Best Mountain Bikes Under £750 UK

Based on current Cyclesite listings, standout options include the 2024 Trek Marlin 5 Gen 2 at £300 in excellent condition and the 2026 Trek Procaliber 6 at £650 — both representing strong value for the money. The GT Avalanche 27.5 at £265 in excellent condition is another solid pick, particularly for riders who want a capable trail bike without spending near the top of the budget. Trek and Whyte consistently offer the best build quality in this segment.

Yes — £300 sits right at the median price for mountain bikes currently listed on Cyclesite in this segment, which means half the market is at or below that figure. At £300 you can find bikes like the 2024 Trek Marlin 5 Gen 2 in excellent condition, which is a genuinely capable hardtail. The key is prioritising condition and age over brand name alone — a newer bike from a mid-tier brand will typically outperform an older bike from a premium brand at the same price.

On Cyclesite, mountain bikes in this price band average 44 days on the market, based on current data. Three bikes have sold in this segment in the last 90 days. Bikes priced at or below the £300 median in excellent condition tend to move faster. If you're selling, competitive pricing and clear photos of the drivetrain and suspension make the biggest difference to time-on-market.

Carrera bikes represent the most affordable entry point in this segment — three are currently listed on Cyclesite with an average asking price of £212. They're Halfords own-brand bikes built to a price, which means components are serviceable rather than exceptional. For casual trail riding, light off-road use, or a first mountain bike, a used Carrera in good condition at around £200 is a reasonable choice. For more demanding riding, budget towards Trek or Whyte.

Focus on five areas: frame condition (look for cracks around the welds, not just scratches), suspension travel and smoothness (bounce the fork and check for oil leaks), drivetrain wear (a worn chain usually means the cassette needs replacing too), brake performance (squeeze both levers hard and check for fade or sponginess), and wheel trueness (spin each wheel and watch for wobble). Budget £50–£100 for a post-purchase service regardless of how good the bike looks.

At £250 — around the Carrera and GT Avalanche price point — you're getting a functional hardtail with basic components, likely an older model year. At £600, closer to the Trek Procaliber 6 currently listed at £650, you're looking at a near-new bike with updated geometry, better brakes, and components that will last longer before needing replacement. The jump in ride quality is meaningful, particularly on technical terrain. If budget allows, spending closer to £500–£650 buys significantly more bike.

A 2018 bike in excellent condition — like the GT Avalanche 27.5 currently listed at £265 — can still be a strong buy, provided it's been maintained and uses components that are still widely available. Seven-year-old bikes may use older standards (thru-axles, boost spacing, and dropper post routing have all evolved), which can limit upgrade options. Check that brake pads, cables, and tyres are fresh, and factor in a service. For recreational riding, a well-kept 2018 bike is perfectly capable.

In the current Cyclesite data, Trek commands the highest average resale price at £475 across two listings, reflecting strong brand recognition and newer model years. Whyte, at £526 for its single listing, also holds value well due to its trail-focused reputation. Carrera depreciates more steeply — three listings average just £212 — which is actually useful for buyers looking for the lowest entry point. Specialized and GT sit in the middle of the range at £300 and £265 respectively.