< Go to Best Wallet-Friendly Trail Bikes 2017

Hands-on Gear Review

Trek Fuel EX 7 29 2017 Review

Price:   $2,600 List
Pros:  Versatile, dropper post
Cons:  Under-treaded tires, tall feeling bike
Bottom line:  A more traditional feeling 29er, the Fuel EX can take on a lot of trails, but it isn't the most fun or confident ride.
Editors' Rating:     
  • 1
  • 2
  • 3
  • 4
  • 5
Manufacturer:   Trek

Our Verdict

The Fuel EX rolls quickly and exudes rider confidence, proving that Trek knows how to make a balanced bike with tried and true 29er trail manners. Its speed is not disturbed by root and rock strewn trails. When climbing and pedaling, the Fuel EX sets riders up high in a strong position to keep their well-earned momentum, but that tall feel combined with a rigid seatpost limits body positioning on steeper descents and in corners. Trek unleashes the Fuel EX 7 with a respectable build kit, including a KS Lev internal dropper post, Rock Shox Revelation fork, and Fox Float Performance EVOL shock. The Shimano/SLX 2x10 drivetrain on a 2017 model bike is surprising, but we concede that it provides an excellent granny gear for a bike that designed with climbing in mind.

Best Application — We find the Trek Fuel EX to be a great option for riders seeking the safety net of stability provided by a little extra travel and true 29er characteristics, but who don't want to stray far from cross-country oriented terrain. This bike handles a wide variety of trails but is a little too sluggish in the corners to confidently tackle steeper and tighter turns. Those seeking a more aggressive downhill feel might consider trying the well-rounded Santa Cruz Tallboy or the Giant Anthem for its nimble attitude.


RELATED REVIEW: Best Wallet-Friendly Short-Travel Mountain Bikes of 2017


Our Analysis and Hands-on Test Results

Review by:
Pat Donahue
Senior Review Editor
OutdoorGearLab

Last Updated:
Thursday
May 25, 2017

Share:

Analysis and Test Results


Four of our bike testers put five short-travel trail bikes to the test to find out which performs the best. The Trek Fuel EX 7 29 went head to head with the Santa Cruz Tallboy D 29, Niner Jet 9, Specialized Camber Comp 29 and Giant Anthem 2. By ranking the bikes in fun factor, climbing, descending and build we get comparative scores. The Fuel EX earns a 68 out of 100. Our rigorous testing process and procedures are outlined in our How We Tested article.

The Fuel sports Trek's Active Braking Pivot (ABP) suspension and mid-length chainstays.
The Fuel sports Trek's Active Braking Pivot (ABP) suspension and mid-length chainstays.

Frame Design and Suspension Overview


The Trek Fuel EX utilizes Trek's Active Braking Pivot (ABP) suspension design. ABP suspension features a pivot point at the rear axle, which allows the suspension to move freely regardless of braking forces. The shock is mounted to the rocker link and is completely independent of the front triangle. This system is not known to be the most progressive, meaning it reacts similarly to small bumps and bigger, harder hits. More progressive air shocks, which ramp up as they move through their stroke, help combat this shortcoming.

The Trek Fuel sports 130mm of rear wheel travel, making it the longest travel bike in our test. Trek built the Fuel EX with adjustable geometry to allow for 27.5+ wheels. Since we tested this bike as a 29er, we will focus on the Low/29 setting. The head angle measured to 67.2 degrees and we measured the chainstays at 435mm, which is right in line with the rear ends of the other 29ers in our test class. Check out How We Test for our measuring methods.

130mm of front and rear suspension allows riders to get a little wild.
130mm of front and rear suspension allows riders to get a little wild.

Fun Factor


The Trek Fuel EX is a fun bike for riders who want efficient output for their energy and enjoy holding speed. This bike is all business with its predictable handling attributes and reliable downhill performance. While the Fuel EX may not have an especially large appetite for playing around or boosting trail features, going fast is fun.

We found the Trek Fuel EX to lack quickness and responsiveness. It does not have the same insatiable appetite to be airborne or to ride its back wheel as the Santa Cruz Tallboy or the Giant Anthem. What this bike lacks in spirited and lighthearted attitude, it makes up for in straight line confidence and its ability to hold speed. The Fuel EX is a fast feeling bike that lacks in cornering and flickability, yet maintains a fun feel in its own right. Once testers got a grasp on how the Fuel likes to operate, the fun-factor seemed to improve. Some folks prefer the fun of driving a muscle car to that of a rally car.

The Fuel EX is a comfortable and quick bike. Be careful not to get too wild in the corners.
The Fuel EX is a comfortable and quick bike. Be careful not to get too wild in the corners.

The KS Lev Internal dropper post makes for an aggressive attack position aboard the Fuel EX. Dropping the seat out of the of the way helps you compensate for this bike's lack of quickness. Hopping over logs or rocks is made slightly easier by not needing to divert your attention to dodging a seatpost.

