2025 Trek Bikes FX 3

	S	M	L	XL	XXL
Stack	568mm	594mm	620mm	648mm	673mm
Reach	385mm	393mm	399mm	409mm	416mm
Stack to Reach Ratio	1.48:1	1.51:1	1.55:1	1.58:1	1.62:1
Seat Tube Length, Unknown	375mm	420mm	465mm	520mm	585mm
Top Tube Length, Effective/Horizontal Center	543mm	563mm	583mm	613mm	635mm
Top Tube Slope	23.1deg	20.5deg	18.2deg	15.1deg	11.1deg
Head Tube Angle	70.5deg	71deg	71.5deg	72.5deg	73deg
Seat Tube Angle	74.5deg	74deg	73.5deg	72.5deg	72deg
Head Tube Length	140mm	165mm	190mm	215mm	240mm
Bottom Bracket Drop	65mm	65mm	65mm	65mm	65mm
Bottom Bracket Height	281mm	281mm	281mm	281mm	281mm
Chainstay Length	447mm	447mm	447mm	447mm	447mm
Chainstay Length Horizontal	442.3mm	442.3mm	442.3mm	442.3mm	442.3mm
Front-Center	620.2mm	631.1mm	641.1mm	648mm	658mm
Front-Center Horizontal	616.8mm	627.8mm	637.8mm	644.8mm	654.8mm
Wheelbase	1059mm	1070mm	1080mm	1087mm	1097mm
Fork Offset/Rake	50mm	50mm	50mm	50mm	50mm
Trail	69.5mm high	66.3mm high	63.1mm mid/neutral	56.7mm mid/neutral	53.5mm mid/neutral
Mechanical Trail	65.5mm	62.7mm	59.8mm	54mm	51.2mm
Wheel Flop	21.9mm	20.4mm	19mm	16.3mm	15mm
Standover Height	715mm	754mm	791mm	836mm	884mm
Tire to Pedal Spindle	104.2mm 170 mm cranks	115.1mm 170 mm cranks	125.1mm 170 mm cranks	132mm 170 mm cranks	142mm 170 mm cranks
Pedal Spindle to Ground Clearance	111mm 170 mm cranks	111mm 170 mm cranks	111mm 170 mm cranks	111mm 170 mm cranks	111mm 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/us/en_US/bikes/hybrid-bikes/fitness-bikes/fx/fx-3-gen-4/p/40819/?colorCode=grey

Geometry