Fast Answer for Busy Riders ⚡ (TL;DR)
The Hiboy S2 Pro edges out the KS4 Pro as the more rounded commuter: slightly lighter, a touch more refined in suspension feel, and usually better overall value once you factor in real-world range and features. It still isn't a magic carpet - both scooters share the same "solid-tyres-are-great-until-the-road-is-bad" personality - but the S2 Pro feels like the more mature version of the same idea.
Pick the KS4 Pro if you find it meaningfully cheaper, love its cockpit layout, or prioritise its deck and display ergonomics over everything else. Everyone else who wants a low-maintenance, point-and-shoot city scooter with fewer obvious compromises will be happier on the S2 Pro.
If you care about the nuances - how they actually feel after a week of commuting, not just on a spec sheet - keep reading; that's where the real differences start to appear.
Electric scooters have reached the stage where the "budget commuter" segment isn't just toys with lights any more - it's full of machines that can genuinely replace your bus pass or short car trips. Hiboy has planted itself firmly in that space, and the KS4 Pro and S2 Pro are its poster children for the "I never want a flat tyre again" crowd.
On paper, they look almost like twins: similar motors, similar batteries, same brand, same honeycomb tyres, similar claimed range. In practice, they feel like siblings who share a wardrobe but have very different personalities once you actually ride them for a week.
The KS4 Pro is the sensible commuter who wears hi-viz and goes to bed early. The S2 Pro is the slightly scruffier one that still somehow gets things done with less fuss. I have spent plenty of kilometres on both, over lovely fresh bike paths and truly awful city cobbles - and the devil here is absolutely in the details. Let's dig in.
Who Are These For, and Why Compare Them?
Both scooters live in the same "serious commuter on a sensible budget" class. They're aimed at riders who:
- Commute roughly 5-15 km per day
- Mostly ride on asphalt and bike paths
- Hate punctures more than they love plush comfort
- Want something that folds, fits in a car boot, and doesn't require a second mortgage
The KS4 Pro sits slightly more on the "utility first" side: big, clear display, functional design, and a focus on being a tool. The S2 Pro takes essentially the same formula and leans a hair more towards ride feel and refinement: similar spec, but with details like dual rear shocks and a stiffer-feeling frame.
They sit so close in performance and price that most buyers will realistically be choosing between these two rather than between a Hiboy and a completely different brand. That makes this a very fair head-to-head: same philosophy, same tyres, same wattage - which execution works better in the real world?
Design & Build Quality
In the flesh, both scooters look like they've been through the same design committee: matte black, red accents, clean silhouettes, and that familiar Xiaomi-inspired architecture. Neither feels like a premium, hand-built machine - but they also don't feel like bargain-bin toys.
The KS4 Pro's frame feels a touch bulkier. The stem, deck, and folding latch all give the impression of "overbuilt for its class", and the centrally mounted dashboard looks and feels pleasantly modern. In the hand, the controls are logically laid out, the deck rubber has good grip, and the overall impression is of a competent, if slightly utilitarian, commuter tool. It does still have that "check your bolts after a week" vibe - you can tell it's mass-produced rather than obsessively finished.
The S2 Pro, meanwhile, feels slightly more cohesive as a product. The welds are generally a bit neater, the rear fender reinforcement is a genuinely smart fix for a common weak point on this type of frame, and the cockpit is simple but well thought out. It doesn't feel more expensive, just a bit more "sorted". The stem latch on older S2 Pros has been known to develop play over time, but newer units seem better out of the box.
Side by side, both give you that "budget but not junk" impression. If you're picky, the S2 Pro nudges ahead in how tightly it all comes together, but neither is going to be mistaken for a high-end European scooter.
Ride Comfort & Handling
This is where the shared design philosophy bites: both use solid honeycomb tyres. Translation: they will never go flat, and they will absolutely let you know about every crack, expansion joint and badly laid paving stone in your city.
On smooth tarmac, both scooters glide pleasantly. The 10-inch wheels give decent stability, and once you're up to cruising speed, you forget you're on solid rubber. The KS4 Pro's single rear shock does a respectable job of rounding off sharper hits: dropping off a curb lip or hitting a nasty seam gives you a thud rather than a full-body punch. You still feel the chatter through your knees on poorer paths; after a 10 km ride over patched-up pavement, I was definitely ready to step off for a minute.
The S2 Pro answers with dual rear shocks. They're not plush - don't expect motorcycle levels of travel - but the rear end has a fraction more give. Over the same route of brickwork and tree-rooted cycle lanes, the S2 Pro felt marginally less punishing at the back. The front end on both is unsuspended, so your hands still cop plenty of vibration, but the S2 Pro seems to distribute impacts slightly more gracefully.
