Compare: 2025 Factor Bikes OSTRO GRAVEL Carbon 61 vs 2023 Seaboard GR02 Base 59

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 Seaboard GR02

Stack	625mm	611.8mm -13.2mm
Reach	422mm	404.5mm -17.5mm
Stack to Reach Ratio	1.48:1	1.51:1
Seat Tube Length, C-T	545mm	—
Seat Tube Length, Unknown	—	590mm
Top Tube Length, Effective/Horizontal Unknown	—	580mm
Top Tube Slope	10.1deg	4.5deg -5.6deg
Head Tube Angle	72.3deg	72deg -0.3deg
Seat Tube Angle	73.5deg	74deg +0.5deg
Head Tube Length	—	19mm
Bottom Bracket Drop	74mm	70mm -4mm
Bottom Bracket Height	277mm	278mm +1mm
Chainstay Length	425mm	425mm +0mm
Chainstay Length Horizontal	418.5mm	419.2mm +0.7mm
Front-Center	654.7mm	637.1mm -17.6mm
Front-Center Horizontal	650.5mm	633.2mm -17.3mm
Wheelbase	1069mm	1052.4mm -16.6mm
Fork Offset/Rake	50mm	50.1mm +0.1mm
Trail	59.5mm mid/neutral	60.4mm +0.9mm mid/neutral
Mechanical Trail	56.7mm	57.5mm +0.8mm
Wheel Flop	17.2mm	17.8mm +0.6mm
Standover Height	847mm	—
Tire to Pedal Spindle	133.7mm 170 mm cranks	119.1mm -14.6mm 170 mm cranks
Pedal Spindle to Ground Clearance	107mm 170 mm cranks	108mm +1mm 170 mm cranks

Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	40mm	37mm -3mm
Tire Outer Diameter	702mm	696mm -6mm
Bike Length with Tires	1771mm	1748.4mm -22.6mm
Suspension Type	Rigid, non-suspension corrected	Rigid, non-suspension corrected
Bar Type	Drop Bar	Drop Bar
Frame Material	Carbon/Composite	Aluminum
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://tsunamibicycle.com/product/seaboard-gr02-2022-gravel-bike-off-road-bike-touring-bike/
Brand	Factor Bikes	Seaboard
Bike	2025 OSTRO GRAVEL Carbon	2023 GR02 Base
Size	61	59
Category	Progressive Gravel	All-road/Gravel