1989 Diamondback Bicycles Ascent Base

	15	17	19	20.5	52.1	22.5
Seat Tube Length, C-T	—	—	—	—	505mm	—
Seat Tube Length, Unknown	15mm	17mm	19mm	20.5mm	—	22.5mm
Top Tube Length, Effective/Horizontal Unknown	539mm	548mm	563mm	570mm	585mm	590mm
Head Tube Angle	70deg	70deg	70deg	70deg	71deg	70deg
Seat Tube Angle	73deg	73deg	73deg	73deg	73deg	73deg
Bottom Bracket Drop	29.5mm	29.5mm	29.5mm	29.5mm	34.5mm	29.5mm
Bottom Bracket Height	300mm	300mm	300mm	300mm	295mm	300mm
Chainstay Length	430mm	430mm	430mm	430mm	430mm	430mm
Chainstay Length Horizontal	429mm	429mm	429mm	429mm	428.6mm	429mm
Front-Center	609.7mm	609.7mm	627.7mm	639.7mm	638.3mm	660.7mm
Front-Center Horizontal	609mm	609mm	627mm	639mm	637.4mm	660mm
Wheelbase	1038mm	1038mm	1056mm	1068mm	1066mm	1089mm
Fork Offset/Rake	50mm	45mm	45mm	45mm	480mm	45mm
Trail	66.7mm high	72mm high	72mm high	72mm high	-394.2mm	72mm high
Mechanical Trail	62.7mm	67.7mm	67.7mm	67.7mm	-372.7mm	67.7mm
Wheel Flop	21.4mm	23.2mm	23.2mm	23.2mm	-121.3mm	23.2mm
Tire to Pedal Spindle	110.2mm 170 mm cranks	110.2mm 170 mm cranks	128.2mm 170 mm cranks	140.2mm 170 mm cranks	138.8mm 170 mm cranks	161.2mm 170 mm cranks
Pedal Spindle to Ground Clearance	130mm 170 mm cranks	130mm 170 mm cranks	130mm 170 mm cranks	130mm 170 mm cranks	125mm 170 mm cranks	130mm 170 mm cranks

	15	17	19	20.5	52.1	22.5
Wheel Size	26 in 559 mm BSD	26 in 559 mm BSD	26 in 559 mm BSD	26 in 559 mm BSD	26 in 559 mm BSD	26 in 559 mm BSD
Tire Width	50mm	50mm	50mm	50mm	50mm	50mm
Tire Outer Diameter	659mm	659mm	659mm	659mm	659mm	659mm
Bike Length with Tires	1697mm	1697mm	1715mm	1727mm	1725mm	1748mm

Source:https://www.retrobike.co.uk/gallery2/d/60225-2/Ascent.jpg, magazines

Geometry