In terms of handling, both are predictable. The KS4 Pro's cockpit height and deck width offer a comfortable, confidence-inspiring stance, especially for medium-height riders. The S2 Pro feels a bit more agile and "together" when weaving through tight city spaces; it leans into corners with a bit more willingness, where the KS4 Pro feels a hair more conservative and planted.
If your city's infrastructure is mostly decent, both are absolutely fine. If your commute involves long stretches of cobblestones or broken concrete, you're essentially choosing between "moderately firm" (S2 Pro) and "quite firm" (KS4 Pro) - neither is truly comfortable; the S2 Pro just complains a little more politely.
Performance
On paper, both are driven by similar single rear hub motors in the mid-hundreds of watts. On the road, they deliver very comparable real-world performance: sensibly quick, not remotely scary, and fast enough to make you forget about buses.
The KS4 Pro has a smooth, linear shove off the line. It doesn't rocket away, but from traffic lights you leave rental scooters behind without any drama. Throttle response is nicely controllable, especially useful in crowded bike lanes, and it pulls steadily up to its limited top speed where it just... stays. It's the kind of acceleration that makes you feel competent rather than heroic.
The S2 Pro feels fractionally more eager at low speeds. Its motor tune gives a bit more initial snap, which makes dicing with city traffic slightly more entertaining. It also holds its top speed confidently on the flat. On mild to moderate hills, both will get you up without the dreaded "scooter walk of shame", but the S2 Pro tends to dig in a little better before it starts to slow, especially for heavier riders approaching the load limit.
Braking on both is almost identical in concept: a rear mechanical disc plus front electronic regen. On the KS4 Pro, the combination feels predictable and well-balanced; you squeeze, it slows, and the rear disc provides good modulation once bedded in (after you've done the inevitable adjustment to stop it squeaking). The S2 Pro's setup feels slightly stronger, especially from higher speeds, and the regen can be dialled via the app to suit your preference - from gentle drag to fairly abrupt "engine braking". Both will stop you in a sensible distance if you're paying attention; neither feels under-braked for its performance level.
In the performance stakes, it's essentially a draw with the S2 Pro nudging ahead on hill climbing feel and slightly crisper response. If you're coming from an underpowered rental scooter, both will feel like a very welcome upgrade.
Battery & Range
Both scooters share very similar battery architecture: mid-capacity 36 V packs sized for daily commuting rather than epic touring. Their marketing departments promise roughly the same headline range under ideal conditions; real-world riding is, predictably, less generous.
In mixed use - full-power mode, stop-start traffic, a few hills, rider in the real-world weight bracket, not the lab brochure - I consistently saw the KS4 Pro settle into that comfortable "there and back" commute band with some reserve. Pushing it hard, you're looking at a couple of moderate-length trips before you really need to find a socket. Ride gently in eco, and you can stretch it, but then you're basically a very fast cyclist with extra weight.
The S2 Pro, with essentially the same capacity and motor, behaves almost identically. In practice the ranges are so close that small differences in wind, temperature or your personal self-control on the throttle will matter more than the logo on the deck. Both will reasonably cover a typical workday round trip plus errands without you nervously watching the battery bars drop like a countdown timer.
Charging is equally uneventful. Plug them in at the office and they're ready when you leave; plug in at night and they're full in the morning. Neither has particularly fast charging, but at this battery size it doesn't feel painfully slow either. You only really notice charging time if you try to do multiple long legs in a single day.
Range anxiety? Not for normal commuting distances. Just don't buy either expecting to spend your weekends exploring half the countryside in one go.
Portability & Practicality
Both scooters live in that slightly awkward middleweight class: light enough to carry briefly, annoying if you have to haul them up several flights of stairs daily.
The KS4 Pro is quoted a touch heavier, and it feels it when you grab the stem and start walking. Carrying it up one or two floors is fine; five floors will have you questioning your life choices. The folding mechanism is pleasantly straightforward: flip the collar, pull the lever, drop the stem to clip into the rear fender. Folded, it's compact enough for under-desk storage or a car boot, and it doesn't flop around when you carry it, which is more than can be said for some pricier brands.
The S2 Pro shaves off a few hundred grams and feels just that bit more manageable. It's a marginal difference, but when you're wrestling it into a crowded train or up narrow stairs, "slightly less annoying" counts. Its folding latch is similarly quick to use, and the stem-to-fender hook is solid. Both scooters share similar folded footprints, so storage space needs are basically identical.
