2026 Trek Bikes FX Sport AL 3

	XS (40)	S (45)	M (50)	L (55)	XL (60)
Stack	543mm	568mm	594mm	620mm	648mm
Reach	383mm	385mm	393mm	399mm	409mm
Stack to Reach Ratio	1.42:1	1.48:1	1.51:1	1.55:1	1.58:1
Seat Tube Length, C-C	330mm	375mm	420mm	465mm	520mm
Top Tube Length, Effective/Horizontal Unknown	528mm	543mm	563mm	583mm	613mm
Head Tube Angle	70deg	70.5deg	71deg	71.5deg	72.5deg
Seat Tube Angle	75deg	74.5deg	74deg	73.5deg	72.5deg
Head Tube Length	115mm	140mm	165mm	190mm	215mm
Bottom Bracket Drop	65mm	65mm	65mm	65mm	65mm
Bottom Bracket Height	288mm	288mm	288mm	288mm	288mm
Chainstay Length	447mm	447mm	447mm	447mm	447mm
Chainstay Length Horizontal	442.3mm	442.3mm	442.3mm	442.3mm	442.3mm
Front-Center	613.2mm	620.2mm	631.1mm	641.1mm	648mm
Front-Center Horizontal	609.8mm	616.8mm	627.8mm	637.8mm	644.8mm
Wheelbase	1052mm	1059mm	1070mm	1080mm	1087mm
Fork Offset/Rake	50mm	50mm	50mm	50mm	50mm
Trail	75.3mm high	72mm high	68.7mm high	65.4mm high	58.9mm mid/neutral
Mechanical Trail	70.7mm	67.8mm	64.9mm	62mm	56.2mm
Wheel Flop	24.2mm	22.6mm	21.1mm	19.7mm	16.9mm
Standover Height	675mm	715mm	754mm	791mm	836mm
Tire to Pedal Spindle	90.2mm 170 mm cranks	97.2mm 170 mm cranks	108.1mm 170 mm cranks	113.1mm 175 mm cranks	120mm 175 mm cranks
Pedal Spindle to Ground Clearance	118mm 170 mm cranks	118mm 170 mm cranks	118mm 170 mm cranks	113mm 175 mm cranks	113mm 175 mm cranks

Published Sizing Recommendations

Height	147 cm to 155 cm	155 cm to 165 cm	165 cm to 175 cm	175 cm to 186 cm	186 cm to 197 cm
PBH	69 cm to 73 cm	72 cm to 78 cm	77 cm to 83 cm	82 cm to 88 cm	87 cm to 91 cm

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/pl/pl_PL/rowery/rowery-hybrydowe/rowery-fitness/fx/fx-sport/f/F421-1/fx-sport-al-3/58592/5339888