The short version
- Best for leisure and mixed-surface rides where familiar bicycle handling and seven gears matter more than low weight
- 250W rear-hub motor with assistance claimed to 25km/h
- 36V 10Ah removable concealed battery, approximately 360Wh; Amazon metadata also shows an inconsistent 468Wh figure
- Main trade-off: 26kg is heavy
Where the GT300 fits
A conventional 26-inch hardtail-style e-bike with a 360Wh hidden battery, seven gears, a lockable fork and card-key display. At 26kg it is no lightweight, and the Amazon page contains a battery-energy inconsistency that buyers should resolve before purchase.
The best match is leisure and mixed-surface rides where familiar bicycle handling and seven gears matter more than low weight. Compare the exact Amazon UK listing with the manufacturer specification, independent sources where available and the public rating snapshot before choosing a variant.

Motor, controls and UK legality
The supplied listing describes 250W rear-hub motor with assistance claimed to 25km/h. In Great Britain, an electrically assisted pedal cycle must meet more than a headline wattage: the motor's maximum continuous rated power must not exceed 250W, assistance must cut out by 15.5mph and the bicycle must normally be propelled through its pedals.
The Amazon UK listing states 250W and 25km/h, which match two headline EAPC limits if the wattage is the motor's maximum continuous rating. The delivered labels and assistance behaviour still control the legal assessment.
Aairsk's global GT300 page describes a higher-power and faster regional version, so it cannot be used to establish the specification of this UK ASIN. Confirm whether the card-key display exposes any non-pedal or derestricted mode.
| Motor | 250W rear-hub motor with assistance claimed to 25km/h |
|---|---|
| Battery | 36V 10Ah removable concealed battery, approximately 360Wh; Amazon metadata also shows an inconsistent 468Wh figure |
| Claimed range | up to 40km in the reviewed Amazon UK configuration |
| Transmission | seven-speed derailleur drivetrain |
| Brakes | front and rear mechanical disc brakes |
| Tyres | 26-inch mixed-surface tyres; exact width is not reliably disclosed |
| Suspension | adjustable lockable front suspension fork |
| Listed weight | 26kg listed |
| Maximum load | 120kg listed |
| Fit | minimum rider-height guidance of 150cm; verify reach and stand-over before purchase |
Battery, charging and realistic range
The listed battery is 36V 10Ah removable concealed battery, approximately 360Wh; Amazon metadata also shows an inconsistent 468Wh figure, with up to 40km in the reviewed Amazon UK configuration. Range is not a fixed property. Hills, temperature, rider and luggage mass, soft tyres, frequent acceleration and high assistance can all reduce the distance substantially.
Use only the approved compatible charger, charge away from escape routes and stop using a pack that is damaged, swollen, leaking or unusually hot. Before buying a marketplace e-bike, ask for battery and charger documentation, a replacement price and a clear UK warranty route.
Ride, handling and braking
The GT300's 26-inch wheels and moderate tyres should feel closer to a normal hybrid or basic mountain bike than the X5. A lockable fork is useful on smoother roads, though an inexpensive steel fork adds weight.
Seven gears cover ordinary cadence changes, while mechanical discs keep consumables simple. Boxed assembly quality matters: wheel tension, rotor alignment and derailleur indexing should be checked before longer rides.

Equipment and everyday practicality
The core equipment is seven-speed derailleur drivetrain, front and rear mechanical disc brakes, 26-inch mixed-surface tyres; exact width is not reliably disclosed and adjustable lockable front suspension fork. The listed weight is 26kg listed, while the maximum-load information is 120kg listed. Fit guidance is minimum rider-height guidance of 150cm; verify reach and stand-over before purchase.
A nominal 360Wh pack suits shorter journeys, and the 40km claim is more conservative than some marketplace headlines. The contradictory 468Wh metadata means buyers should verify the actual voltage, amp-hours and label on arrival.
At 26kg, the GT300 is still awkward on stairs. The card-key start system is distinctive but creates another proprietary part whose replacement availability should be confirmed.
What the available reviews tell us
The Amazon UK listing showed 3.4 out of 5 from 4 ratings. Ratings change, variants can share a review pool and a score cannot prove road legality, correct assembly or long-term battery health.
The Amazon variant showed four ratings averaging 3.4/5. That is too small for a stable owner consensus and is mixed enough to justify careful inspection during the return period.
The shared GT300/GT900 parent page can also mix variant information. Match reviews, selected colour or style and embedded ASIN before drawing conclusions.

Advantages and disadvantages
The useful question is not whether the specification looks generous in isolation, but whether its strengths match the route and its compromises are acceptable in storage, servicing and daily use.
- Advantage: Conventional 26-inch bicycle layout
- Advantage: Seven gears
- Advantage: Lockable front fork
- Advantage: Card-key display and removable battery
- Disadvantage: 26kg is heavy
- Disadvantage: Battery-energy metadata conflicts
- Disadvantage: Small mixed rating sample
- Disadvantage: Global and UK specifications differ
Ownership checks and RideIn verdict
Confirm the seller of record, exact ASIN, frame and motor labels, assistance cut-off, throttle behaviour, battery documentation, return address and written warranty. Arrange professional assembly or at least a safety inspection of the wheels, brakes, folding joints where fitted, controls and electrical connections.
The GT300 is easier to understand than Aairsk's moped-style X5, but it is not automatically the safer purchase. It is reasonable for modest leisure use only after the exact 250W UK configuration, battery label and boxed assembly have been verified.
Sources used for this review
Product pages establish the listed configuration. Manufacturer and independent sources add context but may cover a different regional version. All outbound links are marked nofollow.
- Amazon UK Aairsk GT300 listing↗Exact parent ASIN, selected GT300 configuration and rating snapshot.
- Aairsk GT300 product page↗Official global configuration; power and speed differ from the reviewed UK variant.
- GOV.UK electric-bike rules↗
- UK Government e-cycle battery safety↗
- UK product-safety alerts and recalls↗