Testers found that cornering confidence is severely limited by the Bontrager XR3 Expert tires. While the 29 x 2.4" size offers plenty of rubber and mass, the shoulder knobs are weak and not well-defined. Testers found the washy tires to limit the fun factor as it discourages riders from aggressively exploring new lines due to the risk of losing traction. In our experience, slapping what Bontrager calls "cross country performance" tires onto a trail bike isn't a recipe for a particularly fun ride.


Our testers scored the Fuel EX a 6 out of 10 for its fun-factor, directly behind the Specialized Camber which scored a 7 out of 10. The lively and quick Giant Anthem posted an 8 out of 10 and the boisterous Santa Cruz Tallboy scored an 9 out of 10.

The Fuel EX requires some commitment and energy to engage in trail shenanigans.
The Fuel EX requires some commitment and energy to engage in trail shenanigans.

Downhill


We find the Trek Fuel EX to be a capable descender that lacks sharp precision. When the rocks and roots get chunky, the Fuel holds its own. The bike's geometry feels composed and stable through the chunder. The 67.2-degree head tube angle seems slack enough that, barring a poor line choice, you won't be ejected over the bars. The short chainstays allow for a nice stiff feel in the rear of the bike and provide stability at speed. Testers praise the KS Lev Integra dropper post, stating that it really opened the door for a more confident descent. Handlebars that measured out to only 750mm felt old-school. Adding a wider bar might add even more confidence and stability.

Our testers find the Fuel EX to be a fast descender. Many 29ers mask speed well, and this bike is no different. In other words, riders may not feel the true amount of speed they are carrying. The ride is smooth and composed. The Fox Float Performance EVOL rear shock is a noble performer when paired with Trek's ABP suspension and provides a damp and predictable ride. The Rock Shox Revelation RL is not a source of contention amongst most testers, who state the fork did a fine job. One tester is not so pleased with the fork. He cited that when stepping off technical sections the fork felt very springy and fast on the rebound, an adjustment he was unable to tune out.

Speed and momentum your best friend aboard the wagon-wheeled Fuel Ex.
Speed and momentum your best friend aboard the wagon-wheeled Fuel Ex.

OutdoorGearLab testers are very split on the downhill handling and confidence provided by the Fuel EX. Half of our testers feel this is a relatively nimble and confident descender. Other testers feel this bike is tall, resulting in the dreaded feeling of being on top of the bike rather than in the bike. The interesting part of this disagreement among testers is that there is no real pattern of rider height or body type that allowed us to draw a reasonable conclusion as to why certain riders felt this way. One consistent black mark on the Fuel EX's downhill handling are the Bontrager XR3 tires. It's difficult to make a commitment to adjust lines or work the slightest bit against the flow of the trail for fear of losing your front wheel. We feel these tires have a poor braking bite and would be a liability riding in wet locations.

We find the 2x10 drivetrain to be a curse and a blessing when descending. On one hand, there is a much stiffer high gear thanks to a 36 tooth big ring. Thanks to this harder gear, you can put more power down on the downhill and go faster if the trail allows. On the other hand, the gearing is closer together on a 2x10 setup, and multiple testers noted that they had to double shift to get the jump in gearing they desired. It can feel like a lot of shifting. We did not find a significant amount of dropped chains in our testing, but we weren't riding excessively rough terrain.


We scored the Trek Fuel EX a 7 out of 10 for its downhill abilities. This places the Fuel in a tie with the Specialized Camber and behind the ninja-like Giant Anthem, which posted an 8 out of 10 for its maneuverability. The Santa Cruz Tallboy won the category with a 9 out of 10 for its stability and responsive handling.

The Trek is an easy-rolling climber with fast rubber and plenty of gears to choose from.
The Trek is an easy-rolling climber with fast rubber and plenty of gears to choose from.

Climbing


The Trek Fuel EX is a capable climber offering low rolling resistance and plenty of gears to choose from. The presence of a true granny gear is a nice luxury to have on steeper or longer climbs. The tradeoff for riding in this easy gear is, while you save a lot of energy, you are typically creeping up the hill and don't have the torque needed to get up and over punchy climbs and trail obstacles. One tester finds himself constantly shifting due to the closer gear ratio of a 2x10 setup. This bike has the longest reach among our test bikes, which makes for a roomy cockpit. This is a nice characteristic for climbing as riders can move around to weight the bike as needed. The cockpit is not too long and did not stretch riders out.

The Trek Fuel Ex clocked the slowest times on our benchmarking climbing course. This chart shows how much faster each bike was than the Fuel EX on average.
The Trek Fuel Ex clocked the slowest times on our benchmarking climbing course. This chart shows how much faster each bike was than the Fuel EX on average.

