Factor OSTRO Gravel vs Factor SARANA: 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

Factor OSTRO Gravel: race geometry. Factor SARANA: endurance geometry.

  • The Factor SARANA stack is slightly taller, about 6 mm, which is not enough to change the position by itself.
  • The Factor SARANA cockpit is slightly shorter, by about 4 mm.

Independent tests land on opposite sides here: Factor OSTRO Gravel is called firm, Factor SARANA unusually smooth for a race bike.

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 OSTRO Gravel
Full size guide
2026 • endurance geometry
Factor SARANA
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 6 mm, reach 4 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 OSTRO Gravel and Factor SARANA sizes compare?

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

Factor OSTRO Gravel
49
Stack 515, Reach 377
Factor SARANA
49
Stack 544, Reach 378

Stack: 29 mm taller

Reach: practically identical

Factor OSTRO Gravel
52
Stack 535, Reach 385
Factor SARANA
49
Stack 544, Reach 378

Stack: 9 mm taller

Reach: 7 mm shorter

Factor OSTRO Gravel
54
Stack 555, Reach 394
Factor SARANA
52
Stack 558, Reach 388

Stack: 3 mm taller

Reach: 6 mm shorter

Factor OSTRO Gravel
56
Stack 580, Reach 402
Factor SARANA
54
Stack 573, Reach 398

Stack: 7 mm lower

Reach: 4 mm shorter

Factor OSTRO Gravel
58
Stack 605, Reach 412
Factor SARANA
58
Stack 613, Reach 418

Stack: 8 mm taller

Reach: 6 mm longer

Factor OSTRO Gravel
61
Stack 625, Reach 422
Factor SARANA
58
Stack 613, Reach 418

Stack: 12 mm lower

Reach: 4 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: Factor OSTRO Gravel or Factor SARANA?
The Factor SARANA stack is slightly taller, about 6 mm, which is not enough to change the position by itself.

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