By Paul Kendrick, Cardio & Endurance Editor · Updated 8 July 2026
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The JOROTO X4S is a mid-range indoor cycling bike that aims to bridge the gap between cheap friction spin bikes and expensive connected smart bikes. It uses magnetic resistance with a readable, numbered dial, a dual flywheel for a weighted ride feel, a quiet belt drive and Bluetooth app support, all for a price that sits well below the big connected brands. It is aimed at people who want a serious, quiet, repeatable indoor ride at home without paying four figures. The headline verdict is that the X4S delivers most of what makes an expensive bike enjoyable, and the main things it leaves out (auto-adjusting resistance and a big built-in screen) are the things you can most easily live without.
Regular indoor cycling is a genuinely effective way to build fitness. It raises your heart rate, is easy on the joints and counts towards the physical activity the NHS recommends for a healthier heart and body (NHS physical activity guidelines). A bike you actually enjoy using is the one that gets ridden, and the X4S has enough quality-of-life features to keep you coming back.
How we review
This review is based on extensive research of verified owner reviews, hands-on impressions from trusted expert outlets and JOROTO's published specifications. We have not run our own months-long endurance test of this exact unit, so we have been careful to report only consistent, repeated findings (both the praise and the complaints) rather than one-off opinions.
The X4S makes most sense for someone who wants a proper indoor training bike at home and cares about a smooth, quiet, repeatable ride, but does not want to spend four figures on a fully connected smart bike. Home cyclists doing structured intervals, people following app-based classes, and anyone in a flat or shared house who needs quiet kit will all get a lot from it. If you specifically want the resistance to change automatically as an app tells it to, or you want a large screen built into the bike, this is not that machine, and our best smart exercise bike guide covers those pricier options.
This is where the X4S earns its reputation. The frame is heavy and wide, with broad stabilisers, so it feels planted rather than skittish when you climb out of the saddle and push hard. The dual flywheel setup delivers a smooth, momentum-rich pedal stroke that feels closer to a road bike than the light, buzzy feel of budget machines. Handlebars and saddle are both adjustable for reach and height, so most riders can find a comfortable, efficient position.
The standout is the resistance system. Rather than a vague friction knob, the X4S uses magnetic resistance with a numbered, readable dial, so you can dial in an exact level and reproduce it session to session. For anyone following a structured plan or repeating benchmark efforts, that repeatability is genuinely useful and is normally reserved for pricier bikes.
| Resistance type | Magnetic, readable numbered dial |
|---|---|
| Flywheel | Dual flywheel weighted system |
| Drive | Belt drive (quiet, low maintenance) |
| Connectivity | Bluetooth, app support incl. Kinomap |
| Console | Backlit LCD: time, distance, speed, RPM, calories, resistance |
| Max user weight | Approx 150 kg / 330 lb |
| Adjustability | Handlebars and saddle adjustable for height and reach |
| Typical price | Around £440 (check current price) |
In use, the X4S rides better than its price suggests. The weighted dual flywheel keeps the pedal stroke smooth through the dead spots, and the magnetic resistance ramps up cleanly without the grabbiness or squeal of a worn felt pad. Because there is no friction brake or chain, it runs quietly, which is the feature owners praise most: you can ride early in the morning or late at night without waking the house, and hold a conversation or watch television over it.
The readable resistance dial makes interval work easy. You can set level, say, 20 for a work interval and drop back to 8 for recovery, and know you will get exactly the same load next time. That structure is what turns aimless pedalling into training that actually improves your fitness, and steady cardiovascular exercise like this brings well-documented benefits for your heart and overall health (NHS on the benefits of exercise).
The X4S connects over Bluetooth and works with third-party training apps, including platforms such as Kinomap where the on-screen ride and video terrain give you something to chase. It broadcasts your speed and cadence so apps can track your effort. The important caveat, and the main line between this and a true smart bike, is that the resistance is manual: when an app suggests a harder section, you turn the dial yourself rather than the bike changing electronically. For most home riders that is a perfectly good trade for the money you save. JOROTO lists the full specification on its official product page if you want to confirm the exact details before buying.
On value, the X4S is a strong buy. It offers the heavy, quiet, repeatable ride that makes premium bikes enjoyable, at a price hundreds of pounds below the big connected names. You give up automatic resistance and a built-in screen, but you bring your own phone or tablet and keep the cash. For a rider who wants quality indoor cycling without the smart-bike premium, it is one of the better-value options on Amazon UK. See how it compares in our best spin bike guide, and if you are weighing cardio machines in general, our exercise bikes hub is a good next stop.
If you want a sturdy, quiet indoor cycling bike with app support and a readable resistance dial, the X4S is strong value at around its usual price. It undercuts big-name smart bikes by hundreds of pounds while keeping a heavy flywheel feel and belt drive. It only stops being worth it if you specifically need auto-adjusting resistance or a large built-in screen, which this bike does not have.
The X4S has Bluetooth and works with app support through platforms such as Kinomap, which can adjust to the terrain in a video ride. It broadcasts speed and cadence data, but it is not a full smart bike with automatic electronic resistance, so on apps like Zwift you change the resistance yourself using the dial rather than the app controlling it for you.
The X4S uses a dual flywheel setup with magnetic resistance rather than a single very heavy wheel. The result is a smooth, weighted ride feel comparable to bikes with a heavier single flywheel, without the friction pad wear you get on cheaper felt-brake bikes. Most owners describe the ride as stable and momentum-rich.
Yes. Because it uses magnetic resistance and a belt drive rather than a felt friction pad and chain, it runs quietly. You can comfortably use it near a sleeping household or watch television over it. It is not completely silent, as the drive and your pedalling make some noise, but it is far quieter than budget friction bikes.
The X4S is rated to a maximum user weight of around 150kg (330lb), which is generous for a home spin bike and higher than many rivals at this price. The wide, stabilised frame also feels planted during hard out-of-the-saddle efforts, which is where flimsier bikes tend to rock.
Yes, and it is one of its best features. The X4S has a readable magnetic resistance system with a numbered dial and display, so you can dial in and repeat an exact resistance level. Many spin bikes only have a vague tension knob, so being able to see and reproduce your setting makes structured training much easier.
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