2018 Triumph Bonneville Speedmaster Specifications

Name: 2018 Triumph Bonneville Speedmaster
Brand: Triumph

Custom / cruiser • Specs last verified 13 July 2026

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2018 Triumph Bonneville Speedmaster Overview

For 2018, Triumph offers the Bonneville Speedmaster as a custom / cruiser motorcycle with 1198 cc on tap. The 2018 Triumph Bonneville Speedmaster is built around a Four stoke, parallel twin, 270o crank, SOHC engine, a compression ratio of 10.0:1. Out on the road, the Bonneville Speedmaster delivers 57.4 kW @ 6550 rpm of peak power and 106 Nm @ 3100 rpm of torque. In everyday use, the 2018 Bonneville Speedmaster tips the scales at 245.5kg, carries a 12-litre fuel tank and offers a seat height of 705 mm. That's roughly 55.1 kg lighter than the average custom / cruiser motorcycle in our database. Every technical detail, from suspension travel to tyre sizes, is covered in the full 2018 Triumph Bonneville Speedmaster spec sheet below.

2018 Bonneville Speedmaster - Pros & Cons

Strengths

Strong power output: Peak output on the Bonneville Speedmaster is 57.4 kW @ 6550 rpm and 106 Nm @ 3100 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 705 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 Speedmaster 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

2 x 310 mm Disc, 2 piston calipers, ABS 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 41 mm Kayaba fork up front and Kayaba twin shocks with adjustable preload 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 Speedmaster means routine lubing and tension checks are part of ownership - skip them and sprocket wear accelerates noticeably.

Frame & chassis check

The Dual tubular steel cradle 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 Speedmaster's 245.5kg 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 Speedmaster - Buying & Maintenance Guide

What to check before buying

A pre-purchase check on the 2018 Triumph Bonneville Speedmaster 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 Speedmaster settles to a smooth idle within seconds.

Oil and filter changes

Oil changes are the cheapest insurance you can buy for a Bonneville Speedmaster'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 Speedmaster's hold up well with basic care - decent fuel, an occasional cleaner additive, and draining old fuel before any layup longer than three months.

2018 Triumph Bonneville Speedmaster - Frequently Asked Questions

What engine does the 2018 Triumph Bonneville Speedmaster have?

The 2018 Triumph Bonneville Speedmaster uses a Four stoke, parallel twin, 270o crank, SOHC engine with 1198 cc of displacement. It is liquid cooled.

How much does the 2018 Triumph Bonneville Speedmaster weigh?

The 2018 Triumph Bonneville Speedmaster weighs 245.5kg. This is the manufacturer's dry figure.

How much power does the 2018 Triumph Bonneville Speedmaster make?

The 2018 Triumph Bonneville Speedmaster produces 57.4 kW @ 6550 rpm of power and 106 Nm @ 3100 rpm of torque. These are peak figures.

What is the fuel tank capacity of the 2018 Triumph Bonneville Speedmaster?

The 2018 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 2018 Triumph Bonneville Speedmaster suitable for shorter riders?

The 2018 Triumph Bonneville Speedmaster has a seat height of 705 mm. This is a comfortable, accessible height for most riders.

What brakes does the 2018 Triumph Bonneville Speedmaster have?

The 2018 Triumph Bonneville Speedmaster uses 2 x 310 mm Disc, 2 piston calipers, ABS at the front and Single 255 mm disc, 2 piston caliper, ABS at the rear.

What tyre sizes does the 2018 Triumph Bonneville Speedmaster use?

The 2018 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 2018 Triumph Bonneville Speedmaster have?

The 2018 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, 270o crank, SOHC

Power

57.4 kW / 77 hp @ 6550 rpm

Torque

106 Nm / 10.7 kgf-m / 77.4 lb-ft @ 3100 rpm

Top Speed

Not published by manufacturer

Weight

245.5kg / 540 lbs

Fuel Capacity

12 Litres / 3.17 US gal

Full 2018 Triumph Bonneville Speedmaster Specifications

Year 2018

Make Model Triumph Bonneville Speedmaster

Seat Height 705 mm / 27.7 in

Dry Weight 245.5kg / 540 lbs

Fuel Capacity 12 Litres / 3.17 US gal

Max Power 57.4 kW / 77 hp @ 6550 rpm

Max Torque 106 Nm / 10.7 kgf-m / 77.4 lb-ft @ 3100 rpm

Displacement 1198 cc / 73.1 cu in

Engine Detail Four stoke, parallel twin, 270o crank, SOHC

Bore x Stroke 97.6 x 80 mm

Compression Ratio 10.0:1

Cooling System Liquid cooled

Exhaust Straight line stainless steel twin-skin slash cut twin stubby silencers

Fuel Induction Multipoint sequential electronic fuel injection

Ignition Digital

Lubrication Wet sump

Clutch Wet, multi-plate

Final Drive Chain, X-ring

Transmission / Drive 6-Speed

Frame Type Dual tubular steel cradle

Suspension - Front 41 mm Kayaba fork

Suspension - Rear Kayaba twin shocks with adjustable preload

Wheel Travel - Front 90 mm / 3.5 in

Wheel Travel - Rear 73 mm / 2.8 in

Brakes - Front 2 x 310 mm Disc, 2 piston calipers, ABS

Brakes - Rear Single 255 mm disc, 2 piston caliper, ABS

Tyres - Front 130/90-16

Tyres - Rear 150/80-16

Wheels Wire 32-spoke, steel rims

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