Merida Reacto 10K 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 differ enough to matter. Compare the geometry below, then use your measurements to identify the safer size and setup.

Compare them for meCompare geometry and sizes

In one look

Merida Reacto 10K: race geometry. Trek Madone Gen 8: race geometry.

  • The Trek Madone Gen 8 stack is slightly taller, about 5 mm, which is not enough to change the position by itself.
  • The Trek Madone Gen 8 cockpit is slightly shorter, by about 6 mm.

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

2027 • race geometry
Merida Reacto 10K
Full size guide
2025 • race geometry
Trek Madone Gen 8
Full size guide

Fit and size differences

Geometry can separate these bikes: matched sizes create a meaningfully different position.

Median difference across matched sizes: stack 5 mm, reach 6 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 Merida Reacto 10K and Trek Madone Gen 8 sizes compare?

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

Merida Reacto 10K
3XS
Stack 512, Reach 373
Trek Madone Gen 8
XS
Stack 507, Reach 370

Stack: 5 mm lower

Reach: 3 mm shorter

Merida Reacto 10K
XXS
Stack 517, Reach 377
Trek Madone Gen 8
S
Stack 530, Reach 378

Stack: 13 mm taller

Reach: practically identical

Merida Reacto 10K
XS
Stack 529, Reach 384
Trek Madone Gen 8
S
Stack 530, Reach 378

Stack: practically identical

Reach: 6 mm shorter

Merida Reacto 10K
S
Stack 542, Reach 390
Trek Madone Gen 8
M
Stack 546, Reach 384

Stack: 4 mm taller

Reach: 6 mm shorter

Merida Reacto 10K
M
Stack 557, Reach 395
Trek Madone Gen 8
ML
Stack 562, Reach 389

Stack: 5 mm taller

Reach: 6 mm shorter

Merida Reacto 10K
L
Stack 571, Reach 400
Trek Madone Gen 8
L
Stack 582, Reach 394

Stack: 11 mm taller

Reach: 6 mm shorter

Merida Reacto 10K
XL
Stack 593, Reach 409
Trek Madone Gen 8
XL
Stack 610, Reach 402

Stack: 17 mm taller

Reach: 7 mm shorter

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 has the taller front end: Merida Reacto 10K or Trek Madone Gen 8?
The Trek Madone Gen 8 stack is slightly taller, about 5 mm, which is not enough to change the position by itself.

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