2021 Surly Bikes Midnight Special Base with Enve Adventure Fork

	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, C-TTT	400mm	460mm	500mm	540mm	560mm	580mm	600mm	640mm
Top Tube Length, Effective/Horizontal HT Top	500mm	520mm	540mm	555mm	570mm	585mm	605mm	625mm
Top Tube Length, Actual C-C	487mm	506mm	531mm	552mm	564mm	579mm	597mm	622mm
Top Tube Slope	14.9deg	8.7deg	4.9deg	2.4deg	2.6deg	2.5deg	2.8deg	1.1deg
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	269mm	269mm	274mm	274mm	274mm	274mm	274mm	274mm
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	49mm	49mm	49mm	49mm	49mm	49mm	49mm	49mm
Fork Length (Axle-To-Crown)	398mm	398mm	398mm	398mm	398mm	398mm	398mm	398mm
Trail	64.9mm mid/neutral	61.8mm mid/neutral	58.6mm mid/neutral	55.5mm mid/neutral	52.4mm mid/neutral	52.4mm mid/neutral	49.3mm mid/neutral	46.2mm mid/neutral
Mechanical Trail	61.4mm	58.6mm	55.8mm	52.9mm	50.1mm	50.1mm	47.3mm	44.4mm
Wheel Flop	20mm	18.6mm	17.2mm	15.9mm	14.7mm	14.7mm	13.4mm	12.3mm
Standover Height	720mm	751mm	778mm	806mm	827mm	846mm	866mm	895mm
Tire to Pedal Spindle	74.1mm 165 mm cranks	70.1mm 170 mm cranks	81.6mm 170 mm cranks	87.5mm 175 mm cranks	81.6mm 175 mm cranks	96.5mm 175 mm cranks	105.4mm 175 mm cranks	119.3mm 175 mm cranks
Pedal Spindle to Ground Clearance	104mm 165 mm cranks	99mm 170 mm cranks	104mm 170 mm cranks	99mm 175 mm cranks	99mm 175 mm cranks	99mm 175 mm cranks	99mm 175 mm cranks	99mm 175 mm cranks

	40cm	46cm	50cm	54cm	56cm	58cm	60cm	64cm
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	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
Tire Width	47mm	47mm	47mm	47mm	47mm	47mm	47mm	47mm
Tire Width Max	2.35in	2.35in	2.35in	2.35in	2.35in	2.35in	2.35in	2.35in
Tire Outer Diameter	678mm	678mm	678mm	678mm	678mm	678mm	678mm	678mm
Bike Length with Tires	1671mm	1672mm	1685mm	1696mm	1690mm	1705mm	1714mm	1728mm
Crank Length	165mm	170mm	170mm	175mm	175mm	175mm	175mm	175mm
Handlebar Width	400mm	400mm	400mm	420mm	440mm	440mm	460mm	460mm
Stem Length	70mm	80mm	80mm	100mm	100mm	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

Category Trend

All-road/Gravel

Source:bikeinsights.com

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2021 Surly Bikes Midnight Special Base with Enve Adventure Fork

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