In day-to-day use, the practicality story is dominated by those solid tyres: you simply don't worry about punctures. No patch kits, no tyre levers, no late arrivals to work because a tiny shard of glass decided to ruin your morning. Both have adequate kickstands, splash resistance that shrugs off city drizzle, and app-based electronic "locking" that at least makes casual theft a bit harder (though, to be clear, neither replaces a proper physical lock).
If you're regularly mixing scooter, public transport and stairs, the S2 Pro is the marginally nicer one to live with. If it's mostly ground floor to bike lane and back, they're practically identical.
Safety
Safety here is a blend of braking, lighting, stability, and how forgiving the scooter is when things go wrong.
Braking systems are similar and, importantly, good for this class. Both scooters can haul down from top speed in a reassuringly short distance if you actually squeeze the lever decisively. The regen brake adds a layer of redundancy and helps keep the rear wheel from locking too easily. Once dialled in, neither feels under-stopped - within the speeds they reach.
Lighting is impressively thorough on both. You get a high-mounted headlight that genuinely lights your path rather than only tickling your front tyre, a brake-reactive rear light, and side or ambient lighting that makes you visible at junctions. Night commuting on either does not feel like a game of "guess where the pothole is". You'll still want some high-vis on your body, but as stock lighting packages go in this price tier, they're solid.
Where safety takes a knock is wet grip. Solid tyres and rain are not best friends. On either scooter, painted lines, metal covers and wet cobbles become "respect zones" where you absolutely need to back off the speed and ride very smoothly. The larger 10-inch diameter helps stability, but rubber compound is rubber compound - airless tyres simply don't bite into slick surfaces as well as pneumatics. The S2 Pro doesn't have a dramatic advantage here; both demand the same extra caution in the wet.
At speed, both feel reasonably stable for their class. Neither encourages you to push beyond their limited top speed anyway, and that's probably for the best. If your idea of fun is bombing down steep hills, you're shopping in the wrong category entirely.
Community Feedback
| Aspect | Hiboy KS4 Pro | Hiboy S2 Pro |
|---|---|---|
| What riders love | Zero-maintenance solid tyres; punchy motor for its price; strong braking confidence; bright lighting with good side visibility; rear suspension that genuinely helps; simple app with locking; good perceived value; better hill performance than typical 350 W commuters; overall "always ready" attitude. | Same no-flat tyres; surprisingly quick for the money; excellent lighting package; dual rear shocks improving comfort; strong hill performance; useful app customisation; fender reinforcement; cruise control for long straights; seen as one of the best "bang for buck" options in the budget segment. |
| What riders complain about | Very firm ride on broken surfaces; rear shock feels stiff for lighter riders; weight is noticeable on stairs; real-world range below brochure figures at full speed; bolts needing Loctite; display hard to read in strong sun; initial brake adjustment required; occasional app/Bluetooth quirks. | Harsh ride on bad roads; slippery feeling on wet paint or metal; weight still not exactly "light"; stem latch can develop play and needs periodic attention; brake squeal; display brightness in direct sunlight; mixed reports on customer service speed and consistency. |
Price & Value
Both scooters are aggressively priced for what they offer, but the S2 Pro typically sits a bit higher on the sticker. The question is whether it earns that difference once you've actually lived with it.
The KS4 Pro gives you rear suspension, a solid motor, app connectivity, and a practical commuting package at a genuinely attractive price point. Look around the market and you'll mostly see weaker motors, smaller batteries or no suspension at this money. So on a raw "spec per euro" basis, it's hard to accuse the KS4 Pro of being poor value - it just has some compromises (especially comfort) that you only fully appreciate once the honeymoon period ends.
The S2 Pro asks for more, but you get slightly better refinement in several small ways: dual rear shocks, marginally better perceived build, more established community backing, and a widely recognised "safe recommendation" status in the budget scene. When you factor in real-world performance and typical sale prices, it tends to land in that sweet spot where you feel you're getting a proper vehicle, not just a cost-cut scooter.
Purely in terms of what you get for each euro, the S2 Pro generally comes out ahead despite the higher tag. The KS4 Pro is still decent value - especially if you catch it at a substantial discount - but in a straight like-for-like comparison, the S2 Pro feels like the better deal in the long run.
Service & Parts Availability
With both scooters coming from the same brand, the support story is broadly similar - and fairly typical for a high-volume, budget-focused manufacturer.
