2021 Triumph Street Triple RS Specifications

Name: 2021 Triumph Street Triple RS
Brand: Triumph

Sport • Specs last verified 13 July 2026

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2021 Triumph Street Triple RS Overview

Triumph Street Triple RS is a sport motorcycle, displacing 765 cc. Power comes from a Four stroke, in-line 3-cylinder, DOHC, 4 valve per cylinder engine, a compression ratio of 12.54:1. On the performance side, it delivers 121.3 hp @ 11,750 rpm of peak power and 79 Nm @ 9,350 rpm of torque. On the road, the 2021 Street Triple RS tips the scales at 166 kg, carries a 17.4-litre fuel tank, offers a seat height of 825 mm and spans a 1405 mm wheelbase. That's roughly 36.7 kg lighter than the average sport motorcycle in our database. The full 2021 Triumph Street Triple RS spec sheet below covers every technical detail, from suspension travel to tyre sizes.

2021 Street Triple RS - Pros & Cons

Strengths

Strong power output: With 121.3 hp @ 11,750 rpm and 79 Nm @ 9,350 rpm of torque on tap, the Street Triple RS 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.

Considerations

Tall seat height: At 825 mm, shorter riders will likely be on tiptoes at a standstill - worth sitting on one before you buy.
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

Street Triple RS'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 with SAI on the Street Triple RS 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 floating discs, Brembo M50 4-piston monobloc calipers - solid stopping power, with disc and pad wear best checked on the same schedule as tyre changes.

Suspension condition on used examples

The Street Triple RS's suspension runs Showa 41 mm upside down big piston forks at the front. The rear uses Öhlins STX40 fully-adjustable piggyback reservoir RSU. Fork-seal condition and rear linkage play are the two things worth checking before buying used.

Final drive maintenance

The Street Triple RS 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 Front - Aluminum beam twin spar Rear - 2 piece high pressure die cast, the Street Triple RS's chassis is straightforward to inspect: look for corrosion, cracks or repair welds around stress points like the head-stock and swingarm mounts.

Street Triple RS - Buying & Maintenance Guide

What to check before buying

Before handing over money for a used 2021 Triumph Street Triple RS, 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 Street Triple RS should catch quickly and settle into a smooth idle.

Oil and filter changes

Nothing protects a Street Triple RS'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 Street Triple RS 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 Street Triple RS - Frequently Asked Questions

What engine does the 2021 Triumph Street Triple RS have?

The 2021 Triumph Street Triple RS uses a Four stroke, in-line 3-cylinder, DOHC, 4 valve per cylinder engine with 765 cc of displacement. It is liquid-cooled.

How much does the 2021 Triumph Street Triple RS weigh?

The 2021 Triumph Street Triple RS weighs 166 kg. This is the manufacturer's dry figure.

How much power does the 2021 Triumph Street Triple RS make?

The 2021 Triumph Street Triple RS produces 121.3 hp @ 11,750 rpm of power and 79 Nm @ 9,350 rpm of torque. These are peak figures.

What is the fuel tank capacity of the 2021 Triumph Street Triple RS?

The 2021 Triumph Street Triple RS has a 17.4-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 290-347 km between stops.

Is the 2021 Triumph Street Triple RS suitable for shorter riders?

The 2021 Triumph Street Triple RS has a seat height of 825 mm. This is towards the tall end of the spectrum and will require most riders under 175 cm to tiptoe at stops.

What brakes does the 2021 Triumph Street Triple RS have?

The 2021 Triumph Street Triple RS uses 2 x 310mm floating discs, Brembo M50 4-piston monobloc calipers at the front and Single 220mm disc, Brembo single-piston caliper at the rear.

What tyre sizes does the 2021 Triumph Street Triple RS use?

The 2021 Triumph Street Triple RS runs 120/70 ZR17 Pirelli Diablo Supercorsa SP V3 front and 180/55 ZR17 Pirelli Diablo Supercorsa SP V3 rear tyres. A good selection of sport, touring and all-weather rubber is available in these sizes.

What gearbox does the 2021 Triumph Street Triple RS have?

The 2021 Triumph Street Triple RS is fitted with a 6 Speed with Triumph Shift Assist transmission.

