Compare: 2025 Factor Bikes OSTRO GRAVEL Carbon 61 vs 2026 SEKA exaero gr Base 61

Insights

Somewhat upright stack and reach vs trend of progressive gravel bikes

Design deviates from other sizes of Factor Bikes OSTRO GRAVEL

Somewhat aggressive stack and reach vs trend of all-road/gravel bikes

Design deviates from other sizes of SEKA exaero gr

Stack	625mm	620mm -5mm
Reach	422mm	408mm -14mm
Stack to Reach Ratio	1.48:1	1.52:1
Seat Tube Length, C-T	545mm	580mm +35mm
Top Tube Length, Effective/Horizontal Center	—	598mm
Top Tube Slope	10.1deg	6.5deg -3.6deg
Head Tube Angle	72.3deg	72.2deg -0.1deg
Seat Tube Angle	73.5deg	73deg -0.5deg
Head Tube Length	—	195mm
Bottom Bracket Drop	74mm	70mm -4mm
Bottom Bracket Height	277mm	286mm +9mm
Chainstay Length	425mm	423mm -2mm
Chainstay Length Horizontal	418.5mm	417.2mm -1.3mm
Front-Center	654.7mm	641mm -13.7mm
Front-Center Horizontal	650.5mm	637.8mm -12.7mm
Wheelbase	1069mm	1055mm -14mm
Fork Offset/Rake	50mm	50mm +0mm
Fork Length (Axle-To-Crown)	—	401mm
Trail	59.5mm mid/neutral	61.8mm +2.3mm mid/neutral
Mechanical Trail	56.7mm	58.8mm +2.1mm
Wheel Flop	17.2mm	18mm +0.8mm
Standover Height	847mm	858mm +11mm
Tire to Pedal Spindle	133.7mm 170 mm cranks	115mm -18.7mm 170 mm cranks
Pedal Spindle to Ground Clearance	107mm 170 mm cranks	116mm +9mm 170 mm cranks

Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	40mm	45mm +5mm
Tire Outer Diameter	702mm	712mm +10mm
Bike Length with Tires	1771mm	1767mm -4mm
Suspension Type	Rigid, non-suspension corrected	Rigid, non-suspension corrected
Bar Type	Drop Bar	Drop Bar
Frame Material	Carbon/Composite	Carbon/Composite
Fork Material	Carbon/Composite	Carbon/Composite
Brake Type	Disc	Disc

Actions	Collection I've Ridden	Collection I've Ridden
Source	https://factorbikes.com/bikes/ostro-gravel	https://drive.google.com/drive/folders/1NG_n27uMS0e34BqDwYOMyS3q6g26d4q2
Brand	Factor Bikes	SEKA
Bike	2025 OSTRO GRAVEL Carbon	2026 exaero gr Base
Size	61	61
Category	Progressive Gravel	All-road/Gravel