presentation of the GSX-S125 2025
Since its creation, the GSX-S125's only evolution has been the parsimonious renewal of its colors and its Euro 5 pass in 2022. This is a commitment for which it has had to make a few concessions. Maximum power is only available at 10,500 rpm, i.e. 500 rpm more than before. The same applies to torque. You'll recognize the GSX-S E5 by its new engine cover. As for the two kilos gained in the update, they should be invisible on the road. But what does the little GSX-S think when it sees its big brothers, the 950 and 1000?
When it comes to adrenalin, mean roadsters have taken over. With chassis and engines borrowed from the most radical sports bikes, these machines don't pull any punches. There's a plethora of medium and large-displacement models on offer. In 125cc, on the other hand, such bikes are few and far between. Is this due to their modest power? But for some time now, things have been moving.
With its MT-125, Yamaha has offered something far more exciting than its YBR. KTM provoked emotions with its Duke 125. The Tuono 125 is back. Kawasaki made its debut with the Z 125. And Suzuki intends to make its presence felt in this segment. Especially as it has a strong name in stock: GSX-S. The 1000 recently tipped Suz' over into the dark side of big streetfighters, the 950 arrived to take a slice of the juicy medium-displacement market, and the 125 GSX-S now completes the 1/8th-litre offering.
To design this little knockout, the manufacturer started with the GSX-R 125. The frame, peripherals and powertrain are retained, and the bodywork is adapted. And that's where the first surprise comes in. With such a name, you'd expect a miniature GSX-S750. But not at all. The GSX-S 125 has its own identity, hooked in the hoof, angry in the shoulders and intriguing in the face. Opinions can be divided as to the face, bulging and chubby.
Suzuki has installed the mini-sport's 124.4 cm3 block in its square tubular steel chassis. Equipped with 32-mm fuel injection, double ACT, 4 valves and liquid cooling, this single-cylinder engine intends to deliver its 15 legal horsepower with first-rate acceleration performance. The bike's overall weight should help in this exercise. The GSX-S 125 weighs in at 135 kilos, 7 more than the slender 125 Duke and CBF 125, but 3 less than the MT-125.

2020 had made some slight adjustments, with a warning light on the right-hand commodo and a black display for the dashboard.
Suzuki is pursuing a segment not seen since the 125 GN. The GSX-S 125 is light years ahead of its predecessor. It will have to tackle competitors who are already well-established and self-assured. A rebel, it wants to rely on its mini-GSX-R innards to make a name and a position for itself. A good price tag should help.
Key facts Suzuki GSX-S125 (2025) : What you need to know before you buy
Prices
| Basic version | |
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£4,999
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4,490€
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4,799€
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4,499€
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7,190€
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4,995CH
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Performance
- Max speed : approximately 120 km/h (74.60 mph)
- Average fuel consumption : 2.40 liters/100km (0.98 mpg)
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Estimated range
: 458 km (285 miles)
Calculated range until tank is empty, not verified.
