Name: 2025 Rock Machine Lukk Cr 80 Base
Brand: Rock Machine

	S	M	L	XL
Stack	554mm	567mm	582mm	600mm
Reach	366mm	372mm	378mm	386mm
Stack to Reach Ratio	1.51:1	1.52:1	1.54:1	1.55:1
Seat Tube Length, Unknown	500mm	520mm	540mm	560mm
Top Tube Length, Effective/Horizontal Unknown	520mm	535mm	550mm	564mm
Top Tube Slope	8.2deg	7.4deg	6.9deg	6.6deg
Head Tube Angle	70deg	70.5deg	71deg	71deg
Seat Tube Angle	74.5deg	74deg	73.5deg	73.5deg
Head Tube Length	135mm	147mm	159mm	178mm
Bottom Bracket Drop	72mm	72mm	72mm	72mm
Bottom Bracket Height	281mm	281mm	281mm	281mm
Chainstay Length	424mm	424mm	424mm	424mm
Chainstay Length Horizontal	417.8mm	417.8mm	417.8mm	417.8mm
Front-Center	605.5mm	610.4mm	616.4mm	630.3mm
Front-Center Horizontal	601.2mm	606.2mm	612.2mm	626.2mm
Wheelbase	1019mm	1024mm	1030mm	1044mm
Fork Offset/Rake	56.1mm	55.5mm	55.4mm	55.2mm
Trail	68.8mm high	66.1mm high	63mm mid/neutral	63.2mm mid/neutral
Mechanical Trail	64.6mm	62.3mm	59.6mm	59.8mm
Wheel Flop	22.1mm	20.8mm	19.4mm	19.5mm
Tire to Pedal Spindle	82.5mm 170 mm cranks	87.4mm 170 mm cranks	93.4mm 170 mm cranks	107.3mm 170 mm cranks
Pedal Spindle to Ground Clearance	111mm 170 mm cranks	111mm 170 mm cranks	111mm 170 mm cranks	111mm 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.

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2025 Rock Machine Lukk Cr 80 Base

Geometry