Factor ALUTO geometryGravel · 2026 · 6 sizes, from 49 to 61

The Factor ALUTO is a gravel bike available in 6 sizes, from 49 to 61. Stack ranges from 530 to 625 mm and reach from 377 to 422 mm. Its geometry is low and long, with a racing fit.

Stack530–625mm

Reach377–422mm

Head angle71.5–73.0°

Chainstay length420–425mm

LivelyAgile rearQuick steeringLow BB

What size ALUTO do I need?

Enter the stack and reach of a bike that fits you well and we will tell you which size is closest and how to set it up.

Stack in mm Reach in mm Compare on Fitbikefy →

49S 530 · R 377

52S 547 · R 385

54S 565 · R 393

56S 585 · R 402

58S 605 · R 412

61S 625 · R 422

Enter your stack and reach to see which size fits you best.

Geometry chart by size

Measurements in mm and degrees, as published by Factor. The ones that matter most for choosing a size are in bold.

Size	49	52	54	56	58	61
Stack	530	547	565	585	605	625
Reach	377	385	393	402	412	422
Head angle	71.5°	71.9°	72.0°	72.0°	72.0°	73.0°
Chainstay length	420	420	420	423	425	425
Wheelbase	993	1,003	1,017	1,035	1,053	1,070
BB drop	80	80	78	78	78	78
Fork offset	50	50	50	50	50	50
Trail	64	62	61	61	61	61
Standover	750	770	793	812	833	851
Seat tube (method not stated)	455	480	505	525	549	565
Seat angle (method not stated)	74.5°	74.0°	74.0°	73.5°	73.5°	73.5°

Source: Factor official website · data from 11 Nov 2026.

Stack and reach of every size

Higher means a taller front end; further right means a longer reach. The blue dot is your search.

Character of each size

Compared with other gravel bikes. Further right means more of that quality.

Positionracing → relaxed

Steeringcalm → quick

Pedallingrearward → forward

Bottom brackethigh → low

Wheelbaselively → planted

Rear endstable → agile

Bikes with similar geometry (size 54)

The closest size of other gravel models, by stack and reach.

ModelΔ stackΔ reach

Wilier Triestina Jaroon · S2027+2 mm−1 mmCompare →

Wilier Triestina Jaroon Alu · S2024+2 mm−1 mmCompare →

Megamo West · S2027−2 mm−2 mmCompare →

Ridley Kanzo Fast 2.0 · S2026−4 mm+1 mmCompare →

KTM Gravelator Prime · S2027±0 mm−5 mmCompare →

KTM Gravelator Master · S2027±0 mm−5 mmCompare →

Frequently asked questions

What size ALUTO do I need?

It depends on your position, not just your height. The most reliable way is to compare the stack and reach of a bike that fits you with those of each size (from 530/377 mm in size 49 to 625/422 mm in size 61). The size finder on this page shows the closest size and the stem and spacers you would need.

What are the stack and reach of the ALUTO in size 54?

Stack of 565 mm and reach of 393 mm.

Is the ALUTO a racing or an endurance bike?

Racing. In size 54 its stack-to-reach ratio is at percentile 30 of gravel bikes: a low, stretched position.