Trek Fuel MX 9.9 X0 AXS Gen 7
Trek / Trail Mountain Bikes
One bike for every kind of trail.
Fuel MX 9.9 X0 AXS is our top-tier chaos-craving carbon trail bike, built for chasing the wilder things in life. It starts off with an OCLV Mountain Carbon frame, spec’d with a RockShox ZEB Ultimate fork and Vivid Ultimate shock (150mm rear, 170mm front), and MX wheels for getting wild on the trail. SRAM’s wireless X0 AXS transmission delivers crystal-clear shifting, even under load, while 4-piston SRAM Maven Silver brakes give you the modulation and power you need. It’s topped off with a Fox Transfer NEO dropper post and carbon Bontrager Line Pro 30 wheels.
Based on the bike's size chart. Your complimentary baseline fit in store dials in the rest.
Not currently available from Trek
Questions are welcome. No pressure, no bike jargon required.
The ride, not just the specs
Fuel is the all-around trail bike: smooth on the climbs, playful on the way down, and happy on just about any trail you point it at.
If you want one mountain bike that can do a bit of everything, start here.
What makes it special
Only you can define your perfect trail bike — that's why Fuel is available in three adjustability-packed configurations. Get do-it-all capability with EX, go pop-happy with MX, or charge through it all with LX.
Want more bottom-out resistance without giving up small-bump sensitivity? Flip the chip in the lower shock mount for a more progressive leverage rate.
With a ZS standard headset, you've got tons of options for aftermarket upgrades, including angle adjust or anodized colors.
For the detail-oriented
Tap any group to see every part.
Measurements in cm unless noted.
| Size | S | M | L | XL | XXL |
|---|---|---|---|---|---|
| Rider height | 5'1"–5'5" | 5'5"–5'10" | 5'10"–6'2" | 6'2"–6'5" | |
| Seat tube (A on the drawing) | 37.0 | 40.0 | 42.0 | 45.5 | 47.5 |
| Seat tube angle (B on the drawing) | 72.3° | 72.3° | 72.3° | 72.3° | 72.3° |
| Head tube length (C on the drawing) | 9.5 | 11.0 | 12.5 | 14.0 | 15.5 |
| Head tube angle (D on the drawing) | 64.2° | 64.2° | 64.2° | 64.2° | 64.2° |
| Eff. top tube (E on the drawing) | 54.9 | 58.4 | 61.8 | 65.2 | 68.2 |
| BB height (F on the drawing) | 34.3 | 34.3 | 34.3 | 34.3 | 34.3 |
| BB drop (G on the drawing) | 3.1 | 3.1 | 3.1 | 3.1 | 3.1 |
| Chainstay length (H on the drawing) | 43.4 | 43.4 | 43.9 | 44.4 | 44.9 |
| Offset (I on the drawing) | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 |
| Trail (J on the drawing) | 13.2 | 13.2 | 13.2 | 13.2 | 13.2 |
| Wheelbase (K on the drawing) | 119.1 | 122.8 | 126.4 | 130.1 | 133.2 |
| Standover (L on the drawing) | 74.5 | 74.7 | 75.4 | 76.0 | 76.9 |
| Reach (M on the drawing) | 42.6 | 45.6 | 48.2 | 50.7 | 52.7 |
| Stack (N on the drawing) | 61.3 | 62.7 | 64.1 | 65.4 | 66.8 |
| Frame size | 15.5" | 17.5" | 19.5" | 21.5" | 23" |
| Wheel size | 29"/27.5" | 29"/27.5" | 29"/27.5" | 29"/27.5" | 29"/27.5" |
| Eff. seat tube angle | 78.3° | 77.5° | 77.0° | 76.6° | 76.1° |
| Front Center | 75.8 | 79.5 | 82.6 | 85.7 | 88.4 |
The Atlanta Cycling difference
Specs matter. But so does how a bike feels when you ride it. Our team is here to help you choose the right size, understand the details, and get comfortable before your first ride.
When you buy from Atlanta Cycling, you're not just getting a box with a bicycle in it. You're getting a 30-day money-back guarantee, a complimentary baseline fit, lifetime basic adjustments, and real people who want you to love every mile.
“Supreme versatility.”
There are so many good bikes on the market right now, and the Fuel stands out thanks to how effortlessly it shapeshifts and how straightforward and easy to love it is in each of its configurations.
freehub.com · Read the review
“Design & Innovation Award 2026”
For tech-savvy trail riders, ambitious enduro racers, and tinkerers seeking a tuneable platform, Fuel LX delivers an intuitive, confidence-boosting ride that urges you to push harder
design-innovation-award.com · Read the review
“An especially adaptable one-bike quiver”
Fuel EX stands out for being one of the most versatile all-rounder trail bikes on the market - especially ones you factor in the modularity of the new platform and the ability to convert it to a Fuel MX or LX, too.
blisterreview.com · Read the review
Four neighborhood stores. One shared passion.
Ansley. Alpharetta. Roswell. Vinings. Stop by, take a test ride, ask questions, and meet the people who will be here long after your first ride.
