2024 Surly Bikes Midnight Special Base

	40cm	46cm	50cm	54cm	56cm	58cm	60cm	64cm
Stack	531mm	538mm	544mm	560mm	580mm	599mm	620mm	641mm
Reach	363mm	366mm	379mm	389mm	393mm	402mm	409mm	423mm
Stack to Reach Ratio	1.46:1	1.47:1	1.44:1	1.44:1	1.48:1	1.49:1	1.52:1	1.52:1
Seat Tube Length, Unknown	400mm	460mm	500mm	540mm	560mm	580mm	600mm	640mm
Top Tube Length, Actual C-C	487mm	506mm	531mm	552mm	564mm	579mm	597mm	622mm
Top Tube Slope	17.2deg	11deg	7.1deg	4.5deg	4.6deg	4.4deg	4.6deg	2.9deg
Head Tube Angle	71deg	71.5deg	72deg	72.5deg	73deg	73deg	73.5deg	74deg
Seat Tube Angle	75.5deg	74deg	73.5deg	73.5deg	73deg	73deg	72.5deg	72.5deg
Head Tube Length	95mm	100mm	110mm	125mm	140mm	160mm	180mm	200mm
Bottom Bracket Drop	70mm	70mm	65mm	65mm	65mm	65mm	65mm	65mm
Bottom Bracket Height	279mm	279mm	284mm	284mm	284mm	284mm	284mm	284mm
Chainstay Length	425mm	425mm	425mm	425mm	425mm	425mm	425mm	425mm
Chainstay Length Horizontal	419.2mm	419.2mm	420mm	420mm	420mm	420mm	420mm	420mm
Front-Center	578.1mm	579.1mm	590.6mm	601.5mm	595.6mm	610.5mm	619.4mm	633.3mm
Front-Center Horizontal	573.8mm	574.8mm	587mm	598mm	592mm	607mm	616mm	630mm
Wheelbase	993mm	994mm	1007mm	1018mm	1012mm	1027mm	1036mm	1050mm
Fork Offset/Rake	50mm	50mm	50mm	50mm	40mm	40mm	40mm	40mm
Fork Length (On-Axis)	400mm	400mm	400mm	400mm	400mm	400mm	400mm	400mm
Trail	67.3mm high	64.1mm mid/neutral	60.8mm mid/neutral	57.6mm mid/neutral	64.9mm mid/neutral	64.9mm mid/neutral	61.7mm mid/neutral	58.5mm mid/neutral
Mechanical Trail	63.6mm	60.7mm	57.9mm	55mm	62mm	62mm	59.1mm	56.2mm
Wheel Flop	20.7mm	19.3mm	17.9mm	16.5mm	18.1mm	18.1mm	16.8mm	15.5mm
Standover Height	720mm	751mm	778mm	806mm	827mm	846mm	866mm	895mm
Tire to Pedal Spindle	64.1mm 165 mm cranks	60.1mm 170 mm cranks	71.6mm 170 mm cranks	77.5mm 175 mm cranks	71.6mm 175 mm cranks	86.5mm 175 mm cranks	95.4mm 175 mm cranks	109.3mm 175 mm cranks
Pedal Spindle to Ground Clearance	114mm 165 mm cranks	109mm 170 mm cranks	114mm 170 mm cranks	109mm 175 mm cranks	109mm 175 mm cranks	109mm 175 mm cranks	109mm 175 mm cranks	109mm 175 mm cranks

	40cm	46cm	50cm	54cm	56cm	58cm	60cm	64cm
Wheel Size	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	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	38mm	38mm	38mm	38mm	38mm	38mm	38mm	38mm
Tire Outer Diameter	698mm	698mm	698mm	698mm	698mm	698mm	698mm	698mm
Bike Length with Tires	1691mm	1692mm	1705mm	1716mm	1710mm	1725mm	1734mm	1748mm
Crank Length	165mm	170mm	170mm	175mm	175mm	175mm	175mm	175mm
Handlebar Width	400mm	400mm	400mm	420mm	440mm	440mm	460mm	460mm
Stem Length	70mm	7080mm	7080mm	100120mm	100120mm	120mm	120mm	120mm
Stem Angle	6deg	6deg	6deg	6deg	6deg	6deg	6deg	6deg

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

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

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2024 Surly Bikes Midnight Special Base

Geometry

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Stack and Reach vs. Category Trend