Trek Top Fuel C Gen 4 Frameset
Trek / Trail Mountain Bikes
Fast on the climbs. Fun on the way down.
Top Fuel C Frameset Gen 4 is a carbon trail frame ready for your dream build. It takes Top Fuel’s do-anything geometry and lets you make it your own — build it light and efficient with a 120 or 130mm fork, or step up to a 140mm setup for more aggressive terrain. Run it as a 29er or mix it up with MX. A 4-position Mino Link lets you fine-tune geometry and suspension to match your ride.
Based on the bike's size chart. Your complimentary baseline fit in store dials in the rest.
Ship to store · free pickup, usually ready in 4–7 business days
Questions are welcome. No pressure, no bike jargon required.
The ride, not just the specs
Top Fuel is for riders who want one bike that goes fast uphill and still lets loose on the descents. It's light and efficient, with enough travel to have fun.
If your rides mix long climbs with good descents, this one is hard to beat.
What makes it special
Opt for light parts and a 120mm fork for a featherweight Top Fuel, or a 140mm fork and longer-stroke 130mm rear shock for extra versatility. Room for a longer dropper and MX wheels lets you customize Top Fuel into an ultimate playful trail whip.
Easily adjust the suspension and geometry four different ways for where and how you ride. With the flip of a chip, you can ride with more or less progressive suspension, and tweak your geometry for a slacker head tube and lower BB or steeper head tube and higher BB.
New internal frame storage bags make it easy to ditch the pack and still carry your ride essentials.
For the detail-oriented
Tap any group to see every part.
Measurements in cm unless noted.
| Size | S | S | M | M | ML | ML | L | L | XL | XL |
|---|---|---|---|---|---|---|---|---|---|---|
| Rider height | 5'1"–5'5" | 5'1"–5'5" | 5'5"–5'10" | 5'5"–5'10" | 5'8"–5'11" | 5'8"–5'11" | 5'10"–6'2" | 5'10"–6'2" | 6'2"–6'5" | 6'2"–6'5" |
| Seat tube (A on the drawing) | 36.0 | 36.0 | 41.0 | 41.0 | 42.0 | 42.0 | 43.5 | 43.5 | 47.0 | 47.0 |
| Seat tube angle (B on the drawing) | 69.0° | 69.0° | 70.0° | 70.0° | 70.0° | 70.0° | 70.0° | 70.0° | 70.0° | 70.0° |
| Head tube length (C on the drawing) | 10.5 | 10.5 | 10.5 | 10.5 | 11.0 | 11.0 | 11.5 | 11.5 | 13.5 | 13.5 |
| Head tube angle (D on the drawing) | 65.5° | 65.5° | 65.5° | 65.5° | 65.5° | 65.5° | 65.5° | 65.5° | 65.5° | 65.5° |
| Eff. top tube (E on the drawing) | 55.9 | 55.9 | 58.8 | 58.8 | 61.2 | 61.2 | 63.1 | 63.1 | 67.3 | 67.3 |
| BB height (F on the drawing) | 34.5 | 34.5 | 34.8 | 34.8 | 34.8 | 34.8 | 34.8 | 34.8 | 34.8 | 34.8 |
| BB drop (G on the drawing) | 1.6 | 1.6 | 3.2 | 3.2 | 3.2 | 3.2 | 3.2 | 3.2 | 3.2 | 3.2 |
| Chainstay length (H on the drawing) | 43.5 | 43.5 | 43.5 | 43.5 | 44.0 | 44.0 | 44.0 | 44.0 | 44.5 | 44.5 |
| Offset (I on the drawing) | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 |
| Trail (J on the drawing) | 11.5 | 11.5 | 12.5 | 12.5 | 12.5 | 12.5 | 12.5 | 12.5 | 12.5 | 12.5 |
| Wheelbase (K on the drawing) | 115.1 | 115.1 | 118.8 | 118.8 | 121.0 | 121.0 | 122.7 | 122.7 | 127.1 | 127.1 |
| Standover (L on the drawing) | 70.0 | 70.0 | 75.0 | 75.0 | 75.2 | 75.2 | 75.3 | 75.3 | 75.8 | 75.8 |
| Reach (M on the drawing) | 41.7 | 41.7 | 44.7 | 44.7 | 46.2 | 46.2 | 47.7 | 47.7 | 50.7 | 50.7 |
| Stack (N on the drawing) | 57.0 | 57.0 | 60.3 | 60.3 | 60.7 | 60.7 | 61.2 | 61.2 | 63.0 | 63.0 |
| Position | Low | Low | Low | Low | Low | Low | Low | Low | Low | Low |
| Wheel size | 27.5" | 27.5" | 29" | 29" | 29" | 29" | 29" | 29" | 29" | 29" |
| Eff. seat tube angle | 76.0° | 76.0° | 76.9° | 76.9° | 76.2° | 76.2° | 75.9° | 75.9° | 75.2° | 75.2° |
| Front Center | 71.7 | 71.7 | 75.5 | 75.5 | 77.2 | 77.2 | 78.9 | 78.9 | 82.7 | 82.7 |
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.
“Little bike, big punch”
The Gen 4 Top Fuel always left me with a smile on my face and energy in the tank for another lap. Trek have done an excellent job producing a bike that rips the climbs and still has legs for a rowdy descent.
theloamwolf.com · Read the review
“More capable & adaptable than ever”
The Top Fuel manages to feel quick and efficient without any harshness, a feat that's not easy to accomplish.
pinkbike.com · Read the review
“increased versatility and broader appeal”
The added ability to futz with not just head/seat angle and bb height, but also play with shock progression AND maybe even long-stroke the bike for more travel is appealing.
nsmb.com · Read the review
“enthusiastic and sporty, offering up impressive pedal efficiency with loads of grip.”
Mind you, it only took a few pedal strokes to appreciate the Top Fuel’s efficient and responsive demeanour.[...]Heading across rockier singletrack, the new bike is noticeably sprightlier and springier than its predecessor.
flowmountainbike.com · Read the review
“Dear lord, this bike is a hoot”
I keep finding myself on top of bigger moves than Trek would probably recommend for the Top Fuel, and I keep bouncing out the bottom more in love with the bike.
bikemag.com · Read the review
“light, lively, and efficient”
...the Top Fuel stands out for being just a touch more composed and forgiving (in terms of its suspension performance) than most of the bikes that it compares most directly to on paper.
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.
