TRIUMPH STREET TRIPLE 660 S (2020 - on) Review


  • Peppy 660cc in-line triple engine
  • Can be restricted for A2 licence
  • Softer suspension handles UK roads well

At a glance

Owners' reliability rating: 5 out of 5 (5/5)
Power: 94 bhp
Seat height: Medium (31.9 in / 810 mm)
Weight: Low (370 lbs / 168 kg)


New £8,100
Used £6,400

Overall rating

Next up: Ride & brakes
4 out of 5 (4/5)

The Triumph Street Triple S isn't the poshest bike Hinckley builds. Most folk love a splash of bling and so it’s easy to understand why buyers – and shallow journalists – get in a froth over the range-topping Street Triple RS. Colour dash, umpteen-level electronics, Öhlins this, Brembo that, adjustable the other… Thing is, for most of us the S model is probably better.

On typical poorly maintained British roads the ride of the Street Triple S is more comfortable and less jittery than its overly firm stablemate. Its simplistic chassis recaptures some of the fun and not-taking-it-too-seriously air of the original Street Triple from 2007.

So does the engine: from 2020 the S model has a 660cc inline three, as opposed to the 765cc unit found in the R and RS versions and it serves up lashings of accessible, usable thrust with an edgy, compelling soundtrack. And at £8100 on the road, the S is also £2400 cheaper than its headline-grabbing sibling.

The S has a larger target audience, too. You can buy a full-fat Street Triple S from a dealer, but unlike the 765cc bikes the 660 motor can also be restricted for those on an A2 licence.

You can buy the Street Triple S and ride it on an A2 at 19 years old, have significantly more performance than with small-capacity entry bike such as a Honda CB500F or KTM 390 Duke, then get the triple derestricted once you’re fully qualified.

Yes, it’s the ‘learner’ bike. But don’t buy an R or RS without also trying the road-focused S.

Triumph Street Triple 660 A2 restricted

A2 restricted Triumph Street Triple S

The Triumph Street Triple S we tested here put out an unrestricted 94bhp but those on an A2 licence would need to have their bike restricted by a Triumph dealer. So what’s a Street Triple with 46.9bhp like to ride in the real world? We took one around the MCN250 test route to find out.

Despite being restricted, the Street Triple is still plenty of fun and rolling along with commuter traffic on A-roads you might not even notice the lack of power. Triple engines are perfectly suited to the job as they produce more of their torque lower in the rev range.

Whereas a restricted four-cylinder engine will run out of breath just as you would expect it to take off, the Triumph’s triple finds poke lower down and you can make more progress by short shifting your way through the gears.

On flowing B-roads the quality of the Triumph’s components mean that it outshines A2 competition from the likes of the Royal Enfield Interceptor 650 or restricted Honda CB650R.

Triumph Street Triple S on the road

Ride quality & brakes

Next up: Engine
4 out of 5 (4/5)

Separate high and low-speed damping adjustment? Ha. The S has the sort of spec that it’s easy to lazily describe as ‘budget’. The forks are unadjustable, the front brakes use two-pot sliding calipers, and the rear shock only has provision for tweaking the preload.

And that’s all fine. Sure, the Nissin brakes don’t have the initial bite of posh radials and it’d be stretching things to describe the damping action of the suspension as luxurious.

However, the friendly nature of the brakes makes them usable in tricky conditions and won’t unnerve less experienced riders, while there’s more than ample stopping power with a good squeeze. Stoppies? No bother. It’s just a bit of a shame the basic ABS jumps in when braking hard over bumps.

Chassis geometry isn’t quite as racy as the sportier versions, but again you don’t notice. Or care – the S is as light, agile and responsive as a Street Triple should be.

Better still, in 90% of road situations its straightforward forks and shock give a more absorbent, comfortable and composed ride than the stiff, fidgety, bone-jarring RS.

Triumph Street Triple S front brake


Next up: Reliability
4 out of 5 (4/5)

Triumph inflated the Street Triple’s engine from 675 to 765cc in 2017. Based on a bored-and-stroked Daytona motor, they cooked up three different flavours to suit a trio of models: a track-ready RS (121bhp and 57 lb.ft), sporty R (116bhp, 57 lb.ft), and everyday S (111bhp, 54 lb.ft). Smashing.

Or almost smashing. As a likely first Triumph they wanted a 47bhp A2-legal version of the revamped model, but A2 bikes can’t be based on machines making more than 94bhp.

So they used a 660cc engine (previously developed to suit Australian licence rules) specifically for an A2 Street Triple S. Having a unique motor for a handful of learner sales was clearly a lot of faff though, so for 2020’s model re-fresh all versions of the S are now 660cc.

