2026 Jan Janssen Sector Base

	S	M	L	XL
Stack	552mm	586mm	611mm	635mm
Reach	362mm	370mm	384mm	397mm
Stack to Reach Ratio	1.52:1	1.58:1	1.59:1	1.6:1
Seat Tube Length, C-T	500mm	530mm	560mm	580mm
Top Tube Length, Effective/Horizontal HT Top	536mm	552mm	568mm	588mm
Top Tube Slope	8.1deg	8.5deg	7.8deg	8deg
Head Tube Angle	69.5deg	71deg	72.5deg	72.5deg
Seat Tube Angle	74deg	73.5deg	73.5deg	73.5deg
Head Tube Length	120mm	150mm	170mm	195mm
Bottom Bracket Drop	70mm	70mm	65mm	65mm
Bottom Bracket Height	286mm	286mm	291mm	291mm
Chainstay Length	430mm	430mm	430mm	430mm
Chainstay Length Horizontal	424.3mm	424.3mm	425.1mm	425.1mm
Front-Center	595.9mm	599.8mm	606.4mm	624.3mm
Front-Center Horizontal	591.7mm	595.7mm	602.9mm	620.9mm
Wheelbase	1016mm	1020mm	1028mm	1046mm
Fork Offset/Rake	45mm	45mm	45mm	45mm
Trail	85.1mm very high	75mm high	65.1mm high	65.1mm high
Mechanical Trail	79.7mm	70.9mm	62.1mm	62.1mm
Wheel Flop	27.9mm	23.1mm	18.7mm	18.7mm
Tire to Pedal Spindle	69.9mm 170 mm cranks	73.8mm 170 mm cranks	80.4mm 170 mm cranks	98.3mm 170 mm cranks
Pedal Spindle to Ground Clearance	116mm 170 mm cranks	116mm 170 mm cranks	121mm 170 mm cranks	121mm 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.janjanssen.nl/fiets/sector/?v=1a13105b7e4e

Geometry