2023 Surly Bikes Preamble Flat Bar

	XS	XS	SM	SM	MD	MD	LG	LG	XL	XL
Stack	517mm	517mm	535mm	535mm	567mm	567mm	605mm	605mm	643mm	643mm
Reach	352mm	352mm	381mm	381mm	391mm	391mm	404mm	404mm	421mm	421mm
Stack to Reach Ratio	1.47:1	1.47:1	1.4:1	1.4:1	1.45:1	1.45:1	1.5:1	1.5:1	1.53:1	1.53:1
Seat Tube Length, Unknown	410mm	410mm	505mm	505mm	565mm	565mm	605mm	605mm	645mm	645mm
Top Tube Length, Actual C-C	500mm	500mm	545mm	545mm	570mm	570mm	600mm	600mm	630mm	630mm
Top Tube Slope	14.8deg	14.8deg	5.6deg	5.6deg	2.9deg	2.9deg	2.9deg	2.9deg	2.7deg	2.7deg
Head Tube Angle	70deg	70deg	71deg	71deg	72deg	72deg	72deg	72deg	72deg	72deg
Seat Tube Angle	74deg	74deg	73deg	73deg	72.5deg	72.5deg	72deg	72deg	72deg	72deg
Head Tube Length	120mm	120mm	135mm	135mm	130mm	130mm	170mm	170mm	210mm	210mm
Bottom Bracket Drop	54mm	54mm	54mm	54mm	66mm	66mm	66mm	66mm	66mm	66mm
Bottom Bracket Height	272.3mm	272.3mm	272.3mm	272.3mm	280mm	280mm	280mm	280mm	280mm	280mm
Chainstay Length	420mm	420mm	420mm	420mm	435mm	435mm	435mm	435mm	435mm	435mm
Chainstay Length Horizontal	416.5mm	416.5mm	416.5mm	416.5mm	430mm	430mm	430mm	430mm	430mm	430mm
Front-Center	573mm	573mm	598.9mm	598.9mm	603.7mm	603.7mm	628.5mm	628.5mm	658.4mm	658.4mm
Front-Center Horizontal	570.5mm	570.5mm	596.5mm	596.5mm	600mm	600mm	625mm	625mm	655mm	655mm
Wheelbase	987mm	987mm	1013mm	1013mm	1030mm	1030mm	1055mm	1055mm	1085mm	1085mm
Fork Offset/Rake	47mm	47mm	47mm	47mm	44mm	44mm	44mm	44mm	44mm	44mm
Fork Length (On-Axis)	380mm	380mm	380mm	380mm	400mm	400mm	400mm	400mm	400mm	400mm
Trail	68.7mm high	68.7mm high	62.6mm mid/neutral	62.6mm mid/neutral	66.2mm high	66.2mm high	66.2mm high	66.2mm high	66.2mm high	66.2mm high
Mechanical Trail	64.6mm	64.6mm	59.2mm	59.2mm	62.9mm	62.9mm	62.9mm	62.9mm	62.9mm	62.9mm
Wheel Flop	22.1mm	22.1mm	19.3mm	19.3mm	19.4mm	19.4mm	19.4mm	19.4mm	19.4mm	19.4mm
Standover Height	722mm	722mm	776mm	776mm	826mm	826mm	863mm	863mm	901mm	901mm
Tire to Pedal Spindle	81.8mm 165 mm cranks	81.8mm 165 mm cranks	102.6mm 170 mm cranks	102.6mm 170 mm cranks	87.7mm 170 mm cranks	87.7mm 170 mm cranks	107.5mm 175 mm cranks	107.5mm 175 mm cranks	137.4mm 175 mm cranks	137.4mm 175 mm cranks
Pedal Spindle to Ground Clearance	107.3mm 165 mm cranks	107.3mm 165 mm cranks	102.3mm 170 mm cranks	102.3mm 170 mm cranks	110mm 170 mm cranks	110mm 170 mm cranks	105mm 175 mm cranks	105mm 175 mm cranks	105mm 175 mm cranks	105mm 175 mm cranks

	XS	XS	SM	SM	MD	MD	LG	LG	XL	XL
Wheel Size	650B/27.5 in 584 mm BSD	650B/27.5 in 584 mm BSD	650B/27.5 in 584 mm BSD	650B/27.5 in 584 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	1.35in	1.35in	1.35in	1.35in	35mm	35mm	35mm	35mm	35mm	35mm
Tire Outer Diameter	652.6mm	652.6mm	652.6mm	652.6mm	692mm	692mm	692mm	692mm	692mm	692mm
Bike Length with Tires	1639.6mm	1639.6mm	1665.6mm	1665.6mm	1722mm	1722mm	1747mm	1747mm	1777mm	1777mm
Crank Length	165mm	165mm	170mm	170mm	170mm	170mm	175mm	175mm	175mm	175mm
Handlebar Width	380mm	380mm	400mm	400mm	420mm	420mm	440mm	440mm	460mm	460mm
Stem Length	80mm	80mm	80mm	80mm	90mm	90mm	100mm	100mm	100mm	100mm
Stem Angle	7deg	7deg	7deg	7deg	7deg	7deg	7deg	7deg	7deg	7deg

Published Sizing Recommendations

Height

127 ft 0 in

135 ft 5.599999999999909 in

141 ft 9.799999999999955 in

150 ft 3.400000000000091 in

156 ft 7.599999999999909 in

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.

Learn more about the Upright/Aggressive Scale

Category Trend

Commuter

Source:https://surlybikes.com/bikes/preamble

Suggest Bike Edit

2023 Surly Bikes Preamble Flat Bar

Geometry

Flat Bar Build

Published Sizing Recommendations

Stack and Reach vs. Category Trend