2021 Surly Bikes Krampus 120mm Fork

	SM	MD	LG	XL
Stack	597mm	607mm	616mm	626mm
Reach	397mm	419mm	442mm	464mm
Stack to Reach Ratio	1.5:1	1.45:1	1.39:1	1.35:1
Seat Tube Length, C-T	368mm	419mm	470mm	521mm
Top Tube Length, Effective/Horizontal HT Top	585mm	610mm	635mm	660mm
Top Tube Length, Actual C-C	556.8mm	573mm	595.1mm	621.8mm
Top Tube Slope	25.9deg	20.8deg	16.1deg	11.8deg
Head Tube Angle	68.4deg	68.4deg	68.4deg	68.4deg
Seat Tube Angle	72.4deg	72.4deg	72.4deg	72.4deg
Head Tube Length	90mm	100mm	110mm	120mm
Bottom Bracket Drop	60mm	60mm	60mm	60mm
Bottom Bracket Height	317mm	317mm	317mm	317mm
Chainstay Length	435mm	435mm	435mm	435mm
Chainstay Length Horizontal	430.8mm	430.8mm	430.8mm	430.8mm
Front-Center	667.9mm	692.8mm	718.7mm	744.6mm
Front-Center Horizontal	665.2mm	690.2mm	716.2mm	742.2mm
Wheelbase	1096mm	1121mm	1147mm	1173mm
Fork Offset/Rake	51mm	51mm	51mm	51mm
Fork Length (Axle-To-Crown)	498mm	498mm	498mm	498mm
Trail	94.4mm very high	94.4mm very high	94.4mm very high	94.4mm very high
Mechanical Trail	87.8mm	87.8mm	87.8mm	87.8mm
Wheel Flop	32.3mm	32.3mm	32.3mm	32.3mm
Standover Height	776mm	803mm	832mm	861mm
Tire to Pedal Spindle	120.8mm 170 mm cranks	140.7mm 175 mm cranks	166.6mm 175 mm cranks	192.5mm 175 mm cranks
Pedal Spindle to Ground Clearance	147mm 170 mm cranks	142mm 175 mm cranks	142mm 175 mm cranks	142mm 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.

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Source:https://surlybikes.com/bikes/krampus

Geometry