Can the same rider take different sizes on these two bikes?

Yes. Frame labels are not standardized, so the same rider may need different sizes. This comparison deliberately avoids a generic matched-size answer and hands your measurements to Bike Fit instead.

Which frame has the higher front: Orbea Orca Aero M30i LTD or Trek Madone Gen 8?

The frame front of Trek Madone Gen 8 is slightly higher, by about 6 mm. That difference alone does not settle your position.

Orbea Orca Aero M30i LTD vs Trek Madone Gen 8: which bike is right for you?

Compare ride character, intended rider, geometry, and fit. Add your measurements to see which bike suits you better and which size to choose on each.

Fit verdict: the frame positions are close, a few millimetres apart. The frame alone will not decide this; use your measurements to see which size and setup gets nearer to your position on each bike.

Compare them for me Compare geometry and sizes

In one look

Orbea Orca Aero M30i LTD: race geometry. Trek Madone Gen 8: race geometry.

The frame front of Trek Madone Gen 8 is slightly higher, by about 6 mm. That difference alone does not settle your position.
The forward length of the frame is nearly the same across matched sizes.

Independent tests land on opposite sides here: Orbea Orca Aero M30i LTD is called firm, Trek Madone Gen 8 unusually smooth for a race bike.

Price
Orbea Orca Aero M30i LTD is the dearer of the two, going by the cheapest build you can buy of each; Trek Madone Gen 8 starts lower.

Subjective findings from independent tests on stock or near-stock builds. Tyres, pressure and size change how a frame feels.

We compare differences at frame and model level. Components, current price, and availability depend on the exact build and seller.

2026 • race geometry: Orbea Orca Aero M30i LTD; Size guide and geometry for the Orbea Orca Aero M30i LTD
2025 • race geometry: Trek Madone Gen 8; Size guide and geometry for the Trek Madone Gen 8

What do you need from this comparison?

Start with the decision you are making. We will ask only for the details needed to answer it.

Step 1/1

What are you trying to understand?

Your answer decides which questions follow and what the result focuses on.

Fit and size differences

The matched frame measurements differ by only a few millimetres, so stem and spacer choices can matter more than the frame.

Typical difference across matched sizes: frame front height 6 mm, forward length 2 mm.

For a personal answer, the fit-and-size path uses your measurements to show only the relevant frame sizes. The full chart remains available as a reference.

View geometry for every size

How do Orbea Orca Aero M30i LTD and Trek Madone Gen 8 sizes compare?

See the closest size matches and the differences in stack, reach, and riding position.

Orbea Orca Aero M30i LTD: 47; Stack 495, Reach 370
Trek Madone Gen 8: XS; Stack 507, Reach 370

Stack: 12 mm taller

Reach: practically identical

Orbea Orca Aero M30i LTD: 49; Stack 504, Reach 375
Trek Madone Gen 8: XS; Stack 507, Reach 370

Stack: 3 mm taller

Reach: 5 mm shorter

Orbea Orca Aero M30i LTD: 51; Stack 520, Reach 380
Trek Madone Gen 8: S; Stack 530, Reach 378

Stack: 10 mm taller

Reach: practically identical

Orbea Orca Aero M30i LTD: 53; Stack 540, Reach 385
Trek Madone Gen 8: M; Stack 546, Reach 384

Stack: 6 mm taller

Reach: practically identical

Orbea Orca Aero M30i LTD: 55; Stack 560, Reach 390
Trek Madone Gen 8: ML; Stack 562, Reach 389

Stack: practically identical

Reach: practically identical

Orbea Orca Aero M30i LTD: 57; Stack 578, Reach 397
Trek Madone Gen 8: L; Stack 582, Reach 394

Stack: 4 mm taller

Reach: 3 mm shorter

Orbea Orca Aero M30i LTD: 60; Stack 604, Reach 404
Trek Madone Gen 8: XL; Stack 610, Reach 402

Stack: 6 mm taller

Reach: practically identical

Orbea Orca Aero M30i LTD	Trek Madone Gen 8	The position will feel
47Stack 495 · Reach 370	XSStack 507 · Reach 370	Stack: 12 mm taller · Reach: practically identical
49Stack 504 · Reach 375	XSStack 507 · Reach 370	Stack: 3 mm taller · Reach: 5 mm shorter
51Stack 520 · Reach 380	SStack 530 · Reach 378	Stack: 10 mm taller · Reach: practically identical
53Stack 540 · Reach 385	MStack 546 · Reach 384	Stack: 6 mm taller · Reach: practically identical
55Stack 560 · Reach 390	MLStack 562 · Reach 389	Stack: practically identical · Reach: practically identical
57Stack 578 · Reach 397	LStack 582 · Reach 394	Stack: 4 mm taller · Reach: 3 mm shorter
60Stack 604 · Reach 404	XLStack 610 · Reach 402	Stack: 6 mm taller · Reach: practically identical

The same size label can create a different position on each frame. Stack and reach are one part of the decision; the personalized comparison connects them to your body and each bike’s ride character.

FAQ

Can the same rider take different sizes on these two bikes?: Yes. Frame labels are not standardized, so the same rider may need different sizes. This comparison deliberately avoids a generic matched-size answer and hands your measurements to Bike Fit instead.
Which frame has the higher front: Orbea Orca Aero M30i LTD or Trek Madone Gen 8?: The frame front of Trek Madone Gen 8 is slightly higher, by about 6 mm. That difference alone does not settle your position.

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