Mountain bikes under £800: where the money should go
Under £800 is where most people buy their first mountain bike, and it is a price band full of traps. The biggest one is full suspension: a bike with a rear shock at £700 has spent a third of its budget on suspension that will not work properly, and the rest of the bike is built down to a price to compensate.
The alternative is a rigid or hardtail bike at the same money with decent brakes, a sensible drivetrain and less weight. That is almost always the better purchase for a first mountain bike, and this guide explains why, and what to prioritise instead.
The full suspension trap
A rear shock needs three things to work: damping, a spring rate matched to the rider, and servicing. At £700 for the whole bike, there is no budget for any of them. What you get is a heavy coil or cheap air unit that pogo-sticks on descents, bobs under pedalling, and cannot be adjusted to suit you.
The consequences go beyond comfort:
- Weight. Cheap full suspension adds 3-5 kg compared to a hardtail at the same price.
- Flex. Cheap pivots and linkages flex under load, which makes the bike feel vague and wears the bearings.
- Maintenance. The shock and pivots need servicing, and at this price nobody does it, so the suspension degrades into a liability.
- Component compromise. Every pound spent on the shock is a pound not spent on brakes, wheels or drivetrain.
A hardtail at £700 has all £700 in the frame, fork, brakes and wheels. It will climb better, be more reliable, and be easier to maintain. The only thing it will not do is absorb a big hit at speed, which is not what a first mountain bike is for.
The specification order
1. Brakes
Off-road, brakes are the safety component. Hydraulic disc brakes are markedly better than mechanical: more power for less lever effort, and they self-adjust as pads wear. If you can get hydraulic brakes at this price, prioritise them over almost anything else.
Mechanical disc brakes are acceptable and can be upgraded later. Rim brakes on a mountain bike are not acceptable — they lose performance completely in mud.
2. Fork
A suspension fork at this price is a basic coil or air unit with limited adjustment. What matters is that it has enough travel (100-120mm for cross-country) and that it does not flex alarmingly under braking.
A rigid fork is not a downgrade at this price: it is lighter, needs no maintenance, and transmits less vagueness to the steering. If your riding is towpaths, forestry roads and gentle trails, rigid is a reasonable choice.
3. Wheels and tyres
Wheel size: 27.5 or 29-inch are the modern standards and roll over obstacles better than 26-inch. 26-inch is still common at this price and is not a problem, but tyres and rims for it are becoming less available.
Tyre width: 2.1-2.4 inches is the trail standard. Wider is for rougher ground; narrower rolls faster.
Check the rims are tubeless-ready if you can. Converting to tubeless eliminates most pinch punctures, which is the single best upgrade for off-road riding.
4. Drivetrain
At this price you will see 21, 24 or 27-speed setups, usually Shimano Tourney or Altus level. They work. What matters is the lowest gear: on a steep climb with a heavy bike, a gear that is not low enough means walking.
A 1x setup (single chainring at the front) is simpler and less to go wrong, but at this price it usually comes with a narrower gear range.
5. Frame material
Aluminium is the standard at this price and is fine. Steel is heavier but more forgiving and repairable. Carbon at this price is a red flag: either it is not real carbon, or the rest of the bike is built down to nothing.
6. Weight
A heavy mountain bike is tiring to climb with and awkward to handle. Under £800, 13-15 kg is reasonable for a hardtail; anything over 16 kg is heavy, and over 18 kg means something has gone wrong.
What to skip
Full suspension. Covered above.
Very wide tyres on a hardtail. A 4-inch fat tyre on a rigid frame is a fat bike, which is a different tool for a different surface. On a mountain bike, 2.1-2.4 is right.
Disc brakes on one wheel only. If a bike has a front disc and a rear rim brake, it is a cost-cutting compromise.
Anything with a brand you cannot look up. At this price, there is no margin for a warranty that does not exist.
Buying new versus used
At £800, the used market is genuinely interesting. A three-year-old hardtail that cost £1,200 new is a better bike than a new £800 one: better fork, better brakes, lighter frame. The risks are worn drivetrains and hidden frame damage.
What to check on a used mountain bike:
- Frame: cracks near welds, especially where the top tube meets the head tube and seat tube. Look under the bottom bracket for impact damage.
- Fork: stanchion scratches (they destroy the seals), and whether it compresses smoothly.
- Wheels: spin them and watch the rim against the brake pads; a wobbly rim is cheap to fix, a cracked one is not.
- Drivetrain: a worn chain and hooked chainring teeth mean £60-100 of parts.
- Brakes: pads, and whether the lever feels firm.
A used bike with a service history and a straight frame is the best value in this price band.
The honest summary
At £800, buy a hardtail with hydraulic brakes, a sensible fork and a frame that fits you. Spend the money on brakes and wheels rather than suspension. Skip full suspension entirely.
If your riding is mostly gentle tracks and paths, a rigid bike at £500 does the job and leaves money for a helmet, a pump and a lock — all of which you need more than a rear shock.
For sizing, our <a href="/guides/bike-size-guide-frame-wheel-height/">frame and wheel size guide</a> explains why mountain bike frames are quoted in inches and how to choose between 27.5 and 29-inch wheels.