disc, Brembo 2-piston sliding axial calipers up front provides the primary stopping power; inspect disc thickness and pad wear at each tyre change to catch scoring before it becomes a rotor replacement.

Suspension condition on used examples

Suspension duties are handled by 47 mm Showa cartridge forks up front and Mono-shock RSU with linkage at the rear. Weeping fork seals aren't a dealbreaker on a used bike, but they're a fair basis for negotiating price.

Final drive maintenance

Chain final drive on the Bonneville Bobber means routine lubing and tension checks are part of ownership - skip them and sprocket wear accelerates noticeably.

Frame & chassis check

The Tubular steel, twin cradle frame chassis holds up well with normal use; on a used bike it's still worth checking the head-stock and swingarm pivot area for impact damage or corrosion.

Handling the weight at a standstill

The Bonneville Bobber's 251 kg kerb weight is worth factoring into how you handle it at a standstill - parking-lot manoeuvres need a bit more deliberate technique than on a lighter machine.

Bonneville Bobber - Buying & Maintenance Guide

What to check before buying

A pre-purchase check on the 2021 Triumph Bonneville Bobber should cover the same ground every time: service history, chain and sprocket condition, and any oil seepage around the casings. Start it from cold if you can - a well-kept Bonneville Bobber settles to a smooth idle within seconds.

Oil and filter changes

Oil changes are the cheapest insurance you can buy for a Bonneville Bobber's engine - keep to the manufacturer's interval rather than stretching it. Use the viscosity grade the manual specifies, not whatever's on sale.

Fuel system care

Injector systems like the Bonneville Bobber's hold up well with basic care - decent fuel, an occasional cleaner additive, and draining old fuel before any layup longer than three months.

2021 Triumph Bonneville Bobber - Frequently Asked Questions

What engine does the 2021 Triumph Bonneville Bobber have?

The 2021 Triumph Bonneville Bobber uses a Four stoke, parallel twin, 270° crank angle, SOHC, 4 valve per cylinder engine with 1198 cc of displacement. It is liquid cooled.

How much does the 2021 Triumph Bonneville Bobber weigh?

The 2021 Triumph Bonneville Bobber weighs 251 kg. This is the manufacturer's wet figure.

How much power does the 2021 Triumph Bonneville Bobber make?

The 2021 Triumph Bonneville Bobber produces 57.5 kW @ 6100 rpm of power and 106 Nm @ 4000 rpm of torque. These are peak figures.

What is the fuel tank capacity of the 2021 Triumph Bonneville Bobber?

The 2021 Triumph Bonneville Bobber has a 12-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 200-240 km between stops.

Is the 2021 Triumph Bonneville Bobber suitable for shorter riders?

The 2021 Triumph Bonneville Bobber has a seat height of 690 - 700 mm. This is a comfortable, accessible height for most riders.

What brakes does the 2021 Triumph Bonneville Bobber have?

The 2021 Triumph Bonneville Bobber uses 2x 310mm disc, Brembo 2-piston sliding axial calipers at the front and Single 255mm disc, Nissin single piston sliding axial caliper at the rear.

What tyre sizes does the 2021 Triumph Bonneville Bobber use?

The 2021 Triumph Bonneville Bobber runs 130/90 B16 front and 150/80 R16 rear tyres. A good selection of sport, touring and all-weather rubber is available in these sizes.

What gearbox does the 2021 Triumph Bonneville Bobber have?

The 2021 Triumph Bonneville Bobber is fitted with a 6-Speed transmission.