Our timed testing found the Trek Fuel EX to be the slowest climber out of our five test bikes. The chart above shows how much faster each bike completed the climbing benchmarking time trials than the Fuel EX. That pedal bob and sluggish handling on the switchbacks took a toll. It clocked in behind the speedy Santa Cruz Tallboy and the sharp-handling Giant Anthem.

The climbing motion feels efficient, although testers cite a significant amount of pedal bob when climbing in the Fox Float's Open position. This is especially noticeable when in a standing climbing position. When seated, the Fuel EX feels more like an effective and energy-sipping climber. We measured the Fuel's seat tube angle at 76.5 degrees, which made it one of the steepest in the test. The steep seat tube angle results in an aggressive pedaling position as riders are more on top of the cranks.

Testers utilize the Open-Medium-Firm adjustments often when aboard the Fuel EX. The Firm setting is certainly the most efficient but creates some harsh feedback from the trail surface. We recommend saving the Firm setting for climbing paved roads, dirt roads or smoother double track. The Medium setting appears most effective in eliminating the majority of pedal bob while still maintaining some of its trail-smoothing properties. One tester notes that the lever for this adjustment was difficult to reach as the shock is mounted vertically and tucked low in the front triangle.

As mentioned previously, the Fuel EX carries momentum well. This is no different when climbing. When approaching a steep rocky pitch or navigating a short, punchy and rooty climb, the Fuel EX uses its momentum to conquer. We find that it requires a head of steam, the correct gear, and a little body language and this bike is willing to charge right up most obstacles put in front of it. Weighting the rear tire sufficiently on roots or slick rock is something that requires a fair amount of attention as the Bontrager XR3 tires don't hook up particularly well.

We find that despite sporting the longest wheelbase among test bikes, the Fuel navigates switchbacks well enough and doesn't feel too hard to steer. It's definitely a step behind the most nimble climbers in the test, however, the Santa Cruz Tallboy, Specialized Camber and Giant Anthem. It's a tall task to disrupt the momentum of the 29er. It's also hard to get the momentum rolling. There is a penalty for stalling out on climbs, and it takes a fair amount of work get them moving quickly again, especially when aimed uphill.


We scored the Fuel EX a 7 out of 10 for its climbing ability putting it behind the light-footed Specialized Camber and Santa Cruz Tallboy which posted an 8 and 9 out of 10 respectively. The Trek tied with the Giant Anthem as the third best climber.

The dropper post allows testers to get low  but aggressive cornering is limited by wimpy tires.
The dropper post allows testers to get low, but aggressive cornering is limited by wimpy tires.

Cornering, Handling and Body Language


We found that, while the Trek Fuel EX doesn't change the way we think about 29er handling, it performs dutifully. Cornering is predictable and does require a gameplan when setting up. This is not the kind of bike that can go into a corner crooked and still salvage speed. The rider position feels inherently tall, but the presence of the KS Lev dropper post opened the gate for the Fuel EX to handle well. The ability to get low in the corners on a taller bike is critical.

Our testers describe turn initiation as solid, but it requires a fair amount of body language. We weighed this bike at 31 lbs 12 oz in the 18.5" size we tested. While this is a substantial amount of heft, testers did not report any fatigue from whipping it around. Short chainstays make it easy to lift the front end skyward for manuals or wheelies. However, the heavy front end discourages such behavior.

We don't want to beat a dead horse, but the Bontrager XR3 tires are a serious strike against the Fuel EX. We find that the tires offer limited corner control. The round design of the "shoulder" knobs didn't clearly define the breakaway of the tires. Testers have to be careful to not lay the bike over past the washout zone as the tire doesn't provide proper warning. The narrower bars mounted to the Fuel didn't jump out at our testers as a serious issue. That being said, cornering abilities would only improve with a wider bar.


Build


The Trek Fuel EX 7 provides exceptional performance and comes outfitted with exceptional build specifications.

 

Fork and Shock -- The EX 7 comes outfitted with a RockShox Revelation RL 130mm travel fork. The 32mm stanchions are on the thin side for trail bikes where 34mm or 35mm stanchions are commonplace. That being said, testers don't report a flimsy front end. The fork is reliable and comfortable. One tester had trouble dialing in the rebound control, noting it had the "pogo stick" effect when stepping off rocks front-end first, even after trying multiple rebound settings.

The Fox Float Performance Evol rear shock is a rock solid performer. All testers state that they use the Open-Medium-Firm lever extensively and are complimentary of its usefulness.

Wheels and Tires -- The Fuel EX 7 rolls a Bontrager Duster Elite wheelset. These rims don't jump out in a positive or negative light. The hub engagement is solid with no noticeable dead spot.

The Bontrager XR3 Expert 2.4" tire has a nice footprint. The tread pattern, on the other hand, is decisively cross country oriented. The tread is not aggressive, and the shoulder knobs are rounded. In wet climates, we feel these tires would make for a difficult riding experience.

