Trek Fuel+ LX 9.9

Long, steep descents are where the Trek Fuel+ LX 9.9 earns its keep. It is a flagship electric mountain bike for confident riders who want serious suspension and braking control, but prefer a mid-power system to the bulk and dominant shove of a traditional full-power e-MTB. The TQ HPR60 motor supplies 60 Nm of assistance from a removable 580 Wh battery, giving you plenty of scope for substantial days spent earning repeated runs rather than relying on uplift.

Its official UK RRP is £10,475, placing it firmly in flagship territory. That figure buys a very complete standard package: Factory-level Fox suspension, a coil shock, SRAM X0 Eagle AXS Transmission, carbon wheels, strong Maven brakes and a wireless dropper. It makes most sense when you want those parts from day one, rather than paying for a premium build only to replace major pieces soon after.

Compare Trek Fuel+ LX 9.9 prices and retailer offers

The current standard UK bike is the Fuel+ LX 9.9 X0 AXS Gen 2. Project One configurations sit separately because factory-selected parts can differ, particularly around the shock, spring and dropper. Remember to allow for pedals in the purchase budget, as they are sold separately.

What is the latest Trek Fuel+ LX 9.9 generation?

Fuel+ Gen 2 is the current generation, and the LX 9.9 uses Trek's longest-travel LX arrangement. Retail listings may describe this same build as a 2026 or 2027 bike, but those labels do not create separate official generations. The useful identifier is the Fuel+ LX 9.9 X0 AXS Gen 2 name and its component list.

Fuel+ Gen 2 frame, sizing and likely ride character

The OCLV Mountain Carbon chassis runs 29-inch wheels at both ends, with 160 mm of rear travel and a 170 mm Fox Factory 38 fork. Add the Fox DHX2 coil shock, Maxxis Assegai front tyre, Minion DHR II rear tyre and 200 mm rotors, and the brief is clear: this bike is set up for hard, sustained descending on steep natural trails, rough trail-centre runs and enduro-style riding.

A 63.4° to 63.5° head angle, long wheelbases and longer chainstays on the biggest sizes should make the bike feel planted when speeds rise and lines become messy. The trade-off is less zip on slow, mellow routes. Aggressive 2.5-inch tyres and the long-travel chassis favour grip and composure over easy rolling, so they are more than many riders need for smooth, flat loops.

Fit is more considered than simply scaling the frame. The range runs from S to XXL, with size-specific coil springs and dropper travel. Larger sizes receive longer chainstays to help maintain climbing balance, while the S has a slightly curved top tube. The factory coil spring is a starting point, not a personal suspension setting. Spring rate and setup have a big say in whether the DHX2 gives you support through compressions and grip over repeated hits, so it is sensible to include proper setup and, where needed, a different spring in the ownership plan.

The TQ system is intended to keep the ride feeling relatively natural and rider-led. A 10-52-tooth cassette and 32-tooth chainring offer a broad spread for technical climbs, while the 60 Nm motor is there to make another lap tempting rather than turn every ascent into a winch. It will still use more energy than a shorter-travel bike on faster-rolling tyres, but the 580 Wh internal battery is a meaningful advantage for riders who regularly spend full days in the hills.

There is useful adaptability in the Gen 2 frame. An engineered MX conversion is possible, but it is not a rear-wheel-only experiment: it needs a 27.5-inch rear wheel and tyre, MX rocker link, MX lower shock mount and an e-system wheel-diameter update. Retaining the stock 205 mm x 65 mm shock gives 163 mm of rear travel. Compatible angle-adjust headset cups and a choice of suitable Fox or RockShox shocks also leave room to tune the bike's character without replacing the frame.

UK maintenance, battery care and long-term ownership

The claimed weight is 20.31 kg in size M with tubeless sealant and no inner tubes. That is relatively light for an e-MTB with this battery and suspension package, though it remains a sizeable lift for stairs, gates and vehicle loading. The 136 kg combined limit covers bike, rider and cargo, which matters if you ride with a heavy pack or water for a long day.

Charging the 580 Wh battery takes roughly three to four hours. Every size also accepts the optional 160 Wh TQ range extender, creating 740 Wh of combined capacity. It adds 960 g, costs extra and takes bottle-cage space, but it is a sensible option for long winter days or big rides far from a socket. Motor output reduces below 10% charge, so the final stretch home is better treated as a lower-assistance reserve than a fresh boost.

Wet-weather use rewards a simple routine: keep the drivetrain clean, refresh tubeless sealant, and inspect suspension pivots, the dropper and frame protection. The chain can touch the chainstay guard in the 10-tooth sprocket; that guard is a wear item, so inspect it as part of normal maintenance rather than treating the contact as an automatic frame problem. There are also batteries and firmware to manage for the motor system, AXS transmission and wireless dropper, a fair exchange for the clean, high-spec control this build provides.