2026 Principia Evolve XOC Base

	XS	S	M	L	XL
Stack	507.6mm	526.6mm	548.8mm	571.5mm	595.3mm
Reach	359.7mm	370mm	377.8mm	385mm	393.5mm
Stack to Reach Ratio	1.41:1	1.42:1	1.45:1	1.48:1	1.51:1
Seat Tube Length, C-T	420mm	440mm	460mm	490mm	520mm
Top Tube Length, Effective/Horizontal Unknown	491mm	516mm	530mm	551mm	575.5mm
Top Tube Slope	12.3deg	11.9deg	11.9deg	11deg	10.2deg
Head Tube Angle	70.2deg	71.5deg	72deg	72.5deg	73deg
Seat Tube Angle	75.5deg	74.5deg	74.5deg	73.8deg	73deg
Head Tube Length	105mm	120mm	140mm	162mm	185mm
Bottom Bracket Drop	71mm	71mm	71mm	71mm	71mm
Bottom Bracket Height	272mm	272mm	272mm	272mm	272mm
Chainstay Length	410mm	410mm	410mm	410mm	410mm
Chainstay Length Horizontal	403.8mm	403.8mm	403.8mm	403.8mm	403.8mm
Front-Center	574.5mm	579mm	584.7mm	594.2mm	605mm
Front-Center Horizontal	570.1mm	575.2mm	580.4mm	590mm	600.9mm
Wheelbase	973.9mm	979mm	984.2mm	993.8mm	1004.7mm
Fork Offset/Rake	50mm	50mm	45mm	45mm	45mm
Fork Length, Unknown	376mm	376mm	376mm	376mm	376mm
Trail	70.4mm high	62mm mid/neutral	64.1mm mid/neutral	61mm mid/neutral	57.8mm mid/neutral
Mechanical Trail	66.2mm	58.8mm	61mm	58.1mm	55.3mm
Wheel Flop	22.4mm	18.7mm	18.9mm	17.5mm	16.2mm
Tire to Pedal Spindle	61.5mm 170 mm cranks	66mm 170 mm cranks	71.7mm 170 mm cranks	81.2mm 170 mm cranks	92mm 170 mm cranks
Pedal Spindle to Ground Clearance	102mm 170 mm cranks	102mm 170 mm cranks	102mm 170 mm cranks	102mm 170 mm cranks	102mm 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-xoc---black-pg-2597

Geometry