2017 Surly Bikes Steamroller Base

	49cm	53cm	56cm	59cm	62cm
Stack	505mm	531mm	559mm	586mm	618mm
Reach	388mm	394mm	402mm	408mm	421mm
Stack to Reach Ratio	1.3:1	1.35:1	1.39:1	1.44:1	1.47:1
Seat Tube Length, C-TTT	490mm	530mm	560mm	590mm	620mm
Top Tube Length, Effective/Horizontal Center	529.5mm	547mm	568mm	587mm	608mm
Top Tube Slope	1.5deg	0.2deg	0.3deg	0.3deg	0.6deg
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	279mm	279mm	279mm	279mm	279mm
Chainstay Length	398mm	398mm	398mm	398mm	398mm
Chainstay Length Max	398mm	398mm	398mm	398mm	398mm
Chainstay Length Horizontal	391.8mm	391.8mm	391.8mm	391.8mm	391.8mm
Chainstay Length Horizontal Max	391.8mm	391.8mm	391.8mm	391.8mm	391.8mm
Front-Center	578.2mm	579.1mm	591mm	600.4mm	621.3mm
Front-Center Horizontal	573.9mm	574.8mm	586.8mm	596.3mm	617.3mm
Wheelbase	965.7mm	966.6mm	978.6mm	988.1mm	1009.1mm
Wheelbase Max	965.7mm	966.6mm	978.6mm	988.1mm	1009.1mm
Fork Offset/Rake	38mm	38mm	38mm	38mm	38mm
Fork Length (Axle-To-Crown)	375mm	375mm	375mm	375mm	375mm
Trail	70.2mm high	67mm high	63.8mm mid/neutral	60.5mm mid/neutral	60.5mm mid/neutral
Mechanical Trail	67mm	64mm	61.1mm	58.2mm	58.2mm
Wheel Flop	20.1mm	18.7mm	17.4mm	16mm	16mm
Standover Height	748.5mm	780.5mm	807.9mm	835.2mm	865.3mm
Tire to Pedal Spindle	59.2mm 170 mm cranks	60.1mm 170 mm cranks	72mm 170 mm cranks	81.4mm 170 mm cranks	102.3mm 170 mm cranks
Pedal Spindle to Ground Clearance	109mm 170 mm cranks	109mm 170 mm cranks	109mm 170 mm cranks	109mm 170 mm cranks	109mm 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:Bike Counterculture Geometry Database

Geometry