Trek Fuel EX 9.9 29 Trail Bike Review

By Max ShumpertUpdated:25th July 2020Max ShumpertClaire Offley

Reviewed by Claire Offley

Trek Fuel EX 9.9 Review


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Handling, brakes, warranty, options




The Trek Fuel EX 9.9 is a top-of-the-line mountain bike designed for pros and avid enthusiasts, but it’s just as good as a starting bike for novice cyclists.

Our Rating




The Trek Fuel EX 9.9 29 boasts a rugged yet lightweight design that offers a smooth ride for all cyclists.

The 130mm frame is made of OCLV Mountain Carbon Fiber, which is produced using Trek’s patented process. It can withstand heavy wear and tear and will last for years with proper maintenance.

The 9.9 model’s Straight Shot frame design features Knock Block defense, creating a more compliant frame that’s easy to handle and impressively responsive.

Trek’s Fuel EX 9.9 model can fit a wide range of riders, seating cyclists ranging from 4’10.3” to 6’7.5”.

The frame is also compatible with both 29˝ and 27.5+ wheels to support riders of all weight classes, while boost 148/110 hub spacing creates a more stable base.

Bontrager Line Pro 30 wheels made of OCLV Carbon are robust, resisting dings and dents that might affect performance. The Fuel EX 9.9 also comes with high-end Bontrager XR4 Team Issue mountain bike tires that boast deep traction that can grip everything from mud to gravel.

The 9.9 model is the very top of the Fuel EX line, offering unparalleled speed and maneuverability.

It’s more technically advanced than other Fuel EX models, with a Re:aktiv shock system that utilizes Trek’s revolutionary Thru Shaft design to respond quickly and seamlessly to changes in terrain.

Trek Fuel EX 9.9 Trail Bike ReviewTrek Fuel EX 9.9 Trail Bike Review

A rear shock setup in Full Floater also helps to provide a smoother ride and alleviate discomfort on unforgiving terrain.

The unique Full Floater design allows for extremely responsive rear suspension action that nearly eliminates shock on rough or rocky trails.

Riders will find braking easier with the Fuel EX 9.9 thanks to Trek’s Active Braking Pivot technology. This patented read suspension system works to keep cyclists grounded and in control of their bike, even at high speeds. It also prevents brakes from locking up to give users a safer and more stress-free ride.

 Trek Fuel EX 9.9 Tech Specs

FRAME SIZE: Line Pro OCLV carbon 130mm main frameBRAKE TYPE: SRAM guide ultimate carbon hydraulic diskSHIFTER: SRAM x01 eagle, 12 speedRIMS: Bontrager line pro OCLV 30 CarbonTIRES: Bontrager xr4 team issue

Trek Fuel EX 9.9 – What Do We Like?

The Trek Fuel EX 9.9 is not only a top-of-the-line piece of equipment, but it also turns heads on the trail.

The sleek, streamlined design is highlighted by customizable colors that can add a bit of a personal touch to your bike. The Fuel EX 9.9 comes in several different color schemes, including:

  • Trek Black/Green Light
  • Matte Trek Black/Gloss Solid Charcoal
  • Radioactive Orange/Trek Black
  • Radioactive Purple/Radioactive Yellow-Orange Fade

While we undoubtedly love the look of the Fuel EX 9.9, we think that the handling is an even better feature. Advanced Trek technology is incorporated into every aspect of the bike to make it safer and easier to navigate your way through difficult trails.

Bikes in Trek’s Fuel EX line are designed using state-of-the-art engineering, including a Straight Shot frame design and Knock Block frame defense.

The resulting trek fuel ex 9.9 frame boasts an optimal stiffness-to-weight ratio, making it less rigid and more compliant without sacrificing speed.

Trek Fuel EX 99

Trek’s unique RE:aktiv with thru shaft suspension system has helped to revolutionize the way that the Fuel EX line handles by using a regressive damping system similar to that found in Formula 1 race cars.

The 9.9 model takes things even further by using a thru-shaft design to respond to changes in terrain even more quickly, giving you an unprecedented level of control over your bike.

We also like that the Fuel EX was built with safety in mind.

The bike includes a responsive braking system that helps to reduce the risk of your brakes locking, which can result in serious injuries. Trek’s patented Active Braking Pivot gives you a smooth and controlled suspension that keeps you in control of your bike at all time.

If you ever find that your bike is in need of repair, all Trek bikes come with a lifetime warranty. Once you’ve registered, you can receive free care from Trek professionals if your bike is ever damaged.

Read Also: Trek 520 Review 2022


  • Color options
  • Easy handling
  • Efficient braking
  • Fast
  • Safe
  • Lifetime warranty

Trek Fuel EX 9.9 Tech Specs – What Don’t We Like?

For most, the main drawback to the Fuel EX 9.9 is its price.

The model is much more expensive than its counterparts, costing upwards of $7000. Similar models, such as the Fuel EX 5, which runs closer to $2000.

The main reason for the price increase is that the Fuel EX 9.9, unlike other models in this line, had both a frame and wheels made of robust OCLV Mountain Carbon.

Carbon fiber is typically more expensive than other popular materials such as aluminum, but also offers a superior performance without adding weight.

While the Trek Fuel EX 9.9 carbon may be expensive, for the avid cyclist, the price is well worth it. The bike can withstand years of heavy use while still handling like new. Even if the carbon fiber assembly does take on damage, you can rest easy knowing that it’s covered under warranty.


  • Expensive

Trek Fuel EX 9.9 – Advice for Buyers

The Trek Fuel EX 9.9 is a top-of-the-line mountain bike designed for pros and avid enthusiasts, but it’s just as good as a starting bike for novice cyclists.

It rides well over a range of terrains and is durable enough to withstand accidental wear-and-tear. What’s more, you can take advantage of the bike’s lifetime warranty and get advice and assistance from Trek cycling experts at any time.

This bike model’s seat and frame design are not necessarily optimized for women, and so it’s a good idea for female cyclists to schedule a skilled sizing at an authorized Trek dealer to find out if the Fuel EX 9.9 offers a comfortable fit.

Related Trek Mountain Bikes

Our Conclusion

Whether you’re looking for a robust trail bike or a top-quality XC bike, you can find the best of both worlds in the Trek Fuel EX 9.9.

Visit your nearest retailer for trek fuel ex 9.9 for sale or hop online to purchase a Fuel EX 9.9 and enjoy smoother, faster, and safer rides. you can also read review of other trek bike reviews like Trek fx 1 review.

Trek Fuel EX 99

Trek Fuel EX 9.9 29

What makes it great?

  • Best in class suspension
  • Extremely Durable
  • Lifetime warranty with Trek

93/100our score

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