Triumph Bonneville Bobber Spec Evolution

The Triumph Bonneville Bobber was produced across 4 model years (2018-2026). 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	2018	2020	2021	2026
Max Power	57.4 kW / 77 hp @ 6550 rpm	57.4 kW / 77 hp @ 6550 rpm	57.5 kW / 76.9 hp @ 6100 rpm	57.5 kW / 76.9 hp @ 6100 rpm
Engine Detail	Four stoke, parallel twin, 270o crank, SOHC	Four stoke, parallel twin, 270o crank, SOHC	Four stoke, parallel twin, 270° crank angle, SOHC, 4 valve per cylinder	Four stoke, parallel twin, 270° crank angle, SOHC, 4 valve per cylinder
Seat Height	690 mm / 27.2 in	690 mm / 27.2 in	690 - 700 mm / 27.2 - 27.6 in	683 mm / 26.9 in
Fuel Capacity	10.6 Litres / 2.8 US gal / 3.2 Imp gal	10.6 Litres / 2.8 US gal / 3.2 Imp gal	12 Litres / 3.2 US gal	14 Litres / 3.7 US gal
Frame Type	Dual tubular steel cradle	Dual tubular steel cradle	Tubular steel, twin cradle frame	Tubular steel, twin cradle frame
Wheelbase	1510 mm / 59.4 in	1510 mm / 59.4 in	1500 mm / 59.1 in	1486 mm / 58.5 in
Brakes - Front	Single 310 mm disc, 2 piston floating Nissen calipers, ABS	Single 310 mm disc, 2 piston floating Nissen calipers, ABS	2x 310mm disc, Brembo 2-piston sliding axial calipers	2x 310mm disc, Brembo 2-piston sliding axial calipers
Brakes - Rear	Single 255 mm disc, 2 piston floating Nissen caliper, ABS	Single 255 mm disc, 2 piston floating Nissen caliper, ABS	Single 255mm disc, Nissin single piston sliding axial caliper	Single 255mm disc, Nissin single piston sliding axial caliper OCABS

Key Specifications

Engine

Four stoke, parallel twin, 270° crank angle, SOHC, 4 valve per cylinder

Power

57.5 kW / 76.9 hp @ 6100 rpm

Torque

106 Nm / 78.2 lb-ft @ 4000 rpm

Top Speed

Not published by manufacturer

Weight

251 kg / 553 lbs

Fuel Capacity

12 Litres / 3.2 US gal

Full 2021 Triumph Bonneville Bobber Specifications

Year 2021

Make Model Triumph Bonneville Bobber

Seat Height 690 - 700 mm / 27.2 - 27.6 in

Wheelbase 1500 mm / 59.1 in

Height 1024 - 1055 mm / 40.3 - 41.5 in

Length 1024 - 1055 mm / 40.3 - 41.5 in

Width 800 mm / 31.5 in

Fuel Capacity 12 Litres / 3.2 US gal

Wet Weight 251 kg / 553 lbs

Max Power 57.5 kW / 76.9 hp @ 6100 rpm

Max Torque 106 Nm / 78.2 lb-ft @ 4000 rpm

Displacement 1198 cc / 73.1 cu in

Engine Detail Four stoke, parallel twin, 270° crank angle, SOHC, 4 valve per cylinder

Bore x Stroke 97.6 x 80 mm

Compression Ratio 10.0:1

Cooling System Liquid cooled

Emissions EURO5

Exhaust Brushed stainless steel 2 into 2 twin-skin exhaust system with brushed stainless silencers

Fuel Induction Multipoint sequential electronic fuel injection

Ignition Digital

Lubrication Wet sump

Clutch Wet, multi-plate, torque assist clutch

Final Drive Chain

Transmission / Drive 6-Speed

Frame Type Tubular steel, twin cradle frame

Suspension - Front 47 mm Showa cartridge forks

Suspension - Rear Mono-shock RSU with linkage

Rake 25.4°

Swingarm Twin sided fabrication

Trail 92.0 mm / 3.6 in

Wheel Travel - Front 90 mm / 3.5 in

Wheel Travel - Rear 73 mm / 2.8 in

Brakes - Front 2x 310mm disc, Brembo 2-piston sliding axial calipers

Brakes - Rear Single 255mm disc, Nissin single piston sliding axial caliper

ABS Standard

Tyres - Front 130/90 B16

Tyres - Rear 150/80 R16

Wheels - Front Wire 32-spoke, 16 x 2.5 in

Wheels - Rear Wire 32-spoke, 16 x 3.5 in

Specifications are compiled from manufacturer documentation and cross-referenced technical sources, and corrected on an ongoing basis. Spot an error? Let us know.