2017 Aventon Bikes Ultro Base

	X-Small (fits like 49cm)	Small (fits like 52cm)	Medium (fits like 55cm)	Large (fits like 58cm)	X-Large (fits like 61cm)
Stack	502mm	523mm	539mm	558mm	576mm
Reach	385mm	392mm	395mm	400mm	404mm
Stack to Reach Ratio	1.3:1	1.33:1	1.36:1	1.4:1	1.43:1
Seat Tube Length, C-T	465mm	490mm	510mm	530mm	550mm
Top Tube Length, Effective/Horizontal Center	515mm	533mm	545mm	554mm	561mm
Top Tube Slope	5.9deg	5.5deg	5.1deg	5deg	5deg
Head Tube Angle	72deg	72.5deg	73deg	73deg	73deg
Seat Tube Angle	75.5deg	75deg	74.5deg	74.5deg	73.5deg
Head Tube Length	113mm	133mm	148mm	168mm	186mm
Bottom Bracket Drop	56mm	56mm	56mm	56mm	56mm
Bottom Bracket Height	278mm	278mm	278mm	278mm	278mm
Chainstay Length	388mm	388mm	390mm	390mm	393mm
Chainstay Length Horizontal	383.9mm	383.9mm	386mm	386mm	389mm
Front-Center	569.8mm	579.8mm	581.7mm	592.7mm	601.6mm
Front-Center Horizontal	567.1mm	577.1mm	579mm	590mm	599mm
Wheelbase	951mm	961mm	965mm	976mm	988mm
Fork Offset/Rake	35mm	35mm	35mm	35mm	35mm
Trail	71.7mm high	68.6mm high	65.5mm high	65.5mm high	65.5mm high
Mechanical Trail	68.2mm	65.4mm	62.7mm	62.7mm	62.7mm
Wheel Flop	21.1mm	19.7mm	18.3mm	18.3mm	18.3mm
Standover Height	749mm	770mm	789mm	807mm	825mm
Tire to Pedal Spindle	65.8mm 170 mm cranks	75.8mm 170 mm cranks	77.7mm 170 mm cranks	88.7mm 170 mm cranks	97.6mm 170 mm cranks
Pedal Spindle to Ground Clearance	108mm 170 mm cranks	108mm 170 mm cranks	108mm 170 mm cranks	108mm 170 mm cranks	108mm 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://sandiegocyclery.com/shop/fixed-gear/track-frames-forks/aventon-frames/aventon-ultro/

Geometry