2018 Surly Bikes Lowside Base

	XS	SM	MD	LG	XL
Stack	542.2mm	560.3mm	574.4mm	588.5mm	602.5mm
Reach	414.5mm	429.3mm	445.3mm	461mm	477mm
Stack to Reach Ratio	1.31:1	1.31:1	1.29:1	1.28:1	1.26:1
Seat Tube Length, C-T	316mm	366mm	416mm	466mm	516mm
Top Tube Length, Effective/Horizontal Center	570mm	590mm	610mm	630mm	650mm
Top Tube Slope	25.4deg	21.5deg	17.3deg	13.4deg	9.8deg
Head Tube Angle	70deg	70deg	70deg	70deg	70deg
Seat Tube Angle	74deg	74deg	74deg	74deg	74deg
Head Tube Length	110mm	125mm	140mm	155mm	170mm
Bottom Bracket Drop	55mm	55mm	55mm	55mm	55mm
Bottom Bracket Height	300.7mm	300.7mm	300.7mm	300.7mm	300.7mm
Chainstay Length	425mm	425mm	425mm	425mm	425mm
Chainstay Length Horizontal	421.4mm	421.4mm	421.4mm	421.4mm	421.4mm
Front-Center	648.9mm	669.8mm	690.8mm	711.7mm	732.6mm
Front-Center Horizontal	646.6mm	667.6mm	688.6mm	709.6mm	730.6mm
Wheelbase	1068mm	1089mm	1110mm	1131mm	1152mm
Fork Offset/Rake	47mm	47mm	47mm	47mm	47mm
Fork Length (Axle-To-Crown)	420mm	420mm	420mm	420mm	420mm
Trail	79.5mm high	79.5mm high	79.5mm high	79.5mm high	79.5mm high
Mechanical Trail	74.7mm	74.7mm	74.7mm	74.7mm	74.7mm
Wheel Flop	25.5mm	25.5mm	25.5mm	25.5mm	25.5mm
Standover Height	700mm	729mm	762mm	792mm	823mm
Tire to Pedal Spindle	123.2mm 170 mm cranks	144.1mm 170 mm cranks	165.1mm 170 mm cranks	186mm 170 mm cranks	206.9mm 170 mm cranks
Pedal Spindle to Ground Clearance	130.7mm 170 mm cranks	130.7mm 170 mm cranks	130.7mm 170 mm cranks	130.7mm 170 mm cranks	130.7mm 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:https://surlybikes.com/bikes/lowside/bike_specs

Geometry