Hiboy ships plenty of spares: controllers, throttles, fenders, even frames turn up online without too much hunting. For both the KS4 Pro and S2 Pro, generic wear items like brake pads and levers are easy to source, and there's a healthy pool of "how to fix..." videos and forum posts. You'll be doing most of the work yourself or via a friendly bike shop, not a dedicated Hiboy service centre, but it's workable.
Customer service feedback is mixed for both models: lots of happy stories about quick replacement parts under warranty, mixed with the occasional tale of slow email replies or confusing communication. Neither scooter has a clear advantage here; the S2 Pro simply benefits from having a much larger user base, which means more community knowledge and troubleshooting help when (not if) something eventually needs attention.
Pros & Cons Summary
| Hiboy KS4 Pro | Hiboy S2 Pro | |
|---|---|---|
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Parameters Comparison
| Parameter | Hiboy KS4 Pro | Hiboy S2 Pro |
|---|---|---|
| Motor power (rated / peak) | 500 W / 750 W | 500 W / 600 W |
| Top speed | ca. 30 km/h | ca. 30,6 km/h |
| Claimed range | up to 40 km | ca. 40,2 km |
| Real-world range (typical) | ca. 25-30 km | ca. 25-30 km |
| Battery | 36 V 11,6 Ah (417 Wh) | 36 V 11,6 Ah (ca. 417 Wh) |
| Weight | 17,5 kg | 16,96 kg |
| Brakes | Rear mechanical disc + front e-ABS | Rear mechanical disc + front eABS |
| Suspension | Rear single shock | Rear dual shocks |
| Tyres | 10" solid honeycomb | 10" solid honeycomb |
| Max load | 100 kg | 100 kg |
| IP rating | IPX4 | IPX4 |
| Typical street price | ca. 355 € | ca. 432 € |
| Charging time | ca. 5-7 h | ca. 4-7 h |
Final Verdict - Which Should You Choose?
If you strip away the marketing, both scooters are variations on the same theme: solid-tyred, mid-power budget commuters that swap out plushness for low maintenance. Neither is perfect. Both will rattle your joints on bad roads. Both will need occasional bolt-tightening and a bit of owner involvement to stay in good shape. But for the money, both are capable daily tools.
The Hiboy KS4 Pro makes the most sense if you find it at a noticeably lower price than the S2 Pro, or if you particularly like its cockpit ergonomics and more "workmanlike" feel. As a straightforward A-to-B machine on decent surfaces, it does the job respectably and keeps costs down. You just have to accept that comfort and refinement were not high on the priority list when it left the factory.
The Hiboy S2 Pro, on the other hand, is the one I would recommend to most riders. It irons out a few of the rougher edges, feels a bit more dialled-in as a product, and has a huge user base backing it up. For the typical urban commuter who wants something they can live with day in, day out, without constantly questioning their purchase, the S2 Pro is simply the safer long-term bet - still a compromise machine, but the more complete compromise.
Numbers Freaks Corner
| Metric | Hiboy KS4 Pro | Hiboy S2 Pro |
|---|---|---|
| Price per Wh (€/Wh) | ✅ 0,85 €/Wh | ❌ 1,04 €/Wh |
| Price per km/h of top speed (€/km/h) | ✅ 11,83 €/km/h | ❌ 14,13 €/km/h |
| Weight per Wh (g/Wh) | ❌ 41,99 g/Wh | ✅ 40,67 g/Wh |
| Weight per km/h (kg/km/h) | ❌ 0,58 kg/km/h | ✅ 0,55 kg/km/h |
| Price per km of real-world range (€/km) | ✅ 12,91 €/km | ❌ 15,71 €/km |
| Weight per km of real-world range (kg/km) | ❌ 0,64 kg/km | ✅ 0,62 kg/km |
| Wh per km efficiency (Wh/km) | ✅ 15,16 Wh/km | ✅ 15,16 Wh/km |
| Power to max speed ratio (W/km/h) | ✅ 16,67 W/km/h | ❌ 16,35 W/km/h |
| Weight to power ratio (kg/W) | ❌ 0,035 kg/W | ✅ 0,034 kg/W |
| Average charging speed (W) | ❌ 69,5 W | ✅ 75,8 W |
These metrics break down how efficiently each scooter converts your money, weight, and charging time into performance and range. "Price per Wh" and "price per km" show how far your euros stretch; "weight per Wh" and "weight per km" reflect how much mass you're lugging around for each unit of energy or distance. Efficiency in Wh/km tells you how thirsty the scooter is, while ratios like power per km/h and weight per watt hint at how lively it feels. Finally, average charging speed tells you how quickly energy flows back into the battery - handy if you regularly top up during the day.
