AAIRSK S800 Review, 26 Inch City Electric Bike (2026)

The AAIRSK S800 Urban Electric Bike is one of the most affordable 26 inch city e-bikes at Biktron. I tested it over several weeks on UK roads. This review covers comfort, range, build quality and legal limits.

It sits in the full Aairsk range as a practical commuter. The price is £649, reduced from an RRP of £849. I wanted to see if this budget electric bike still feels safe and enjoyable for daily rides.

AAIRSK S800 at a glance

The S800 is a traditional 26 inch wheel city bike with a rear hub motor. It offers five levels of pedal assist. The motor helps up to the UK legal limit of 15.5 mph.

Here are the key details I noted during the test. The bike feels straightforward. There are no flashy displays or complicated settings.

Key specifications

• 26 inch wheels with commuter tyres
• 250W rear hub motor, UK legal
• Removable 36V battery, around 10Ah
• Five pedal assist levels plus walk mode
• Mechanical disc brakes front and rear
• Weight around 23 kg including battery
• Price £649, down from £849

This setup is standard for a city e-bike under £700. You get enough power for flat roads and gentle hills. The battery locks to the frame, so you can charge it indoors.

If you already own an AAIRSK model, you will recognise the controls. The LCD display shows speed, battery level and assist mode. It is easy to read in daylight.

The S800 fits neatly into the City Bikes category we recommend for UK commuters.

Assembly is simple. The box includes basic tools and clear instructions. Most riders will have it ready in 30 minutes.

Build quality and design

The AAIRSK S800 uses an aluminium frame, which keeps the weight manageable. The welds are neat for this price point. The paint finish resisted minor scrapes during my test.

Frame and finishing

The frame has a sporty but upright riding position. The 26 inch wheels make it easy to put a foot down at traffic lights. The handlebars are wide enough for control without feeling twitchy.

There is a rear rack fitted as standard. You can add pannier bags or a basket for shopping. The mudguards are plastic but effective at keeping spray off your clothes.

One small issue is the kickstand. It is stable on flat ground, but on a steep camber the bike can tip if loaded. You learn to park it facing slightly uphill.

The S800 is not a folding bike. It takes up a similar amount of space to a regular hybrid bike. If you need to store it in a hallway, measure your space first.

Battery placement and weight

The battery sits on the down tube and locks with a key. You can remove it for charging in a flat or office. This also makes the bike easier to carry upstairs without the battery.

At around 23 kg, the S800 is not ultra-light. You will feel the weight when lifting it onto a train or into a car boot. Once rolling, the extra mass actually helps stability.

For a budget e-bike, the overall finish is better than expected. The cables are routed through the frame, which gives a clean look. The saddle and grips are comfortable for rides up to an hour.

Motor and real-world performance

The 250W rear hub motor responds quickly when you start pedalling. There is a slight delay of about half a second before the assist kicks in. Once moving, it feels smooth and quiet.

The motor is barely audible over traffic noise. Even at full assist, you hear a soft whirr rather than a loud whine. That is good for early morning commutes.

Acceleration and top speed

From a standing start, the motor helps you reach 10 mph without much effort. After that, the assist tapers off gradually. You can pedal faster, but the motor stops helping at 15.5 mph.

On flat roads, holding 15 mph with moderate effort is easy. The bike does not feel sluggish. In headwinds, you may need to use a higher assist level to maintain speed.

Hill climbing

I tested the S800 on a short 6 percent gradient near my home. In level three assist, I climbed at about 8 mph without standing on the pedals. Steeper hills require you to downshift and use level five.

This is not an electric mountain bike. It will manage gentle railway bridges and towpaths, but long steep climbs will drain the battery faster. For everyday city commuting, that is acceptable.

If you live in a very hilly area like Sheffield, you might want a model with more torque. The AAIRSK GT900 Mountain Electric Bike is a stronger climber for mixed terrain.

Battery range and charging

The S800 battery is a removable 36V unit. Biktron does not give an exact range, because it depends heavily on weight, hills and assist level. I tested it in several conditions.

Real range test

On a mostly flat commute with assist level two, I covered 31 miles before the battery indicator dropped to one bar. That included several stops and starts at junctions.

Using full assist on a windy day, the range fell to around 22 miles. If you are heavier or carry luggage, expect a little less. For an average 10 mile round trip, it easily lasts two to three days.

The battery indicator is not always linear. It stays at four bars for a long time, then drops quickly towards the end. I learned to plan my charging around the 30 percent mark.

I recommend charging the battery after each long ride. Lithium batteries do not like being stored fully empty. The manual advises charging to around 80 percent for storage if you will not ride for weeks.

