2025 Just Bikes JB04 Base

	51cm	53cm	55cm	57cm
Stack	539mm	556mm	572mm	582mm
Reach	388mm	391mm	393mm	406mm
Stack to Reach Ratio	1.39:1	1.42:1	1.46:1	1.43:1
Seat Tube Length, C-T	510mm	535mm	550mm	570mm
Top Tube Length, Effective/Horizontal Unknown	547mm	550mm	561mm	579mm
Top Tube Length, Actual C-C	532mm	538mm	548mm	567mm
Top Tube Slope	5.3deg	4.4deg	4.7deg	3.6deg
Head Tube Angle	71.6deg	72deg	72deg	72deg
Seat Tube Angle	73.6deg	74deg	73.5deg	73.5deg
Head Tube Length	130mm	150mm	160mm	170mm
Bottom Bracket Drop	64mm	60mm	67mm	670mm
Bottom Bracket Height	287mm	291mm	284mm	-319mm
Chainstay Length	425mm	425mm	425mm	425mm
Chainstay Length Horizontal	420.2mm	420.7mm	419.7mm	—
Front-Center	597.3mm	602.3mm	608mm	793.3mm
Front-Center Horizontal	593.9mm	599.3mm	604.3mm	424.7mm
Wheelbase	1014mm	1020mm	1024mm	1026mm
Fork Offset/Rake	45mm	45mm	45mm	45mm
Fork Length (Axle-To-Crown)	386mm	389mm	389mm	389mm
Trail	69.3mm high	66.7mm high	66.7mm high	66.7mm high
Mechanical Trail	65.8mm	63.5mm	63.5mm	63.5mm
Wheel Flop	20.8mm	19.6mm	19.6mm	19.6mm
Tire to Pedal Spindle	76.3mm 170 mm cranks	81.3mm 170 mm cranks	87mm 170 mm cranks	272.3mm 170 mm cranks
Pedal Spindle to Ground Clearance	117mm 170 mm cranks	121mm 170 mm cranks	114mm 170 mm cranks	-489mm 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://just-bikes.de/collections/gravel-bikes-cyclocross/products/just-bikes-jb04-gravel-bike-mit-shimano-grx-600-olivgrun

Geometry