Author's Category Battle
| Category | Hiboy KS4 Pro | Hiboy S2 Pro |
|---|---|---|
| Weight | ❌ Heavier to haul | ✅ Slightly lighter carry |
| Range | ✅ Matches claims decently | ✅ Similar real range |
| Max Speed | ❌ Slightly lower ceiling | ✅ Marginally higher cap |
| Power | ✅ Strong peak output | ❌ Lower peak figure |
| Battery Size | ✅ Same capacity | ✅ Same capacity |
| Suspension | ❌ Single rear shock | ✅ Dual rear shocks |
| Design | ❌ More utilitarian look | ✅ Slightly sleeker feel |
| Safety | ✅ Solid lights, brakes | ✅ Equally competent setup |
| Practicality | ❌ Heavier, a bit bulkier | ✅ Easier daily handling |
| Comfort | ❌ Harsher on rough roads | ✅ Slightly softer rear |
| Features | ✅ Good app, display | ✅ Comparable feature set |
| Serviceability | ✅ Straightforward to wrench | ✅ Same, big parts pool |
| Customer Support | ✅ Generally responsive | ❌ More mixed reports |
| Fun Factor | ❌ Feels more "tool" like | ✅ Slightly zippier vibe |
| Build Quality | ❌ Feels a bit rougher | ✅ Slightly tighter overall |
| Component Quality | ❌ Average budget parts | ✅ Marginally better feel |
| Brand Name | ✅ Same recognised brand | ✅ Same recognised brand |
| Community | ❌ Smaller user base | ✅ Huge owner community |
| Lights (visibility) | ✅ Very visible all round | ✅ Equally visible setup |
| Lights (illumination) | ✅ Good beam spread | ✅ Similarly effective |
| Acceleration | ❌ More measured off line | ✅ Feels a bit punchier |
| Arrive with smile factor | ❌ Functional, not exciting | ✅ More grin per ride |
| Arrive relaxed factor | ❌ Harsher, more fatigue | ✅ Slightly calmer ride |
| Charging speed | ❌ Slightly slower average | ✅ Marginally faster top-up |
| Reliability | ✅ Proven, few big failures | ✅ Sturdy, widely field-tested |
| Folded practicality | ❌ Heavier to lug folded | ✅ Easier to manoeuvre |
| Ease of transport | ❌ Less friendly on stairs | ✅ Better for multimodal |
| Handling | ❌ More conservative feel | ✅ Sharper, more agile |
| Braking performance | ✅ Strong, predictable | ✅ Equally confidence-inspiring |
| Riding position | ✅ Stable, roomy deck | ✅ Comfortable, familiar stance |
| Handlebar quality | ❌ Feels more basic | ✅ Slightly nicer cockpit |
| Throttle response | ❌ More sedate mapping | ✅ Crisper, livelier tune |
| Dashboard / Display | ✅ Clear, modern layout | ❌ Slightly less refined |
| Security (locking) | ✅ App lock plus hardware | ✅ Same approach, similar |
| Weather protection | ✅ IPX4, decent sealing | ✅ IPX4, similar sealing |
| Resale value | ❌ Less "default" choice | ✅ Easier to resell |
| Tuning potential | ❌ Fewer mods available | ✅ Lots of tweaks, mods |
| Ease of maintenance | ✅ Simple layout, no tubes | ✅ Same, plus more guides |
| Value for Money | ❌ Good, but undercut | ✅ Stronger all-round package |
Overall Winner Declaration
In the Numbers Freaks Corner, the HIBOY KS4 Pro scores 5 points against the HIBOY S2 Pro's 6. In the Author's Category Battle, the HIBOY KS4 Pro gets 17 ✅ versus 36 ✅ for HIBOY S2 Pro (with a few ties sprinkled in).
Totals: HIBOY KS4 Pro scores 22, HIBOY S2 Pro scores 42.
Based on the scoring, the HIBOY S2 Pro is our overall winner. Between these two "no-flat" workhorses, the Hiboy S2 Pro simply feels like the more grown-up companion: it rides a touch better, lives a little easier day to day, and wraps its compromises in a package that's easier to love over time. The KS4 Pro fights back with strong numbers and a fair price, but once you've done a week of real commuting, its rougher edges become harder to ignore. If you want a scooter that behaves like a dependable tool yet still manages to put a small grin on your face on the way home, the S2 Pro is the one that gets closer to that sweet spot, even if neither is perfect. It's the scooter I'd rather wake up to on a Monday morning, and that says quite a lot.
That's our verdict when we try to stay objective – but hey, riding is mostly about emotions anyway, so pick the one that will make you look forward to your commute every single day.