2020 Surly Bikes Steamroller Base

	49cm	53cm	56cm	59cm	62cm
Stack	504.9mm	531.3mm	558.8mm	586.4mm	618.1mm
Reach	388.1mm	394mm	402.3mm	408.2mm	420.6mm
Stack to Reach Ratio	1.3:1	1.35:1	1.39:1	1.44:1	1.47:1
Seat Tube Length, Unknown	490mm	530mm	560mm	590mm	620mm
Top Tube Length, Effective/Horizontal Center	529.5mm	547mm	568mm	587mm	608mm
Top Tube Length, Actual C-C	526.5mm	547mm	568mm	587mm	608mm
Top Tube Slope	1.2deg	0deg	0deg	0deg	0deg
Head Tube Angle	72.5deg	73deg	73.5deg	74deg	74deg
Seat Tube Angle	74.5deg	74deg	73.5deg	73deg	73deg
Head Tube Length	83mm	109mm	136mm	163mm	196mm
Bottom Bracket Drop	70mm	70mm	70mm	70mm	70mm
Bottom Bracket Height	271mm	271mm	271mm	271mm	271mm
Chainstay Length	398mm	398mm	398mm	398mm	398mm
Chainstay Length Horizontal	391.8mm	391.8mm	391.8mm	391.8mm	391.8mm
Front-Center	569.3mm	579mm	591mm	599.8mm	621.3mm
Front-Center Horizontal	565mm	574.7mm	586.8mm	595.7mm	617.3mm
Wheelbase	956.8mm	966.5mm	978.6mm	987.5mm	1009.1mm
Fork Offset/Rake	38mm	38mm	38mm	38mm	38mm
Fork Length (Axle-To-Crown)	375mm	375mm	375mm	375mm	375mm
Trail	67.7mm high	64.5mm mid/neutral	61.4mm mid/neutral	58.3mm mid/neutral	58.3mm mid/neutral
Mechanical Trail	64.5mm	61.7mm	58.9mm	56mm	56mm
Wheel Flop	19.4mm	18mm	16.7mm	15.4mm	15.4mm
Standover Height	748.5mm	780.5mm	807.9mm	835.2mm	865.3mm
Tire to Pedal Spindle	58.3mm 170 mm cranks	68mm 170 mm cranks	80mm 170 mm cranks	88.8mm 170 mm cranks	110.3mm 170 mm cranks
Pedal Spindle to Ground Clearance	101mm 170 mm cranks	101mm 170 mm cranks	101mm 170 mm cranks	101mm 170 mm cranks	101mm 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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Source:https://surlybikes.com/bikes/steamroller

Geometry