2021 Surly Bikes Ogre Base

	SM	MD	LG	XL
Stack	592mm	603.4mm	613mm	632mm
Reach	395.5mm	410.5mm	427.6mm	447mm
Stack to Reach Ratio	1.5:1	1.47:1	1.43:1	1.41:1
Seat Tube Length, C-T	406.4mm	457.2mm	508mm	558mm
Top Tube Length, Effective/Horizontal Center	575mm	595mm	615mm	640mm
Top Tube Slope	21.6deg	17deg	12.5deg	9.2deg
Head Tube Angle	71.5deg	72deg	72deg	72deg
Seat Tube Angle	73deg	73deg	73deg	73deg
Head Tube Length	110mm	120mm	130mm	150mm
Bottom Bracket Drop	68mm	68mm	68mm	68mm
Bottom Bracket Height	306.5mm	306.5mm	306.5mm	306.5mm
Chainstay Length	440mm	440mm	440mm	440mm
Chainstay Length Horizontal	434.7mm	434.7mm	434.7mm	434.7mm
Front-Center	618.4mm	633.5mm	653.4mm	678.7mm
Front-Center Horizontal	614.7mm	629.8mm	649.9mm	675.3mm
Wheelbase	1049.4mm	1064.5mm	1084.6mm	1110mm
Fork Offset/Rake	43mm	43mm	43mm	43mm
Fork Length (Axle-To-Crown)	447mm	447mm	447mm	447mm
Trail	80mm high	76.5mm high	76.5mm high	76.5mm high
Mechanical Trail	75.8mm	72.7mm	72.7mm	72.7mm
Wheel Flop	24.1mm	22.5mm	22.5mm	22.5mm
Standover Height	763.5mm	795.7mm	824.5mm	857.9mm
Tire to Pedal Spindle	73.9mm 170 mm cranks	84mm 175 mm cranks	103.9mm 175 mm cranks	129.2mm 175 mm cranks
Pedal Spindle to Ground Clearance	136.5mm 170 mm cranks	131.5mm 175 mm cranks	131.5mm 175 mm cranks	131.5mm 175 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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Source:https://surlybikes.com/bikes/ogre

Geometry