1981 Trek Bikes 710 Base

	52	49	56	60	64
Stack	499.1mm	475.6mm	537.6mm	574.5mm	611.2mm
Reach	396.5mm	409.5mm	400.8mm	399.7mm	397.9mm
Stack to Reach Ratio	1.26:1	1.16:1	1.34:1	1.44:1	1.54:1
Seat Tube Length, C-T	520mm	490mm	560mm	600mm	640mm
Top Tube Length, Effective/Horizontal Center	545mm	530mm	560mm	575mm	590mm
Top Tube Length, Actual C-C	545mm	530mm	560mm	575mm	590mm
Top Tube Slope	0deg	0deg	0deg	0deg	0deg
Head Tube Angle	72.5deg	73deg	73.5deg	73.5deg	73.5deg
Seat Tube Angle	73.5deg	76deg	73.5deg	73deg	72.5deg
Bottom Bracket Drop	72mm	72mm	72mm	72mm	72mm
Bottom Bracket Height	262mm	262mm	262mm	262mm	262mm
Chainstay Length	435mm	435mm	435mm	435mm	435mm
Chainstay Length Horizontal	429mm	429mm	429mm	429mm	429mm
Front-Center	590.4mm	584.5mm	591.4mm	603.3mm	613.2mm
Front-Center Horizontal	586mm	580mm	587mm	599mm	609mm
Wheelbase	1015mm	1009mm	1016mm	1028mm	1038mm
Fork Offset/Rake	55mm	55mm	45mm	55mm	55mm
Trail	47.6mm mid/neutral	44.6mm low	52mm mid/neutral	41.6mm low	41.6mm low
Mechanical Trail	45.4mm	42.7mm	49.9mm	39.9mm	39.9mm
Wheel Flop	13.7mm	12.5mm	14.2mm	11.3mm	11.3mm
Tire to Pedal Spindle	86.4mm 170 mm cranks	80.5mm 170 mm cranks	87.4mm 170 mm cranks	99.3mm 170 mm cranks	109.2mm 170 mm cranks
Pedal Spindle to Ground Clearance	92mm 170 mm cranks	92mm 170 mm cranks	92mm 170 mm cranks	92mm 170 mm cranks	92mm 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:http://www.vintage-trek.com/images/trek/Trek81.pdf

Geometry