2026 Principia Evolve XO Base

	XS/52cm	S/54cm	M/56cm	L/58cm	XL/60cm
Stack	506.3mm	533.4mm	560.6mm	576.7mm	607.2mm
Reach	379.8mm	392mm	388.6mm	398.7mm	404.4mm
Stack to Reach Ratio	1.33:1	1.36:1	1.44:1	1.45:1	1.5:1
Seat Tube Length, C-T	520mm	540mm	560mm	580mm	600mm
Top Tube Length, Effective/Horizontal Center	525mm	545mm	560mm	575mm	590mm
Top Tube Slope	0.7deg	1.5deg	2.6deg	2.2deg	3.3deg
Head Tube Angle	70deg	71deg	72deg	72.5deg	73deg
Seat Tube Angle	74deg	74deg	73deg	73deg	73deg
Head Tube Length	100mm	125mm	150mm	165mm	195mm
Bottom Bracket Drop	80mm	80mm	80mm	80mm	80mm
Bottom Bracket Height	263mm	263mm	263mm	263mm	263mm
Chainstay Length	420mm	420mm	420mm	420mm	420mm
Chainstay Length Horizontal	412.3mm	412.3mm	412.3mm	412.3mm	412.3mm
Front-Center	587mm	601.1mm	597.5mm	607.8mm	607.8mm
Front-Center Horizontal	588mm	600.9mm	592.1mm	607.6mm	607.6mm
Wheelbase	1000.3mm	1013.2mm	1004.4mm	1019.9mm	1019.9mm
Fork Offset/Rake	45mm	45mm	45mm	45mm	45mm
Fork Length, Unknown	370mm	370mm	370mm	370mm	370mm
Trail	77mm high	70.5mm high	64.1mm mid/neutral	61mm mid/neutral	57.8mm mid/neutral
Mechanical Trail	72.3mm	66.7mm	61mm	58.1mm	55.3mm
Wheel Flop	24.7mm	21.7mm	18.9mm	17.5mm	16.2mm
Tire to Pedal Spindle	74mm 170 mm cranks	88.1mm 170 mm cranks	84.5mm 170 mm cranks	94.8mm 170 mm cranks	94.8mm 170 mm cranks
Pedal Spindle to Ground Clearance	93mm 170 mm cranks	93mm 170 mm cranks	93mm 170 mm cranks	93mm 170 mm cranks	93mm 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://principiabikes.com/road/all-road/evolve-xo---grey-pg-2599

Geometry