Name: 2026 Surly Bikes Big Dummy Base
Brand: Surly Bikes

	Small	Medium	Large
Stack	571mm	599mm	627mm
Reach	410mm	431mm	447mm
Stack to Reach Ratio	1.39:1	1.39:1	1.4:1
Seat Tube Length, C-T	406mm	432mm	508mm
Top Tube Length, Effective/Horizontal HT Top	590mm	620mm	645mm
Top Tube Slope	19.1deg	18.4deg	13.4deg
Head Tube Angle	70deg	70deg	70deg
Seat Tube Angle	72.5deg	72.5deg	72.5deg
Head Tube Length	150mm	180mm	210mm
Bottom Bracket Drop	40mm	40mm	40mm
Bottom Bracket Height	303mm	303mm	303mm
Chainstay Length	821mm	821mm	821mm
Chainstay Length Horizontal	820mm	820mm	820mm
Front-Center	650.2mm	681.2mm	708.1mm
Front-Center Horizontal	649mm	680mm	707mm
Wheelbase	1469mm	1500mm	1527mm
Fork Offset/Rake	43mm	43mm	43mm
Fork Length, Unknown	418mm	418mm	418mm
Trail	79.1mm high	79.1mm high	79.1mm high
Mechanical Trail	74.3mm	74.3mm	74.3mm
Wheel Flop	25.4mm	25.4mm	25.4mm
Standover Height	725mm	773mm	823mm
Tire to Pedal Spindle	142.2mm 165 mm cranks	168.2mm 170 mm cranks	195.1mm 170 mm cranks
Pedal Spindle to Ground Clearance	138mm 165 mm cranks	133mm 170 mm cranks	133mm 170 mm cranks