Compare: 2025 SL8 Specialized Bicycles Tarmac sl8 Pro 172.5mm vs 2026 Factor Bikes OSTRO VAM Base 54

Insights

Average stack and reach vs trend of performance road bikes

Design deviates from other sizes of Factor Bikes OSTRO VAM

Stack	544mm	542mm -2mm
Reach	384mm	384mm +0mm
Stack to Reach Ratio	1.42:1	1.41:1
Seat Tube Length, Unknown	473mm	502mm +29mm
Top Tube Length, Effective/Horizontal Center	541mm	—
Top Tube Slope	9.9deg	6.5deg -3.4deg
Head Tube Angle	73deg	72.5deg -0.5deg
Seat Tube Angle	74deg	74deg +0deg
Head Tube Length	137mm	—
Bottom Bracket Drop	72mm	70mm -2mm
Bottom Bracket Height	265mm	271mm +6mm
Chainstay Length	410mm	405mm -5mm
Chainstay Length Horizontal	403.6mm	398.9mm -4.7mm
Front-Center	579mm	590.3mm +11.3mm
Front-Center Horizontal	574.4mm	586.1mm +11.7mm
Wheelbase	978mm	985mm +7mm
Fork Offset/Rake	44.1mm	48mm +3.9mm
Fork Length, Unknown	370mm	—
Trail	57mm mid/neutral	57.2mm +0.2mm mid/neutral
Mechanical Trail	54.5mm	54.5mm +0mm
Wheel Flop	15.9mm	16.4mm +0.5mm
Standover Height	768mm	781mm +13mm
Tire to Pedal Spindle	72mm 170 mm cranks	79.3mm +7.3mm 170 mm cranks
Pedal Spindle to Ground Clearance	95mm 170 mm cranks	101mm +6mm 170 mm cranks

Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	26mm	30mm +4mm
Tire Outer Diameter	674mm	682mm +8mm
Bike Length with Tires	1652mm	1667mm +15mm
Handlebar Width	400mm	—
Stem Length	100mm	—
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://www.specialized.com/us/en/tarmac-sl8-pro-ultegra-di2/p/4274935?color=5430657-4274935	https://factorbikes.com/bikes/ostro-vam
Brand	Specialized Bicycles	Factor Bikes
Bike	2025 SL8 Tarmac sl8 Pro	2026 OSTRO VAM Base
Size	172.5mm	54
Category	Performance Road	Performance Road