Triumph Street Triple RS Spec Evolution

The Triumph Street Triple RS was produced across 4 model years (2020-2023). 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	2021	2022	2023
Max Power	121.3 hp / 123 PS / 90 kW @ 11,750 rpm	121.3 hp / 123 PS / 90 kW @ 11,750 rpm	121.3 hp / 90 kW @ 11750 rpm	128.2 hp / 95.6 kW @ 12000 rpm
Dry Weight	166 kg / 366 lbs	166 kg / 366 lbs	168 kg / 370.3 lbs	-
Engine Detail	Four stroke, in-line 3-cylinder, DOHC, 4 valve per cylinder	Four stroke, in-line 3-cylinder, DOHC, 4 valve per cylinder	Four stroke, in-line 3-cylinder, DOHC, 4 valve per cylinder	Four stroke, In-line 3-cylinder, DOHC, 4 valve per cylinder
Seat Height	825 mm / 32.5 in	825 mm / 32.5 in	825 mm / 32.5 in	836 mm / 32.9 in
Fuel Capacity	17.4 Litres / 4.6 US gal / 3.8 Imp gal	17.4 Litres / 4.6 US gal / 3.8 Imp gal	17.4 Litres / 4.6 US gal	15 Litres / 309 US gal
Frame Type	Front - Aluminum beam twin spar Rear - 2 piece high pressure die cast	Front - Aluminum beam twin spar Rear - 2 piece high pressure die cast	Front - Aluminum beam twin spar Rear - 2 piece high pressure die cast	Aluminium beam twin spar frame with 2 piece high pressure die cast rear subframe
Wheelbase	1405 mm / 55.3 in	1405 mm / 55.3 in	1405 mm / 55.3 in	1399 mm / 55.0 in
Brakes - Front	2 x 310mm floating discs, Brembo M50 4-piston monobloc calipers	2 x 310mm floating discs, Brembo M50 4-piston monobloc calipers	2 x 310mm floating discs, Brembo M50 4-piston radial monoblock calipers	2 x 310 mm floating discs, Brembo Stylema 4-piston radial monobloc calipers, OC-ABS, Brembo MCS radial master cylinder

Key Specifications

Engine

Four stroke, in-line 3-cylinder, DOHC, 4 valve per cylinder

Power

121.3 hp / 123 PS / 90 kW @ 11,750 rpm

Torque

79 Nm / 58.3 lb-ft @ 9,350 rpm

Top Speed

Not published by manufacturer

Weight

166 kg / 366 lbs

Fuel Capacity

17.4 Litres / 4.6 US gal / 3.8 Imp gal

Full 2021 Triumph Street Triple RS Specifications

Year 2021

Make Model Triumph Street Triple RS

Seat Height 825 mm / 32.5 in

Wheelbase 1405 mm / 55.3 in

Height 1085 mm / 42.7 in - without mirrors

Length 1085 mm / 42.7 in - without mirrors

Width 775 mm / 30.5 in - with handlebars

Dry Weight 166 kg / 366 lbs

Fuel Capacity 17.4 Litres / 4.6 US gal / 3.8 Imp gal

Max Power 121.3 hp / 123 PS / 90 kW @ 11,750 rpm

Max Torque 79 Nm / 58.3 lb-ft @ 9,350 rpm

Displacement 765 cc / 46.6 cu-in

Engine Detail Four stroke, in-line 3-cylinder, DOHC, 4 valve per cylinder

Bore x Stroke 78 x 53.4 mm

Compression Ratio 12.54:1

Cooling System Liquid-cooled

Emissions Euro 5

Exhaust Stainless steel 3 into 1 exhaust system low single sided stainless steel silencer

Fuel Induction Multipoint sequential electronic fuel injection with SAI. Electronic throttle control

Ignition Digital - inductive type

Lubrication Wet sump

Starter Electric

Clutch Wet, multi-plate, slip-assisted

Final Drive X ring chain

Transmission / Drive 6 Speed with Triumph Shift Assist

Frame Type Front - Aluminum beam twin spar Rear - 2 piece high pressure die cast

Suspension - Front Showa 41 mm upside down big piston forks (BPF), Adjustable compression damping, rebound damping and preload adjustment

Suspension - Rear Öhlins STX40 fully-adjustable piggyback reservoir RSU

Rake 23.9°

Swingarm Twin-sided, cast aluminum alloy

Trail 100 mm / 3.9 in

Wheel Travel - Front 115 mm / 4.5 in

Wheel Travel - Rear 131 mm / 5.2 in

Brakes - Front 2 x 310mm floating discs, Brembo M50 4-piston monobloc calipers

Brakes - Rear Single 220mm disc, Brembo single-piston caliper

ABS Adjustable ABS

Tyres - Front 120/70 ZR17 Pirelli Diablo Supercorsa SP V3

Tyres - Rear 180/55 ZR17 Pirelli Diablo Supercorsa SP V3

Wheels 5-spoke cast aluminum alloy

Wheels - Front 3.5 x 17

Wheels - Rear 5.5 x 17

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