1985 Trek Bikes 720 Base

	19in	22.5in	21in	24in	25.5in	25.5in
Stack	485.9mm	569.9mm	532.6mm	606.2mm	642.6mm	642.6mm
Reach	398.1mm	385.5mm	397.9mm	389.3mm	393.2mm	393.2mm
Stack to Reach Ratio	1.22:1	1.48:1	1.34:1	1.56:1	1.63:1	1.63:1
Seat Tube Length, C-C	472mm	561mm	522mm	599mm	637mm	637mm
Top Tube Length, Effective/Horizontal Center	543mm	560mm	561mm	575mm	590mm	590mm
Top Tube Length, Actual C-C	543mm	560mm	561mm	575mm	590mm	590mm
Top Tube Slope	0deg	0deg	0deg	0deg	0deg	0deg
Head Tube Angle	72deg	72.5deg	72.5deg	72.5deg	72.5deg	72.5deg
Seat Tube Angle	73.5deg	73deg	73deg	73deg	73deg	73deg
Bottom Bracket Drop	72mm	72mm	72mm	72mm	72mm	72mm
Bottom Bracket Height	274.8mm	274.8mm	274.8mm	274.8mm	275mm	274.8mm
Chainstay Length	470mm	470mm	470mm	470mm	470mm	470mm
Chainstay Length Horizontal	464.5mm	464.5mm	464.5mm	464.5mm	464.5mm	464.5mm
Front-Center	601.9mm	601.9mm	601.9mm	615.8mm	632.7mm	632.7mm
Front-Center Horizontal	597.6mm	597.6mm	597.6mm	611.6mm	628.6mm	628.6mm
Wheelbase	1062mm	1062mm	1062mm	1076mm	1093mm	1093mm
Fork Offset/Rake	52mm	52mm	52mm	52mm	52mm	52mm
Trail	58mm mid/neutral	54.8mm mid/neutral	54.8mm mid/neutral	54.8mm mid/neutral	54.9mm mid/neutral	54.8mm mid/neutral
Mechanical Trail	55.2mm	52.3mm	52.3mm	52.3mm	52.3mm	52.3mm
Wheel Flop	17mm	15.7mm	15.7mm	15.7mm	15.7mm	15.7mm
Tire to Pedal Spindle	85.1mm 170 mm cranks	85.1mm 170 mm cranks	85.1mm 170 mm cranks	99mm 170 mm cranks	115.7mm 170 mm cranks	115.9mm 170 mm cranks
Pedal Spindle to Ground Clearance	104.8mm 170 mm cranks	104.8mm 170 mm cranks	104.8mm 170 mm cranks	104.8mm 170 mm cranks	105mm 170 mm cranks	104.8mm 170 mm cranks

	19in	22.5in	21in	24in	25.5in	25.5in
Wheel Size	630mm BSD 630 mm BSD	630mm BSD 630 mm BSD	630mm BSD 630 mm BSD	630mm BSD 630 mm BSD	630mm BSD 630 mm BSD	630mm BSD 630 mm BSD
Tire Width	1.25in	1.25in	1.25in	1.25in	32mm	1.25in
Tire Outer Diameter	693.5mm	693.5mm	693.5mm	693.5mm	694mm	693.5mm
Bike Length with Tires	1755.5mm	1755.5mm	1755.5mm	1769.5mm	1787mm	1786.5mm

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.

Learn more about the Upright/Aggressive Scale

Category Trend

Touring

Source:https://vintage-trek.com/images/trek/85TrekTouring.pdf, https://vintage-trek.com/images/trek/85TrekTouring.pdf, https://www.pedalroom.com/p/1985-trek-720-touring-bike-restored-16117_7.jpg

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1985 Trek Bikes 720 Base

Geometry

Base Build

Stack and Reach vs. Category Trend