Bontrager XR3 tires mounted front and rear discourage rowdy behavior.
Bontrager XR3 tires mounted front and rear discourage rowdy behavior.

Groupset -- The EX 7 sports a Shimano 2x10 drivetrain with a Deore front derailleur and an SLX rear derailleur. The decision to have a front derailleur on this bike is discussed in detail in the body of this review. Regardless of your feeling on the matter, the 2x10 system worked well with crisp shifting and no dropped chains.

Shimano M506 brakes provide solid stopping power in the wet to dry, hardpack to sandy conditions during out test. These brakes do not have especially impressive modulation, giving riders the on or off feel.

The KS Lev Integra dropper post performed very well during testing while the presence of a front derailleur creates a crowded handlebar.
The KS Lev Integra dropper post performed very well during testing while the presence of a front derailleur creates a crowded handlebar.

Handlebars, Seat and Seatpost — Trek set the Fuel EX 7 up with a KS Lev Integra dropper post. The Lev is a rock solid cable-actuated performer that really sets this bike apart. The post functions flawlessly and allows for more aggressive riding.

Bontrager aluminum bars are installed on the front of the Fuel EX. The 750mm width is slightly narrower than is typical in this day and age. However, testers do not find this to be a major issue.

Trek's Knock Block system prevents the handlebars from spinning too far in the event of a crash.
Trek's Knock Block system prevents the handlebars from spinning too far in the event of a crash.

The Bontrager Evoke 8 saddle does its job and doesn't cause any testers a significant amount of pain.


We scored the Fuel EX an 8 out of 10 for its impressive build kit. This score ranks the Fuel EX only behind the extraordinarily well-equipped Giant Anthem.

Notables — We appreciate the water bottle cage option inside the front triangle.

Build Options


We tested the Trek Fuel EX 7 29 which carries a $2599.99 price tag.

The Trek Fuel EX 5 29 retails for $2,199 with a RockShox Sektor Silver RL fork and a Rock Shox Deluxe RL shock. Shifting duties are performed by a Shimano Deore 2x10 drivetrain, and the brakes are Shimano M315. The EX 5 build would be fantastic for someone who enjoys a mellower, less aggressive ride and doesn't mind a rigid seat post and downgraded brakes.

The Trek Fuel EX 8 is a step-up from our test model and retails for $3,199. This build kit comes outfitted with a Fox Float 34 Rhythm fork and a trek-tuned Fox Float Performance EVOL shock. The drivetrain is a crisp Shimano XT 2x10 setup and stopping power is provided by Shimano Deore brakes. This model is outfitted with the same internally routed KS Lev dropper post as our test model.

The EX 8 build would be a great option for someone who puts value in a slightly crisper shifting feel and a plusher fork.

A 2x10 drivetrain offers a large gear range but does require more frequent shifting.
A 2x10 drivetrain offers a large gear range but does require more frequent shifting.

Value


Trek has a reputation for producing performance bikes at a middle-of-the-road price point, the Fuel EX 7 falls right in line. Our testers are not blown out of the water by its performance, and some raised an eye to the presence of a 2x10 drivetrain on a 2017 model full-suspension bike. That being said, an SLX drivetrain and an internally routed dropper post are reasonable specifications for a bike with a $2,599.99 price tag.

Suggested Upgrades


Immediately slapping some more aggressive tires on this bike would go a long way to improving its performance.

Those looking for a relaxed  traditional 29er experience will love the Fuel Ex.
Those looking for a relaxed, traditional 29er experience will love the Fuel Ex.

Conclusion


The Trek Fuel EX 7 is a 130mm trail bike that is true to its 29er roots. This bike holds speed, is confident when faced with rocks and roots, and can climb efficiently and painlessly. The Fuel EX is a quick descender but may not be as suitable for gnarly and steep terrain as other bikes in this test class. The performance quality paired with the impressive specifications make this a great option for the rider who wants a true 29er and doesn't feel the need to get too aggressive.
Pat Donahue, Joshua Hutchens, Kurt Gensheimer, Kate Blake, Clark Tate

  • Share this article:
You Might Also Like

OutdoorGearLab Member Reviews


Most recent review: May 25, 2017
Summary of All Ratings

OutdoorGearLab Editors' Rating:   
  • 1
  • 2
  • 3
  • 4
  • 5
 (3.0)
Average Customer Rating:     (0.0)
Rating Distribution
1 Total Ratings
5 star: 0%  (0)
4 star: 0%  (0)
3 star: 100%  (1)
2 star: 0%  (0)
1 star: 0%  (0)


Have you used the Trek Fuel EX 7 29 2017?
Don't hold back. Share your viewpoint by posting a review with your thoughts...

Write a Review on this Gear
 

Follow Us


Unbiased.