Aairsk XT90 Electric Mountain Bike – 48V 20Ah, 250W Road Legal, Dual Suspension

The Aairsk XT90 is the longest-range bike in the Aairsk line-up — a 48V 20Ah battery paired with dual suspension, 26-inch wheels and Shimano 21-speed gearing. £649.99 with free UK mainland delivery.

Held in UK stock, so there is no import wait and no customs charge when it arrives — typically 3–5 working days, often faster.

How fast does it go?

The XT90 has a selectable power specification, and this matters before you buy:

• Standard setting: 250W / 25km/h (15.5mph) — the UK legal assistance limit for road use
• Unlocked setting: 500W / up to 40km/h (25mph) — private land only

How far will it go on a charge?

This is the XT90's strongest feature. The 48V 20Ah battery gives an estimated 45–60km (28–37 miles) on throttle alone, or 60–100km (37–62 miles) with pedal assist — roughly double what the smaller-battery bikes in the range manage.

Hills, cold weather, tyre pressure, rider weight and how hard you ride all reduce range, so plan against the lower figure. A full charge takes around 6–7 hours.

How long will the battery last?

Expect several hundred full charge cycles — typically around 500–800 for a lithium-ion pack — before capacity noticeably drops, which is several years for most riders. Charge indoors where possible and avoid leaving it flat, or sitting at 100%, for weeks at a time.

Road use and the 500W setting

In its 250W / 25km/h configuration, the XT90 matches the UK EAPC specification for riding on public roads and cycle paths without registration, tax, insurance or a licence. You must be 14 or over and the bike must have working pedals.

The 500W / 40km/h unlocked configuration is not road legal and should only be used on private land with the landowner's permission.

Check the current GOV.UK EAPC rules before riding on public roads, and see our guide on whether a higher-wattage e-bike is legal if limited to 250W.

Specifications

Range and speed figures are supplier estimates rather than guarantees.

Delivery and returns

• Free UK mainland delivery from UK stock — typically 3–5 working days.
• 12-month warranty.
• 14-day right to cancel under the Consumer Contracts Regulations 2013, plus your full rights under the Consumer Rights Act 2015.
• Sold by Horizon and Co Solutions Ltd, a UK registered company (No. 16942003, England and Wales).

Read more before you buy

Read our full Aairsk XT90 review, see the best budget electric mountain bikes for 2026, use the e-bike battery range calculator, or browse the full electric bike range.