Factor ALUTO vs Factor OSTRO Gravel: 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: these frames put you in effectively the same position. Choose on verified generation changes, build and price; use your measurements to confirm size and setup.

Compare them for meCompare geometry and sizes

In one look

Factor ALUTO: race geometry. Factor OSTRO Gravel: race geometry.

  • Across matched sizes the Factor ALUTO and Factor OSTRO Gravel front ends are within a few millimetres of each other, so posture will depend more on cockpit setup than on the frame.
  • Reach is nearly identical across matched sizes.

These two split on maximum tyre clearance. Which bike is which, and what it costs you in servicing and on the ride, is in the full comparison.

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
Factor ALUTO
Full size guide
2026 • race geometry
Factor OSTRO Gravel
Full size guide

Fit and size differences

Geometry does not separate these bikes: matched sizes put the rider in effectively the same position.

Median difference across matched sizes: stack 2 mm, reach 0 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 Factor ALUTO and Factor OSTRO Gravel sizes compare?

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

Factor ALUTO
49
Stack 530, Reach 377
Factor OSTRO Gravel
52
Stack 535, Reach 385

Stack: 5 mm taller

Reach: 8 mm longer

Factor ALUTO
52
Stack 547, Reach 385
Factor OSTRO Gravel
52
Stack 535, Reach 385

Stack: 12 mm lower

Reach: practically identical

Factor ALUTO
54
Stack 565, Reach 393
Factor OSTRO Gravel
54
Stack 555, Reach 394

Stack: 10 mm lower

Reach: practically identical

Factor ALUTO
56
Stack 585, Reach 402
Factor OSTRO Gravel
56
Stack 580, Reach 402

Stack: 5 mm lower

Reach: practically identical

Factor ALUTO
58
Stack 605, Reach 412
Factor OSTRO Gravel
58
Stack 605, Reach 412

Stack: practically identical

Reach: practically identical

Factor ALUTO
61
Stack 625, Reach 422
Factor OSTRO Gravel
61
Stack 625, Reach 422

Stack: practically identical

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 has the taller front end: Factor ALUTO or Factor OSTRO Gravel?
Across matched sizes the Factor ALUTO and Factor OSTRO Gravel front ends are within a few millimetres of each other, so posture will depend more on cockpit setup than on the frame.

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