2021 Triumph Bonneville Speedmaster Specifications

Name: 2021 Triumph Bonneville Speedmaster
Brand: Triumph

Custom / cruiser • Specs last verified 13 July 2026

No images available

Tap to enlarge

2021 Triumph Bonneville Speedmaster Overview

Triumph Bonneville Speedmaster is a custom / cruiser motorcycle, displacing 1198 cc. Power comes from a Four stoke, parallel twin, 270° crank angle, SOHC, 4 valve per cylinder engine, a compression ratio of 10.0:1. On the performance side, it delivers 57.5 kW @ 6100 rpm of peak power and 106 Nm @ 4000 rpm of torque. On the road, the 2021 Bonneville Speedmaster tips the scales at 263 kg, carries a 12-litre fuel tank, offers a seat height of 705 mm and spans a 1500 mm wheelbase. That's roughly 37.6 kg lighter than the average custom / cruiser motorcycle in our database. The full 2021 Triumph Bonneville Speedmaster spec sheet below covers every technical detail, from suspension travel to tyre sizes.

2021 Bonneville Speedmaster - Pros & Cons

Strengths

Strong power output: With 57.5 kW @ 6100 rpm and 106 Nm @ 4000 rpm of torque on tap, the Bonneville Speedmaster is no slouch for its class.
Fuel injection: Fuel injection means consistent cold starts and clean throttle response without the fussiness of a carbureted setup.
Accessible seat height: A 705 mm seat height keeps this manageable for most riders, which helps confidence at parking-lot speeds.

Considerations

Modest fuel capacity: Range between stops is limited by the 12-litre tank - plan fuel stops accordingly on longer routes.
Chain final drive upkeep: Budget time for routine chain maintenance - it's cheap to replace but needs consistent attention to avoid premature sprocket wear.

Wear Points & Servicing Notes

Cooling system servicing

Bonneville Speedmaster's Liquid cooled setup is low-maintenance provided the coolant interval is kept - old, acidic coolant is the main cause of long-term corrosion in the water passages.

Fuelling & injector care

The Multipoint sequential electronic fuel injection on the Bonneville Speedmaster needs little beyond good fuel and periodic use of an injector-cleaner additive - no jetting or float-bowl maintenance to worry about.

Brake disc and pad wear

Braking up front comes from 2 x 310mm disc, Brembo 2-piston sliding axial calipers - solid stopping power, with disc and pad wear best checked on the same schedule as tyre changes.

Suspension condition on used examples

The Bonneville Speedmaster's suspension runs 47 mm Showa cartridge forks at the front. The rear uses Mono-shock RSU with linkage and preload adjustment. Fork-seal condition and rear linkage play are the two things worth checking before buying used.

Final drive maintenance

The Bonneville Speedmaster uses chain final drive, which is cheap to replace but needs regular cleaning, lubrication and tension checks to get a full service life out of the sprockets.

Frame & chassis check

Built around a Tubular steel, twin cradle frame, the Bonneville Speedmaster's chassis is straightforward to inspect: look for corrosion, cracks or repair welds around stress points like the head-stock and swingarm mounts.

Handling the weight at a standstill

263 kg puts the Bonneville Speedmaster toward the heavier end of its class. It's most noticeable at walking pace; once underway the mass settles into the handling rather than fighting it.

Bonneville Speedmaster - Buying & Maintenance Guide

What to check before buying

Before handing over money for a used 2021 Triumph Bonneville Speedmaster, cover the fundamentals: service book and oil change history, chain and sprocket wear, and any sign of oil weeping around the casings. Cold-starting it yourself tells you a lot - a healthy Bonneville Speedmaster should catch quickly and settle into a smooth idle.

Oil and filter changes

Nothing protects a Bonneville Speedmaster's engine like disciplined oil changes - stay on the manufacturer's schedule (roughly every 6,000 km or annually). Match the viscosity grade to what the owner's manual specifies, not what's cheapest.

Fuel system care

Fuel injection on the Bonneville Speedmaster needs little attention beyond decent fuel and an occasional system-cleaner additive. Anything left standing for three months or more should have its fuel drained and replaced before it varnishes the injectors.

2021 Triumph Bonneville Speedmaster - Frequently Asked Questions

What engine does the 2021 Triumph Bonneville Speedmaster have?

The 2021 Triumph Bonneville Speedmaster 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 Speedmaster weigh?

The 2021 Triumph Bonneville Speedmaster weighs 263 kg. This is the manufacturer's wet figure.

How much power does the 2021 Triumph Bonneville Speedmaster make?

The 2021 Triumph Bonneville Speedmaster 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 Speedmaster?

The 2021 Triumph Bonneville Speedmaster 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 Speedmaster suitable for shorter riders?

The 2021 Triumph Bonneville Speedmaster has a seat height of 705 mm. This is a comfortable, accessible height for most riders.

What brakes does the 2021 Triumph Bonneville Speedmaster have?

The 2021 Triumph Bonneville Speedmaster uses 2 x 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 Speedmaster use?

The 2021 Triumph Bonneville Speedmaster runs 130/90-16 front and 150/80-16 rear tyres. A good selection of sport, touring and all-weather rubber is available in these sizes.

What gearbox does the 2021 Triumph Bonneville Speedmaster have?

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

Triumph Bonneville Speedmaster Spec Evolution

The Triumph Bonneville Speedmaster 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 @ 6000 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	705 mm / 27.7 in	705 mm / 27.7 in	705 mm / 27.8 in	705 mm / 27.8 in
Fuel Capacity	12 Litres / 3.17 US gal	12 Litres / 3.17 US gal	12 Litres / 3.2 US gal	14 Litres / 3.7 US gal
Displacement	1198 cc / 73.1 cu in	1198 cc / 73.1 cu in	1198 cc / 73.1 cu in	1198 cc / 73.1 cu-in
Frame Type	Dual tubular steel cradle	Dual tubular steel cradle	Tubular steel, twin cradle frame	Tubular steel, twin cradle frame
Brakes - Front	2 x 310 mm Disc, 2 piston calipers, ABS	2 x 310 mm Disc, 2 piston calipers, ABS	2 x 310mm disc, Brembo 2-piston sliding axial calipers	2 x 310mm disc, Brembo 2-piston floating calipers, OCABS
Brakes - Rear	Single 255 mm disc, 2 piston caliper, ABS	Single 255 mm disc, 2 piston caliper, ABS	Single 255mm disc, Nissin single piston sliding axial caliper	Single 255mm disc, Nissin single piston sliding 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

263 kg / 580 lbs

Fuel Capacity

12 Litres / 3.2 US gal

Full 2021 Triumph Bonneville Speedmaster Specifications

Year 2021

Make Model Triumph Bonneville Speedmaster

Seat Height 705 mm / 27.8 in

Wheelbase 1500 mm / 59.1 in

Height 1055 mm /41.5 in

Length 2225 mm / 87.6 in

Width 910 mm / 35.8 in

Fuel Capacity 12 Litres / 3.2 US gal

Wet Weight 263 kg / 580 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 Chromed stainless steel 2 into 2 twin-skin exhaust system with chromed 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 and preload adjustment

Rake 25.3°

Swingarm Twin sided fabrication

Trail 91.4 mm / 3.6 in

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

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

ABS Standard

Tyres - Front 130/90-16

Tyres - Rear 150/80-16

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.