2019 Surly Bikes Troll Base

	XS	S	M	L	XL
Stack	551mm	561mm	570mm	585mm	604mm
Reach	371mm	393mm	415mm	431mm	446mm
Stack to Reach Ratio	1.49:1	1.43:1	1.37:1	1.36:1	1.35:1
Seat Tube Length, C-T	336mm	406mm	457mm	508mm	559mm
Top Tube Length, Effective/Horizontal Center	545mm	570mm	595mm	615mm	630mm
Top Tube Length, Actual C-C	530.6mm	546.7mm	568.1mm	589mm	608.6mm
Top Tube Slope	27.8deg	21.4deg	17deg	13.9deg	8.9deg
Head Tube Angle	71deg	71deg	71deg	71deg	71deg
Seat Tube Angle	73deg	73deg	73deg	73deg	73deg
Head Tube Length	125mm	135mm	145mm	160mm	180mm
Bottom Bracket Drop	40mm	40mm	40mm	40mm	40mm
Bottom Bracket Height	303mm	303mm	303mm	303mm	303mm
Chainstay Length	425mm	425mm	425mm	425mm	425mm
Chainstay Length Horizontal	423.1mm	423.1mm	423.1mm	423.1mm	423.1mm
Front-Center	594.2mm	619.2mm	644.1mm	664.1mm	686.1mm
Front-Center Horizontal	592.9mm	617.9mm	642.9mm	662.9mm	684.9mm
Wheelbase	1016mm	1041mm	1066mm	1086mm	1108mm
Fork Offset/Rake	43mm	43mm	43mm	43mm	43mm
Fork Length (Axle-To-Crown)	420mm	420mm	420mm	420mm	420mm
Trail	72.6mm high	72.6mm high	72.6mm high	72.6mm high	72.6mm high
Mechanical Trail	68.7mm	68.7mm	68.7mm	68.7mm	68.7mm
Wheel Flop	22.4mm	22.4mm	22.4mm	22.4mm	22.4mm
Standover Height	720mm	749mm	778mm	809mm	843mm
Tire to Pedal Spindle	81.2mm 170 mm cranks	106.2mm 170 mm cranks	126.1mm 175 mm cranks	146.1mm 175 mm cranks	168.1mm 175 mm cranks
Pedal Spindle to Ground Clearance	133mm 170 mm cranks	133mm 170 mm cranks	128mm 175 mm cranks	128mm 175 mm cranks	128mm 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/

Geometry