The GPX125 is a brand new offering for 2022 from Sinnis, looking to take on the hugely popular Lexmoto LXR as a budget-friendly Chinese-built sportsbike.

The 125cc category is pretty stacked right now but Sinnis have made sure the GPX125 stands out by giving it an aggressive riding style that delivers a more authentic supersport experience than many of its rivals.

Most 125cc sport bikes these days are becoming a bit more mellow, the trend is to raise the bars up a bit and have a slightly relaxed riding position so that they are more comfortable for everyday riding. Sinnis have gone for something a bit different and made their GPX125 a little bit more sport-focused and that could be a positive or a negative, depending on what you are looking for.

I recently had the chance to spend a few days in the saddle of the GPX and here is my full road test review!

Styling and Design | A budget bike with a premium look

Let's start with the obvious, despite the three-and-a-half grand price tag, this is a bike that looks like a serious bit of kit. It looks premium and slick and the big bike proportions ensure that at a glance, most people think they are looking at a much larger capacity motorcycle. I received plenty of waves and nods from admiring passers by on my travels and the large proportions give it a nice and refined feeling on the road as well.

The GPX comes in two colourways, Carbon Black or Ultimate Grey, so if you are a fan of bright colours you are out of luck. We received the Carbon Black edition and in my opinion, it looks absolutely delightful. We do get a splash of colour from the cyan details and the forks (the rear sets are finished in gold which is a nice touch too). All in all, I think this motorcycle looks excellent but you can judge that for yourself.

Sinnis GPX 125 Review

Engine and Performance

The GPX125 is powered by a 125cc liquid-cooled, DOHC, 4-valve engine that is fully Euro 5 compliant. The engine puts out 12.7hp which is only a couple of horses short of the maximum allowed for CBT licence holders. 

Where the GPX is at its best is in the upper ranges, with an excellent top speed, it is able to maintain 74mph on the dual carriageway quite easily. Going from 30 to 60 is still fairly rapid for a 125cc and if you are going downhill, the extra weight might actually be an advantage.

Sinnis GPX 125 Top Speed

According to Sinnis, the GPX can reach top speeds of 70mph.

Sinnis GPX 125 engine

Brakes and Suspension

For the brakes, we have a 276mm single wavy disc on the front with a 220mm single wavy disc on the rear. Sinnis have opted to go with a combined braking system rather than ABS on this model and that means when you apply the rear brake it automatically applies a bit of the front, with the front functioning individually as normal. Overall the brakes feel pretty good, they respond swiftly and can slow you down in a hurry when needed.

When it comes to suspension, we have 48mm upside-down telescopic forks on the front and a basic mono-shock on the rear. It is a budget model so there is no adjustability or anything but the setup again feels pretty good. It is relatively firm which is just what you want from this style of bike, it feels nice and planted and corners like a dream, while also having enough give in it to absorb some of the lumps and bumps of Norfolk roads without much issue. The brakes and suspension get the job done pretty well and help the bike feel more responsive than you might expect from a budget model.

Sinnis GPX 125 brakes and suspension

Technology, Dash and Switchgear

When it comes to tech features, the Sinnis is kept pretty basic. We have a clear LCD dash with a nice big speedo, gear indicator, and a handy rpm meter along the top. And that is about it. This is a budget model so it is what you would expect, with no real fancy features added on.

One pleasant surprise was the switchgear, it is all placed very intuitively and feels quite well-made and substantial. This is often an area some of the more premium models may skimp on, so it was nice to see some attention here, even if there isn't much to operate on this bike.

Sinnis GPX 125 LCD Dash

Fuel Tank and MPG

When it comes to fuel economy, Sinnis claim this 12L tank will do 248 miles and when ridden conservatively, they may be right. This is a sport bike however and most people are going to be giving it a bit of a thrashing, so more realistically, you can expect around 200 miles, which is still excellent and again helps add to the overall value here.

Sinnis have done a particularly good job here with the tank. It feels nice and substantial and has been padded out with little plastic parts on the sides. You can almost lay over the tank and grip it comfortably with legs or even elbows in a full tuck. As far as this style of bike goes, it feels very good and the wind protection is also outstanding. While in a full tuck position, you feel almost no wind resistance, even at 70mph speeds on the dual carriageway.

Seat Height and Riding Position

The seat height is 816mm, so at around 5' 10 I can just about flat-foot it. That does mean the GPX could be a good option for taller riders as well, while shorter folk may struggle a bit.

In terms of the riding position, it is a little bit aggressive with the seat up high and the bars down low, it feels much more like a traditional supersport than many of its peers and it also rides like one. This is a motorcycle that likes to chase redlines and encourages you to watch your RPMs and learn how to get the best out of it. That can be a ton of fun and the more time I spent with it, the more I enjoyed it.

If you are looking for something with a relaxing ride then this may not be for you but if you like the idea of an authentic supersport experience, this could serve as an excellent introduction to that style of motorcycle.


The Sinnis GPX125 weighs in at 158 kilos, which is a bit on the heavy side for the 125 category.

However, despite being on the heavier side, one of the GPX's biggest strengths is its agility and response in its handling. Cornering is basically effortless and the motorcycle can flick from side to side with only light touches required.

To put it into perspective, the Sinnis SMR 125 we had in at the same time (see Felix's review of the Sinnis SM-R 125), was almost 20 kilos lighter and with the full 15bhp.

If you want a more 'like for like' comparison, Yamaha's big-selling but admittedly much more premium R125 weighs in at 140 kilos and again boasts the full 15bhp allowance in its engine.

Sinnis GPX 125 Price

The other key strength is of course, the value for money this budget motorcycle represents. At the time of writing, the Sinnis GPX125 starts at £3,499 brand new and comes with a two year warranty for those who may still be concerned about the reliability of a Chinese built machine.

When we compare the GPX with some of its more premium rivals, we are talking about a grand and a half difference in price here. There is no getting around the fact that the low end acceleration can't quite keep up with those premium models, the power to weight ratio simply isn't there. However, the top speed and agility are both excellent and this motorcycle can give you just as much fun.

Final Thoughts on the Sinnis GPX 125

Over all, I think the Sinnis GPX125 fits very well into the market. It isn't going to be for everyone, it is sporty, with a bit more of an involved riding style. However, if you like the idea of getting into supersport riding, this could be a perfect start.

It is a bike that likes to chase redlines and does it without breaking the speed limits. There are no scary power bands, it is easy to handle and easy to manage. The low end acceleration will struggle to keep up with some of the more premium rivals but the top speed is great and the bike is unquestionably a ton of fun to ride.

With a very accessible price point, you could ride one of these with your full warranty, then move on to something bigger on the other side with a bit more change in your pocket! It is definitely, something worth thinking about...


  • £3,499 starting price is great value for money
  • Excellent cornering and agility
  • Great 70mph+ top speeds
  • Authentic supersport style


  • Low-end acceleration may struggle to keep up with premium models
  • A more focused sport riding position won't be for everyone
Sinnis GPX 125 whole bike

The Last Stop!

I hope you enjoyed my full road test review on the new Sinnis GPX!

If you do have your very own Sinnis GPX, or perhaps another motorcycle you need to insure, make sure to get a motorcycle insurance quote direct with Lexham!

Sinnis GPX 125 Specification (2022-onwards)

Engine 124cc, Liquid-cooled, DOHC 4V
Fuel tank 12L
Brakes Front: Hydraulic Disc
Rear: Hydraulic Disc
Suspension Front: USD Forks
Rear: Single Shock
Seat height 816mm
Weight 158kg
Price £3,499

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