2025 Surly Bikes Lowside 27.5+ Rigid Fork

	X-Small	Small	Medium	Large	X-Large
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 HT Top	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	239.8mm	239.8mm	239.8mm	239.8mm	239.8mm
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
Trail	57.3mm mid/neutral	57.3mm mid/neutral	57.3mm mid/neutral	57.3mm mid/neutral	57.3mm mid/neutral
Mechanical Trail	53.8mm	53.8mm	53.8mm	53.8mm	53.8mm
Wheel Flop	18.4mm	18.4mm	18.4mm	18.4mm	18.4mm
Standover Height	700mm	729mm	762mm	792mm	823mm
Tire to Pedal Spindle	184.1mm 170 mm cranks	205mm 170 mm cranks	221mm 175 mm cranks	241.9mm 175 mm cranks	262.8mm 175 mm cranks
Pedal Spindle to Ground Clearance	69.8mm 170 mm cranks	69.8mm 170 mm cranks	64.8mm 175 mm cranks	64.8mm 175 mm cranks	64.8mm 175 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/products/lowside-dream-tangerine

Geometry