2021 Viathon Bicycles G.1 Base (700c)

	520	540	560	580	600
Stack	545mm	565.8mm	582mm	598.2mm	612.5mm
Reach	378.9mm	382.8mm	387.6mm	392.1mm	408mm
Stack to Reach Ratio	1.44:1	1.48:1	1.5:1	1.53:1	1.5:1
Seat Tube Length, C-T	520mm	540mm	560mm	580mm	600mm
Top Tube Length, Effective/Horizontal HT Top	530mm	545mm	560mm	575mm	595mm
Top Tube Slope	4.9deg	5deg	4.7deg	4.4deg	3.8deg
Head Tube Angle	71deg	71.5deg	72deg	72.5deg	72.5deg
Seat Tube Angle	74.5deg	74deg	73.5deg	73deg	73deg
Head Tube Length	125mm	145mm	160mm	175mm	190mm
Bottom Bracket Drop	69mm	69mm	69mm	69mm	69mm
Bottom Bracket Height	282mm	282mm	282mm	282mm	282mm
Chainstay Length	425mm	425mm	425mm	425mm	425mm
Chainstay Length Horizontal	419.4mm	419.4mm	419.4mm	419.4mm	419.4mm
Front-Center	598mm	604mm	609mm	613mm	634mm
Front-Center Horizontal	593.6mm	599.6mm	604.6mm	609.6mm	629.6mm
Wheelbase	1013mm	1019mm	1024mm	1029mm	1049mm
Fork Offset/Rake	48mm	48mm	48mm	48mm	48mm
Fork Length, Unknown	394mm	394mm	394mm	394mm	394mm
Trail	70.1mm high	66.8mm high	63.6mm mid/neutral	60.3mm mid/neutral	60.3mm mid/neutral
Mechanical Trail	66.3mm	63.4mm	60.5mm	57.6mm	57.6mm
Wheel Flop	21.6mm	20.1mm	18.7mm	17.3mm	17.3mm
Tire to Pedal Spindle	77mm 170 mm cranks	83mm 170 mm cranks	88mm 170 mm cranks	92mm 170 mm cranks	113mm 170 mm cranks
Pedal Spindle to Ground Clearance	112mm 170 mm cranks	112mm 170 mm cranks	112mm 170 mm cranks	112mm 170 mm cranks	112mm 170 mm cranks

Very Upright

Somewhat Upright

Average

Somewhat Aggressive

Very Aggressive

The Bike Insights Upright/Aggressive scale is based on analysis of a bike’s proportions relative to similar sized bikes in the same category.

Category Trend

Source:https://www.viathonbicycles.com/collections/gravel-multi-surface-g-1/products/g-1-grx-600?variant=30117410504817

Geometry