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Trek Fuel LX Carbon geometryMTB · 2026 · 5 sizes, from S to XXL

The Trek Fuel LX Carbon is a mtb bike available in 5 sizes, from S to XXL. Stack ranges from 619 to 674 mm and reach from 418 to 518 mm. Its position sits between racing and endurance.

Stack619–674mm
Reach418–518mm
Head angle63.4–64.5°
Chainstay length437–452mm
PlantedCalm steeringHigh BBStable rearSteep seat angle

What size Fuel LX Carbon do I need?

Enter the stack and reach of a bike that fits you well and we will tell you which size is closest and how to set it up.

Compare on Fitbikefy →
SS 619 · R 418
MS 633 · R 448
LS 647 · R 473
XLS 651 · R 510
XXLS 674 · R 518

Enter your stack and reach to see which size fits you best.

Geometry chart by size

Measurements in mm and degrees, as published by Trek. The ones that matter most for choosing a size are in bold.

SizeSMLXLXXL
Stack619633647651674
Reach418448473510518
Effective top tube552586621651684
Head tube length95110125140155
Head angle63.4°63.4°63.4°64.5°63.5°
Effective seat angle77.5°77.2°76.4°76.9°75.4°
Actual seat angle71.5°71.5°71.5°72.6°71.6°
Chainstay length437437442447452
Wheelbase1,2001,2371,2731,2981,341
Front centre765801833854891
BB drop2627273527
BB height347347347339346
Fork offset4444444444
Trail138138137129137
Standover750752759755773
Seat tube (method not stated)370400420455475

Source: Trek official website · data from 11 Nov 2026.

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Trek Fuel LX Carbon 2026

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Stack and reach of every size

Higher means a taller front end; further right means a longer reach. The blue dot is your search.

400420440460480500520540580600620640660680700720reach (mm) →↑ stack (mm)SMLXLXXL

Character of each size

Compared with other mtb bikes. Further right means more of that quality.

S
M
L
XL
XXL
Positionracing → relaxed
Steeringcalm → quick
Pedallingrearward → forward
Bottom brackethigh → low
Wheelbaselively → planted
Rear endstable → agile

Bikes with similar geometry (size L)

The closest size of other mtb models, by stack and reach.

ModelΔ stackΔ reach
Trek Fuel LX Aluminium · L2026±0 mm±0 mmCompare →
Cannondale Habit Carbon LT · LG2022−3 mm+2 mmCompare →
Specialized S-Works Stumpjumper · S42026−3 mm−3 mmCompare →
Specialized Stumpjumper · S42026−3 mm−3 mmCompare →
Canyon Torque AL · M2027−4 mm−3 mmCompare →
Cube Reaction C:62 · XXL2026+6 mm−1 mmCompare →
Fuel LX Carbon or Fuel LX Aluminium? In size L they have exactly the same stack and reach (647 / 473 mm): the difference is in the frame and build, not the position.

Frequently asked questions

What size Fuel LX Carbon do I need?

It depends on your position, not just your height. The most reliable way is to compare the stack and reach of a bike that fits you with those of each size (from 619/418 mm in size S to 674/518 mm in size XXL). The size finder on this page shows the closest size and the stem and spacers you would need.

What are the stack and reach of the Fuel LX Carbon in size L?

Stack of 647 mm and reach of 473 mm, with an effective top tube of 621 mm and a head angle of 63.4°.

Is the Fuel LX Carbon a racing or an endurance bike?

In between. In size L its stack-to-reach ratio is at percentile 46 of mtb bikes: neither very low nor very tall.

Does it have the same geometry as the Fuel LX Aluminium?

In size L, yes: same stack and reach. If one already fits you, the same size of the other will put you in the same position.