An electric mountain bike is a different buy from a commuter e-bike. You are paying for suspension, grippier tyres, lower gearing and a frame built to take a beating, and those choices matter more than headline motor numbers.
This guide covers four e-MTBs currently available in the UK, compared on the things that actually separate them.
Start with the law, because it narrows the field
A UK electrically assisted pedal cycle must have a motor rated at 250W continuous with assistance cutting out at 15.5mph. Ride something more powerful on a road, cycle path or shared-use path and it is legally a motorcycle: registered, taxed, insured, licensed, and helmeted accordingly.
This bites harder on mountain bikes than on any other category, because "high power" is sold as a feature. Plenty of 750W and 1000W machines are listed as mountain bikes on UK marketplaces. They are fine on private land with permission and illegal almost everywhere else.
Every bike below is either confirmed 250W or sold as UK-legal. For the full rules, see our UK e-bike law guide.
The four bikes
DUOTTS C29 — the long-range one
29-inch wheels, a 48V 15Ah removable battery and a 250W motor. The battery is the largest here by some distance, quoted at 80–100km with pedal assist and 50–60km on electric alone. A 21-speed Shimano setup and front suspension fork, with disc brakes front and rear.
Bigger wheels roll over rough ground more easily than 26-inch, which suits trails and towpaths. The trade-off is weight, and it is the most expensive of the four at £699.
GSOU 26″ — the one that states its legality
Explicitly sold as UK-legal with a 250W brushless motor and a 25km/h limit. A 36V 8Ah removable battery quoted at 40+ miles, 7-speed Shimano gearing, dual disc brakes and a lockable front suspension fork.
That lockout is the detail worth noticing: suspension helps on trails and wastes your effort on tarmac, so being able to switch it off makes a genuine difference if you mix the two. At £429.99 it is the cheapest here.
Finbike 26″ — the middle ground
A 26-inch e-MTB with a removable battery quoted at 60–80km, five assist levels and 7-speed derailleur gearing, with an LCD display. Priced at £467.49.
The spec sheet is thinner than the others — weight and charging time are not published — so it is the one to research hardest before committing.
Touroll U1 — the one with a track record
Available in both 26-inch and 29-inch, with a 36V 13Ah removable battery, 21-speed transmission and dual disc brakes. At £449 it sits just above the GSOU.
It is also the only bike here with meaningful review history behind it: 4.5 stars from 177 ratings. On a category where most listings have a handful of reviews, that counts for something.
What actually matters when choosing
Battery capacity, not range claims. Quoted ranges assume flat ground, low assist and a light rider. Compare the amp-hours instead: 15Ah (DUOTTS) against 8Ah (GSOU) is a real difference, and hills eat range fast.
Removable batteries. All four have one. If you have no garage, this is not optional — you will be carrying the battery indoors to charge rather than the whole bike.
Suspension type. All four are hardtails, meaning front suspension only. Full-suspension e-MTBs exist but start well above this price bracket. For towpaths, forest tracks and rough roads a hardtail is enough.
Gears still matter. The motor cuts out at 15.5mph, so above that you are pedalling an unusually heavy bicycle. Higher gears are what make that bearable.
Weight. These bikes are 25–30kg. Consider stairs, car boots and bike racks before buying.
Which one
For most riders the GSOU makes the most sense: cheapest, explicitly UK-legal, and the lockable suspension makes it competent on both trails and tarmac. Choose the DUOTTS C29 if range is the priority and the extra £270 is worth it, or the Touroll U1 if you would rather buy something with a proven review record behind it.
