2019 Author Aura 55 Base

	50cm	52cm	54cm	56cm	58cm
Stack	545.5mm	565mm	585.1mm	604.3mm	623.2mm
Reach	376.7mm	379.7mm	384.3mm	388.9mm	392.8mm
Stack to Reach Ratio	1.45:1	1.49:1	1.52:1	1.55:1	1.59:1
Seat Tube Length, C-T	500mm	520mm	540mm	560mm	580mm
Seat Tube Length, C-C	460mm	480mm	500mm	520mm	540mm
Top Tube Length, Effective/Horizontal HT Top	532mm	542mm	556mm	570mm	583mm
Top Tube Length, Actual C-C	520mm	529mm	543mm	556mm	568mm
Head Tube Angle	71.8deg	72.2deg	72.5deg	72.8deg	73deg
Seat Tube Angle	74.2deg	74deg	73.7deg	73.3deg	73deg
Head Tube Length	120mm	140mm	160mm	180mm	200mm
Bottom Bracket Drop	71mm	70mm	70mm	69mm	68mm
Bottom Bracket Height	268mm	269mm	269mm	270mm	271mm
Chainstay Length	420mm	420mm	420mm	420mm	420mm
Chainstay Length Horizontal	414mm	414.1mm	414.1mm	414.3mm	414.5mm
Front-Center	584.4mm	590mm	598mm	605.7mm	613.3mm
Front-Center Horizontal	580mm	585.9mm	593.9mm	601.7mm	609.5mm
Wheelbase	994mm	1000mm	1008mm	1016mm	1024mm
Fork Offset/Rake	45mm	45mm	45mm	45mm	45mm
Fork Length (Axle-To-Crown)	377mm	377mm	377mm	377mm	377mm
Trail	64.1mm mid/neutral	61.6mm mid/neutral	59.7mm mid/neutral	57.8mm mid/neutral	56.6mm mid/neutral
Mechanical Trail	60.9mm	58.6mm	56.9mm	55.3mm	54.1mm
Wheel Flop	19mm	17.9mm	17.1mm	16.3mm	15.8mm
Tire to Pedal Spindle	73.4mm 172 mm cranks	79mm 172 mm cranks	84mm 175 mm cranks	91.7mm 175 mm cranks	99.3mm 175 mm cranks
Pedal Spindle to Ground Clearance	96mm 172 mm cranks	97mm 172 mm cranks	94mm 175 mm cranks	95mm 175 mm cranks	96mm 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://en.author.eu/road/bike-models/author-aura-55-2020-ua42929611#!geometrie-modelu

Geometry