1989 Specialized Bicycles Rock Combo Base

	19 1/2
Stack	494.4mm
Reach	423.2mm
Stack to Reach Ratio	1.17:1
Seat Tube Length, C-TTT	498mm
Top Tube Length, Effective/Horizontal Center	580mm
Top Tube Length, Actual C-C	580mm
Top Tube Slope	0deg
Head Tube Angle	71deg
Seat Tube Angle	72.5deg
Bottom Bracket Drop	55.5mm
Bottom Bracket Height	262.1mm
Chainstay Length	434mm
Chainstay Length Horizontal	430.4mm
Front-Center	635mm
Front-Center Horizontal	632.6mm
Wheelbase	1063mm
Fork Offset/Rake	43mm
Trail	63.9mm mid/neutral
Mechanical Trail	60.4mm
Wheel Flop	19.7mm
Tire to Pedal Spindle	147.4mm 170 mm cranks
Pedal Spindle to Ground Clearance	92.1mm 170 mm cranks

	19 1/2
Wheel Size	26 in 559 mm BSD
Tire Width	1.5in
Tire Outer Diameter	635.2mm
Bike Length with Tires	1698.2mm

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

Off-road Touring

Source:http://forums.mtbr.com/attachments/vintage-retro-classic/71198d1113966853-specialized-rock-combo-articles-specifications-rock-combo003-copy.jpg

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1989 Specialized Bicycles Rock Combo Base

Geometry

Base Build

Stack and Reach vs. Category Trend