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, so geometry will not decide this pair. What can: the sourced differences below and, once you enter your measurements, your size and setup on each frame.

Compare them for meCompare geometry and sizes

In one look

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

  • Across matched sizes, the frame fronts of Factor ALUTO and Factor OSTRO Gravel differ by only a few millimetres. Stem and spacer choices will have more effect on handlebar position.
  • The forward length of the frame is nearly the same across matched sizes.

These two split on maximum tyre clearance; the sourced values are below. What each difference means for your size, your setup and the riding you describe is in the full comparison.

  • Maximum tyre clearanceDiffersSource 1Source 2
    Factor ALUTO
    47 mm
    Factor OSTRO Gravel
    45 mm

    Tyre width decides which surfaces stay comfortable. A few millimetres is the difference between staying on tarmac and being able to drop onto gravel without a second bike.

  • Price

    Factor OSTRO Gravel is the dearer of the two, going by the cheapest build you can buy of each; Factor ALUTO 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
Factor ALUTO
Size guide and geometry for the Factor ALUTO
2026 • race geometry
Factor OSTRO Gravel
Size guide and geometry for the Factor OSTRO Gravel

Fit and size differences

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

Typical difference across matched sizes: frame front height 2 mm, forward length 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 frame has the higher front: Factor ALUTO or Factor OSTRO Gravel?
Across matched sizes, the frame fronts of Factor ALUTO and Factor OSTRO Gravel differ by only a few millimetres. Stem and spacer choices will have more effect on handlebar position.

TrainCraft training

Prepare for a goal or an event

Read training guides by goal and preparation roadmaps for cycling events, and use free structured workouts with .zwo export. Training plans are part of PRO. Adaptive plan changes that you review and apply are part of PRO AI.

Browse training plansView pricing