In restricted A2 guise it’s surprisingly potent. Though it has less torque (44 lb.ft compared to 54 for last year’s 765cc S) it’s at an accessible 5250rpm. So, while it gets breathless in the top third of the rev range, at realistic road revs the 660 is flexible and lively. A colleague rode it not knowing it was restricted… and didn’t notice.

Get your licence sorted and a dealer can swiftly derestrict the Street Triple S – or if you’ve got a full licence, they can sell it you in full-power form. With 49 lb.ft at 9250rpm and 94bhp at 11,250rpm, output is below last year’s larger S but without a back-to-back ride you’d never know.

It’s all reassuringly Street Triple, with a deep burbling exhaust note and willing, urgent, elastic drive right through the revs. Wheelying under acceleration and capable of 87mph in second gear, the 660 is anything but lacking.

Triumph Street Triple S engine

Reliability & build quality

Next up: Value
5 out of 5 (5/5)

Triumph’s build quality and level of finish is much better than it was 15 years ago. There are no longer ugly hex-head bolts attaching parts to the frame, inconsistent fastener sizes or scrappy bits of plastic.

Early 765cc Street Triples were recalled for incorrectly sealed switchgear that let water in and caused issues, however it will have been sorted by now and shouldn’t affect the S. There have also been a few 765s with slight oil leaks, but the 660 motor is less stressed and should be utterly dependable.

Value vs rivals

Next up: Equipment
4 out of 5 (4/5)

The Street Triple S is group 13 insurance; this is the same as the sportier R model, but two groups lower than the RS. For comparison, a Yamaha MT-07 (£6697) and Kawasaki Z900 (£8899) are both only group 11.

Typical average economy is 45mpg. With the 17.4-litre tank that’s over 170 miles of range.

Triumph Street Triple S turning left

At £8100 the Street Triple S is reasonably priced; it’s not got as much tech, power, handling or speed as the similarly priced KTM 790 Duke (£8499), however the Triumph is less likely to have reliability niggles and will have stronger residual value.


3 out of 5 (3/5)

This isn’t the bike for tech nerds. The S retains the previous-generation display (no TFT or colour here), has simple rider aids and basic switchgear.

As with the chassis, none of this really matters. Though the ‘switchcubes’ don’t have Triumph’s now trademark joystick and don’t glow in the dark, the layout is easy to use.

And the switches control a dash that’s thankfully free of the befuddling display options and hard-to-read numbers that blight the R and RS versions.

Triumph Street Triple S dash

There are only two riding modes – Road and Rain – but it’s not a problem given the usability of the engine and the fact there’s usually little difference between modes on any Triumph.

The traction control and ABS can be felt intervening if you’re riding with real vim and vigour, but they don’t get in the way as such; if anything, it’s nice to have a little tap on the shoulder to say ‘that’s quite enough gusto for a public road’.


Engine size 660cc
Engine type Liquid cooled, DOHC, 12v, inline three
Frame type Aluminium twin spar
Fuel capacity 17.4 litres
Seat height 810mm
Bike weight 168kg
Front suspension 43mm forks, no adjustment
Rear suspension monoshock, preload adjustable
Front brake 2 x 310mm discs with two-piston calipers. ABS
Rear brake 220mm disc with one-piston caliper. ABS
Front tyre size 120/70 ZR17
Rear tyre size 18055 ZR17

Mpg, costs & insurance

Average fuel consumption 45 mpg
Annual road tax £117
Annual service cost -
New price £8,100
Used price £6,400
Insurance group -
How much to insure?
Warranty term Two years

Top speed & performance

Max power 94 bhp
Max torque 49 ft-lb
Top speed 140 mph
1/4 mile acceleration -
Tank range 172 miles

Model history & versions

Model history

  • 2007: Triumph peel the fairing off the Daytona sports bike, swap its clip-on ’bars and rearset footpegs for sensibly-located parts, and create a sales success. Light, simple, agile, perky, the 675cc Street Triple is fuss-free and all about enjoyment, regardless of experience. Ace racket from its twin underseat pipes, too.
  • 2008: Street Triple R launched, with a bit more power, nose-down stance, fully adjustable suspension, radial brakes.
  • 2012: facelift time, with new angular ‘Dame Edna’ headlights (like used on the updated Speed Triple) to replace the round ‘Harry Potter’ lamps.
  • 2013: Big changes. Weight down by six kilos, new cast subframe, sportier weight distribution, exhaust tucked underneath, and a taller first gear (nicked from the Daytona). Racier, faster, ultimately better handling, though perhaps not as playful or fun as the original. R version gets stronger brakes, even shaper geometry and an up-at-the-tail stance.
  • 2015: New RX model introduced. Basically it’s an R with a quickshifter and Daytona seat unit.
  • 2017: All change. There’s a new frame, curvy swingarm, electronics and 765cc engine, and three versions: a street-ready S (also available in 660cc A2-licence form); a more powerful and sporty R with TFT dash; and the trackday-winning RS with even more power and fancy suspension and brakes.
  • 2020: Styling tweaks and crisper response for the R, and more grunt and a flash new dash for the range-topping RS. The S model gets the styling nudges, but more importantly is now 660cc whether you go for restricted A2 or full power form.

