2021 Trek Bikes FX 4 Disc

	S	M	L	XL
Stack	539mm	557mm	586mm	618mm
Reach	393mm	397mm	398mm	398mm
Stack to Reach Ratio	1.37:1	1.4:1	1.47:1	1.55:1
Seat Tube Length, C-T	381mm	445mm	508mm	572mm
Top Tube Length, Effective/Horizontal Center	542mm	557mm	571mm	587mm
Top Tube Slope	19.2deg	14deg	10.3deg	7.2deg
Head Tube Angle	70.5deg	71.5deg	71.5deg	72.5deg
Seat Tube Angle	74.5deg	74deg	73.5deg	73deg
Head Tube Length	115mm	130mm	160mm	190mm
Bottom Bracket Drop	65mm	65mm	65mm	65mm
Bottom Bracket Height	267mm	267mm	267mm	267mm
Chainstay Length	450mm	450mm	450mm	450mm
Chainstay Length Horizontal	445.3mm	445.3mm	445.3mm	445.3mm
Front-Center	617.2mm	618.2mm	628.1mm	628.1mm
Front-Center Horizontal	613.7mm	614.7mm	624.7mm	624.7mm
Wheelbase	1059mm	1060mm	1070mm	1070mm
Fork Offset/Rake	49.8mm	50.4mm	49.7mm	49.9mm
Trail	64.7mm mid/neutral	58mm mid/neutral	58.7mm mid/neutral	52.3mm mid/neutral
Mechanical Trail	61mm	55mm	55.7mm	49.9mm
Wheel Flop	20.4mm	17.5mm	17.7mm	15mm
Standover Height	704mm	738mm	799mm	848mm
Tire to Pedal Spindle	115.2mm 170 mm cranks	116.2mm 170 mm cranks	126.1mm 170 mm cranks	126.1mm 170 mm cranks
Pedal Spindle to Ground Clearance	97mm 170 mm cranks	97mm 170 mm cranks	97mm 170 mm cranks	97mm 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.trekbikes.com/ca/en_CA/bikes/hybrid-bikes/fitness-bikes/fx/fx-4-disc/p/34135/

Geometry