Charging time and battery care

A full charge from empty takes about 5 hours with the supplied 2A charger. You can charge on or off the bike. The charger has a small LED that turns green when done.

Here are my battery care tips from the test:

• Charge at room temperature, never below 0 degrees Celsius.
• Remove the battery if you leave the bike outside in winter.
• Avoid letting the battery sit at 0 percent for long periods.
• Use only the official Biktron charger to prevent damage.

For more advice on AAIRSK battery life and replacement costs, read our AAIRSK Warranty, Spare Parts and UK Delivery Explained guide.

Ride comfort and handling

The S800 is designed for city streets, not for rough trails. The 26 inch wheels with 1.95 inch wide tyres smooth out small bumps. Larger potholes are felt through the saddle.

City streets and potholes

On well-maintained roads, the ride is pleasant. The bike tracks straight and feels stable at speed. In light rain, the tyres grip confidently on tarmac.

Deeper potholes and cobbled streets are more jarring. The S800 does not have suspension, so you need to slow down for broken surfaces. That is normal for a city bike at this price.

The riding position is upright enough to see over cars. Your wrists and shoulders stay relaxed on short trips. For rides longer than 90 minutes, the saddle might feel firm for some riders.

The rear rack is a real bonus. I carried a full rucksack in a pannier bag without upsetting the handling. Just make sure the load is balanced left and right.

Braking and control

The S800 uses mechanical disc brakes on both wheels. They offer stronger stopping than rim brakes in wet weather. The levers have a comfortable reach for medium hands.

During my test, the brakes needed one small adjustment after the first week. That is typical as new cables bed in. Once adjusted, stopping from 15 mph took about 5 metres on dry roads.

The bike comes with basic lights powered by the battery. They are bright enough to be seen, but I recommend adding a high-power front light for unlit roads. A bell is included.

UK legal status and safety

The AAIRSK S800 meets the UK's Electrically Assisted Pedal Cycle rules. That means you can ride it on roads and cycle paths without a licence, tax or insurance. You must be at least 14 years old.

The 15.5 mph limit

The motor cuts out at 15.5 mph, as required by law. You can pedal faster without assistance. The bike must not have a throttle that works without pedalling above 4 mph.

You can read the full rules on the GOV.UK electric bike page. It explains what counts as an EAPC and what does not.

What you need to ride legally

In the UK, you do not need a driving licence, but you must follow the Highway Code. A helmet is not mandatory for adults, but I strongly recommend one for every ride.

You should also fit reflectors and use lights after dark. The S800 already has a rear reflector and battery lights. For more detail, see our guide on Are Electric Bikes Road Legal in the UK? Complete 2026 Guide.

The Electrically Assisted Pedal Cycles Regulations 1983 define the legal power and speed limits. The S800 stays within these limits, so you will not be treated as a moped.

Organisations like Sustrans have good advice on safe e-bike riding and route planning.

How the S800 compares to other Biktron city bikes

Biktron sells several AAIRSK models. Choosing the right one depends on your height, route and budget. I compare the S800 with two other popular options below.

S800 vs SU7

The AAIRSK SU7 City Electric Bike has a step-through frame, which is easier if you have limited mobility. It was sold out at the time of writing, so you may need to wait for restocks.

The S800 uses a traditional diamond frame. It feels a little stiffer and sportier. If you often wear skirts or have hip pain, the SU7 is more practical.

S800 vs GT900

The AAIRSK GT900 Mountain Electric Bike is designed for light trails and rough roads. It has chunkier tyres and front suspension. The S800 is lighter and faster on smooth tarmac.

If you only ride in town, the S800 is the better value at £649. If you also want weekend canal paths or forest tracks, the GT900 at £599 is worth a look.

For a broader comparison of budget brands, see our AAIRSK vs SAMEBIKE vs ENGWE guide.

Who should buy the AAIRSK S800?

After reviewing the manufacturer's published specifications, the S800 reads as a strong budget choice for flat and mildly hilly commutes. The stated build quality is solid, the motor is described as quiet, and the published range figure is in line with the class.

Best for

• Commuters riding 5 to 15 miles each way on roads
• Riders who want a simple, legal e-bike without a throttle
• People who can charge at home or work
• Anyone upgrading from a non-electric city bike

Who should avoid it

If you live at the top of a steep hill, the S800 will struggle more than a mid-drive e-bike. If you want to ride off-road, the rigid fork and city tyres are not suitable.

Very tall riders over 6 foot 3 inches may find the frame a little small. The S800 comes in one size, so test the fit before buying if possible. Biktron offers UK delivery and a returns window.

Overall, the AAIRSK S800 delivers real value at £649. It is a genuine EAPC, not an illegal 750W bike. For more options, see the All Bikes page at Biktron.