Specifications Suzuki GSX-S125 2025
- Chassis
- Two-seater saddle
- Frame : Square steel tube structure
- Fuel capacity : 11 liters (2.91 US gallons)
- Oil capacity : 1.50 liters (0.40 US gallons)
- Seat height : 785 mm (30.91 in)
- Length : 2,020 mm (79.53 in)
- Width : 745 mm (29.33 in)
- Min height : 1,040 mm (40.94 in)
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Min. ground clearance : 155 mm (6.10 in)
- Wheelbase : 1,300 mm (51.18 in)
- Weight when fully loaded : 135 kg (298 lb)
- Front axle
- Telehydraulic fork Ø nc
- Braking 1 disc Ø 290 mm (11.42 in), 2-piston caliper
- Front tire : 90 / 80 - 17 → Order this type of tire
- Pressure : 1.75 bar
- Transmission
- 6 stage gearbox , manual
- Secondary by chain
- Rear axle
- Mono-damper
- Braking 1 disc Ø 187 mm (7.36 in), single-piston caliper
- Rear tire : 130 / 70 - 17 → Order this type of tire
- Pressure : 2 bar
- Motor
- single-cylinder , 4 strokes
- Injection Ø 32 mm
- Cooling system : liquid
- 2 ACT
- 4 valves
- 124.40 cc (Bore x stroke: 62 x 41.2 mm)
- 15 ch (14.80 hp) to 10,500 rpm
- 1.20 mkg (11 Nm) to 8,500 rpm
- Power-to-weight ratio : approximately 8.42 kg/ch
- Weight / torque ratio : approximately 103.91 kg/mkg
- Compression : 11 : 1
- CO² emissions: 55 g/km
- Standard equipment
- Brake assist : ABS
- Aluminium rims
- Gear indicator
- Start assist
- Practical information

helmet
Gloves
jacket
braking
Chain kit
Oils
Parts
Luggage
Tires
Bikers' reviews Leave a review - 10 reviews
Slts Rating : 4/5 Respond to Chico
Easy to handle and less expensive than its competitors. Rating : 5/5 Respond to Artpak
I've owned the bike since October 2018.
Overall I'm very satisfied, it looks good, it's got pep even with the break-in underway (600km), it's sporty, maneuverable, and bikers make me the V and don't call me a mobylettist ahaha.
Suzuki has made a real engine (double ACT) that's flexible and very pleasant to drive, allowing you to rev it up (like all 125s, you'll tell me, but with flexibility and a very high shifter).
Of course, there are a few negative points:
- Front braking is effective but lacks real bite (a recurrent problem with the Suz), and I was going easy on the brake pads (too easy?), feeling like I was squeezing a sponge, but you get the hang of it.
- The shock absorbers are really hard, even hard-edged! Good for handling, but you can feel the slightest hole or speed bump.
- Hard seat: on a bike with a sporty seat, you can't complain too much, but the duo will be compromising on long trips, even if that's not what you want
Positives:
- Look (like it or not) really nice, just a little wider would have been more rewarding against a Mt125 or CB125R
- Engine character
- Gearbox flexibility
- Power delivery
- Handling
- Engine braking
- ABS
- Class-leading power-to-weight ratio
No topspeed yet, as I'm waiting for the break-in period to end, but I can feel that this little lady wants to get away with it! So I'm increasing it by 500rpm every 100km from the first 500km
In short, if it had an inverted fork and a more responsive front brake, it would have been 5/5!
But I'd recommend it to anyone who wants a 125 with a top quality/finish/performance/price ratio!
Of course, it's not as well-equipped as an MT or CB125R (especially the fork, which is classic), but the price and performance point me in the right direction, and in terms of performance it dethrones them!
V to all Rating : 4/5 Respond to GigiRider95
Well, it's a marvel: the bike has plenty of torque and acceleration, and even though I didn't test the top speed, the data I'm given is 100% reliable.
The bike's got plenty of pep and, given the engine's flexibility, you can pull it in without having to go over 10,000 to get a good feeling (it goes up to 13,000)!
Good tires, a 125 that looks like a motorcycle compared to a YS125/CB125F (more utilitarian and more accessible and intended for the home/work trip)
This bike has nothing to envy its competitors (MT-125, CB125R) which are better equipped (forks, look and more) but more expensive for the same or even worse performance, especially as the GSXS has a mono with double ACT, which is rare!
In short, I'm thinking of snapping it up as soon as possible, because it's a real winner! Rating : 4/5 Respond to Nono95
On what criteria do you base your judgement?
Because having tried it, it's a great bike!
Different from the cb125f, and from the YS I've just tried in the next section, of course the price isn't the same, but I don't have the same feeling as you.
A good video test would tell us more about this beautiful machine.
Thank you very much. Rating : 5/5 Participate in the conversation