2021 Norco Bicycles Optic Carbon Frame

	S	M	L	XL
Stack	611mm	620mm	629mm	638mm
Reach	420mm	450mm	480mm	510mm
Stack to Reach Ratio	1.45:1	1.38:1	1.31:1	1.25:1
Seat Tube Length, C-T	395mm	415mm	445mm	485mm
Top Tube Length, Effective/Horizontal Center	572mm	605mm	637mm	669mm
Top Tube Slope	23.8deg	21.6deg	18.6deg	14.9deg
Head Tube Angle	65deg	65deg	65deg	65deg
Seat Tube Angle	76deg	76deg	76deg	76deg
Head Tube Length	100mm	110mm	120mm	130mm
Bottom Bracket Drop	38mm	38mm	38mm	38mm
Bottom Bracket Height	334mm	334mm	334mm	334mm
Chainstay Length	425mm	430mm	435mm	440mm
Chainstay Length Horizontal	423.3mm	428.3mm	433.3mm	438.4mm
Front-Center	734.7mm	768.6mm	802.6mm	837.5mm
Front-Center Horizontal	733.7mm	767.7mm	801.7mm	836.6mm
Wheelbase	1157mm	1196mm	1235mm	1275mm
Fork Offset/Rake	42mm	42mm	42mm	42mm
Trail	127.1mm very high	127.1mm very high	127.1mm very high	127.1mm very high
Mechanical Trail	115.2mm	115.2mm	115.2mm	115.2mm
Wheel Flop	48.7mm	48.7mm	48.7mm	48.7mm
Standover Height	664mm	680mm	698mm	719mm
Tire to Pedal Spindle	192.7mm 170 mm cranks	226.7mm 170 mm cranks	260.6mm 170 mm cranks	295.6mm 170 mm cranks
Pedal Spindle to Ground Clearance	164mm 170 mm cranks	164mm 170 mm cranks	164mm 170 mm cranks	164mm 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:https://www.norco.com/bikes/2021/mountain/trail/optic/optic-c3/

Geometry