1981 Trek Bikes 600 Base

	21"	22.5"	24"	25.5"
Stack	501.6mm	501.6mm	501.6mm	501.6mm
Reach	405.6mm	416.6mm	436.6mm	456.6mm
Stack to Reach Ratio	1.24:1	1.2:1	1.15:1	1.1:1
Seat Tube Length, C-C	520mm	560mm	600mm	620mm
Top Tube Length, Effective/Horizontal Center	540mm	560mm	580mm	600mm
Top Tube Length, Actual C-C	540mm	560mm	580mm	600mm
Top Tube Slope	0deg	0deg	0deg	0deg
Head Tube Angle	73deg	73deg	73deg	73deg
Seat Tube Angle	73.5deg	73.5deg	73.5deg	73.5deg
Head Tube Length	78mm	78mm	78mm	78mm
Bottom Bracket Drop	72mm	72mm	72mm	72mm
Bottom Bracket Height	264mm	264mm	264mm	264mm
Chainstay Length	435mm	435mm	435mm	435mm
Chainstay Length Horizontal	429mm	429mm	429mm	429mm
Front-Center	588.4mm	599.3mm	619.2mm	639.1mm
Front-Center Horizontal	584mm	595mm	615mm	635mm
Wheelbase	1013mm	1024mm	1044mm	1064mm
Fork Offset/Rake	45mm	45mm	45mm	45mm
Fork Length (On-Axis)	365mm	365mm	365mm	365mm
Trail	55.7mm mid/neutral	55.7mm mid/neutral	55.7mm mid/neutral	55.7mm mid/neutral
Mechanical Trail	53.2mm	53.2mm	53.2mm	53.2mm
Wheel Flop	15.6mm	15.6mm	15.6mm	15.6mm
Tire to Pedal Spindle	82.4mm 170 mm cranks	93.3mm 170 mm cranks	113.2mm 170 mm cranks	133.1mm 170 mm cranks
Pedal Spindle to Ground Clearance	94mm 170 mm cranks	94mm 170 mm cranks	94mm 170 mm cranks	94mm 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/TrekBrochure1981.htm

Geometry