More travel, more progression, more geometry adjustment, more sizes - the Trek Fuel EX gets the Oliver Twist makeover.


Trek has launched a brand new version of the Fuel EX trail bike, and with it a ton of new features and updates to address pretty much any quibble you had with the old bike. We’re talking about: a chip to let you tune the progression of the shock; head angle adjustment to complement the existing Mino Link; size specific chainstays; downtube storage across the whole range; more travel; and loads more.

It was a great bike before, a biketest winner in fact and one of the best full suspension mountain bikes we’d ever ridden. The new bike promises to take that a stage further.

Trek Fuel EX

The Fuel EX has gained 10mm in travel, and it’s longer, lower and slacker than the old bike… and starting to tread on the toes of the 160mm Remedy

Need to know

  • Head angle goes as slack as 63.5° thanks to new headset cups that complement the Minnow Link chips
  • Longer, lower and slacker geometry, with a steeper seat tube angle for better pedalling
  • Travel is up by 10mm from the old bike, to 140mm front, 150mm rear
  • Eight sizes, 29in wheels predominate, with 27.5in on the smallest sizes
  • New progression chip lets you tweak the shock position and add more platform
  • Fuel EX can take almost any shock on the market, Trek says, coil and air
  • Six models in the range, alloy and carbon: from £3,300 for the Fuel EX 7 to £11,750 for the 9.9 XX1 AXS
Trek Fuel EX Trek Fuel EXe

Trek Fuel EX and Trek Fuel EXe… spot the difference!

First though, how similar does the new Fuel EX look to the also-new Trek Fuel EXe e-bike? They even sport the same travel. This is deliberate; Trek wants you to make a choice between the bikes based on how much help you want, not on how the bikes look, how much travel they bring or the ride feel they deliver.

That means the new Fuel EX looks like an e-bike that in turn looks like a regular bike. Whaaat?!

10mm more travel

So to the new Fuel EX. Trek has boosted the travel by 10mm, taking it to 140mm rear and 150mm front. Because who doesn’t want more travel? Also, Trek’s thinking is that the Fuel EX can be more than just a trail bike if it wants, so there are options to increase the travel further, swap the wheel sizes and even fit a different shock.

Trek Fuel EX

Top spec Fuel EX gets a full XX1 AXS drivetrain as well as a Factory level Fox 36 fork and Float X shock

Longer, lower, slacker, steeper

LLSS is the new LLS. Just like on the old bike, the new Fuel EX comes with Minnow Link, two little flip chips on the rocker link that let you change the BB height and head angle. That means the head angle is down to 64.5° in the slack setting, a full degree slacker than when we tested the old version of the bike.

The BB height is lower too – on paper it’s just 2mm, but with 10mm more travel to contend with this means at sag the bike will hug the ground more closely. The Minnow Link changes that BB too of course, raising or lowering it by 8mm.

Trek Fuel EX

The Minnow Link lets you change the geometry by a degree on the head angle and 8mm on the BB height. The new bike is clocked lower though

All told, the new bike’s high position gives it the same geometry figures the old bike commanded in its low position, with the longer fork slotted into both bikes. This makes the Minnow Link a lot more usable now, you won’t just be slinging it into low position and forgetting about it.

Trek has taken a leaf from the Specialized brochure, and gone with adjustable headset cups, so you can tune the head angle +/- 1°. That’s useful if you want to keep the bottom bracket the same height, and independently change your head angle.

It works like this – the upper cup just drops in, and you turn it 180° to steepen or slacken the angle. The lower cup is more fiddly, it needs to be pressed in but the bike comes with it installed. The cups have notches and laser-engraved guides to help you install them straight.

Trek Fuel EX

29in wheels front and back, unless you’re going for the size XS, which comes 27.5, or the small, which comes with either

What, no mullet?

The Fuel EX remains a 29in wheel bike in most of the eight sizes on offer (XS-XXL). The exceptions are the diddiest XS which is 27.5in and the S which you can get as a 29er or 27.5in. There’s nothing stopping you putting a 27.5in wheel in the back of the Fuel EX though, and Trek actually endorses this, with suggestions on how to set it up. Put it in the high mode, and adjust the air assembly in the fork to give you 160mm travel to keep the BB from getting pedal-bonkingly low, it says.

How big?

Sizing has grown with the new bike, each size is 10-20mm bigger in the reach measurement. Fortunately, to compensate for that longer front end, Trek has built a longer back end too – the chainstays are at last size specific and range from 435mm on the XS bike up to 450mm on the XXL. The seat tube is steeper this time around too, for a better climbing position, so in theory when you’re sat down and pedalling you won’t notice the extra length in the bike because you’ll be shunted forwards.

One final word on geometry, there’s now a chart on the Trek website to let you see how the geometry will change when you tinker with the adjustment hardwear.

Trek Fuel EX

A more or less progressive suspension feel can be had at the flip of an allen key – pop out the little black lozenges either side and shunt the shock back

Trek Fuel EX suspension

Here’s the big change, in my mind. If the old bike had a flaw it was that the suspension didn’t have much of a platform. Instead it was sensitive off the top. On reflection, is that really a flaw in a trail bike? We didn’t think so, but plenty of riders are looking for more progression, so Trek has added some. Or more accurately, the ability to add some, with a progression chip.

The new frame lets you adjust the position of the shock by moving the lower mounting point further aft and increasing the leverage rate, building in more of a platform. And for those who liked the suspension feel just fine before, just leave the chip unchanged.

If looks could thrill

The Fuel EX looks plenty like its predecessor, but there are some subtle changes conjured up by Trek to make room for all the features included, like the progression chip. The shock has shifted further forward, the idea being to give it more space and allow for every shock on the market to fit in there. “If it’s out there it’ll fit on this bike,” Trek says.

Trek Fuel EX

There’s now more space around the shock, which Trek says lets the Fuel EX accept anything out there, coil or air

In practice that means every shock from Fox, RockShox, DVO, Push and MRP can be fitted to the Fuel EX. There are exceptions, largely if you’re trying to fit one of the really big reservoir shocks into a size small frame, Trek seys.

The bike has moved to a 34.9 seatpost now, which is stiffer and more reliable too, particularly at the 200mm length in XXL bikes, while frame storage now comes on the alloy bikes as well as carbon frames. Inside both carbon and alloy bikes is fully guided internal cable routing. Outside is a full length, removable plastic guard on the downtube.

Trek Fuel EX

Double downtube protection is removable

The Trek Fuel EX range

With six models in the range, eight sizes, and two different wheel sizes, the Fuel EX is a distributor’s nightmare… and a rider’s dream.

The entry level Fuel EX 5 isn’t new; it uses last year’s frame, meaning you get 130/140mm travel and entry level components. The 7 is an alloy bike and uses the new chassis and its new downtube storage and retails at £3,300, while the 8 is still alloy but introduces 36mm stanchion forks and the Float X shock for £4,000.

There are three Fuel EX 9 models, and all use a full carbon fibre frame. The 9.7 is the entry level carbon bike and costs £4,800 with a Shimano SLX/XT drivetrain. Step up to 9.8 and you gain XT or GX AXS shifting for £6,850 or £7,450 respectively, while the top end 9.9 features full XTR or XX1 AXS at £9,900 or £11,750.