Other versions

Sporty R model has more powerful 765cc engine, adjustable suspension, TFT dash, more electronics, and costs £9100. The top-of-the-line RS features even greater output, bells-and-whistles electronics, the latest dash, Öhlins rear shock, and costs £10,500.

Owners' reviews for the TRIUMPH STREET TRIPLE 660 S (2020 - on)

2 owners have reviewed their TRIUMPH STREET TRIPLE 660 S (2020 - on) and rated it in a number of areas. Read what they have to say and what they like and dislike about the bike below.

Review your TRIUMPH STREET TRIPLE 660 S (2020 - on)

Summary of owners' reviews

Overall rating: 4.5 out of 5 (4.5/5)
Ride quality & brakes: 5 out of 5 (5/5)
Engine: 5 out of 5 (5/5)
Reliability & build quality: 5 out of 5 (5/5)
Value vs rivals: 4.5 out of 5 (4.5/5)
Equipment: 4 out of 5 (4/5)
5 out of 5 Excellent 3rd bike, what more could I need?
25 September 2021 by LuckyGoHappy

Year: 2021

This is a premium feeling, very nimble and rapid bike. I had it A2 de-restricted prior to delivery (distance purchase) and I’m extremely happy with the bike.I have borrowed a triumph trident during the service and I definitely made the correct choice in buying the triple S. the ride feels better and the bike is quicker and sharper to my mind.

Ride quality & brakes 5 out of 5

I have previously ridden CB125R and CB500F before moving to this. The ride quality is just a little firmer, but not jarring, very pleasant even on the low quality roads I’ve been on so far.The bike has no problems at low speed traffic, but does seem to be asking why we are not powering away! It really feels like it has more to give at all times.

Engine 5 out of 5

As I alluded to above, the engine seems to have more to give at all speed and in all gears. Overtakes at any speed are a breeze.The exhaust as stock sounds good, sounds like it’s waiting to take off if you pootle, the sounds are quite addictive once it gets past 30 on the open road.

Reliability & build quality 5 out of 5

It is brand new so not expected niggles yet. The quality feels premium. Gear changes smooth, brakes effective.

Value vs rivals 5 out of 5

My first service was not free due to buying long distance for a good discount.Only 600 miles travelled since august, but fuel costs don’t stand out as expensive.

Equipment 4 out of 5

ABS has proven itself when a car cut my side of the road on a country bend.I didn’t buy any accessories. Even the standard indicators are nice and bright.The headlights are good and then full beam is very powerful when used.Brakes are good front and back.

Buying experience: Pre reg deal. 1 Mile on the clock. Saved £500. Making it good value compared with the triumph trident.

4 out of 5 Higly recommend it for riders with no much experience
27 December 2020 by Ovi

Version: De-restrected

Year: 2020

For me this is my second motorbike and a huge step from a Honda CBR125R to Triumph Street Triple S at 49 yo. I’ve bought this motorcycle brand new from dealer and for about a month it was restricted until the de-restricted kit it was available/fitted As a rider with no more than 2 years experience and 4000 miles on the roads, I was very happy when it was restricted but once become de-restricted I can’t tell you how happy I was (even a bit scared for the first few miles). I use the bike almost everyday day for work, commuting daily approx 40miles/day and on motorways (max 85miles/hour and is a bit windy). This motorbike is all what i want for someone with my experience, is very reliable through London traffic, I will say economical (about 160mile/full tank, but I believe is depends how we ride as individual) and so far so very good. This is a addictive motorcycle for everyday use. I can’t wait to be back in road again with my beauty... Few extras I did fit on bike: smoke windshield, sidebars mirrors, tail tidy, scrolling led indicators and obviously the de-restricted kit). I’m very happy with my bike, looks very good and I hope I will not have any problems for the next two years. After this one, if Triumph is not coming with some updates on these Street triple models, I will move for sure to a BMW S1000R 2021 model. I will recommend this bike to everyone with my experience and not only!

Ride quality & brakes 5 out of 5

I can road the bike for sure approx 2 hours till I’ll need a break

Engine 5 out of 5

Can’t say to much, is working very well (1200 miles on clock)

Reliability & build quality 5 out of 5

No problems so far

Value vs rivals 4 out of 5

1st service and road tax it was free from dealer but the 2nd service at 6000miles will be around £250. Full tank is about 160miles probably 170miles combined city and mortorways.

Equipment 4 out of 5

I don’t like the dashboard but I do like the sound and head lights

Buying experience: Bought from dealer and I head probably about £300 discount

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