2025 Author Aura XR 4/5/6/7 Base

	480	500	520	540	560	580
Stack	562mm	572mm	588mm	601mm	617mm	638mm
Reach	364mm	371mm	381mm	392mm	402mm	409mm
Stack to Reach Ratio	1.54:1	1.54:1	1.54:1	1.53:1	1.53:1	1.56:1
Seat Tube Length, C-T	480mm	500mm	520mm	540mm	560mm	580mm
Top Tube Length, Effective/Horizontal HT Top	520mm	530mm	550mm	570mm	590mm	610mm
Top Tube Slope	11.4deg	10.1deg	9.5deg	8.7deg	8.2deg	8.3deg
Head Tube Angle	70deg	70.5deg	71deg	71deg	71.5deg	72deg
Seat Tube Angle	74.5deg	74.5deg	74deg	73.5deg	73deg	72.5deg
Head Tube Length	125mm	135mm	150mm	165mm	180mm	200mm
Bottom Bracket Drop	71mm	70mm	70mm	69mm	68mm	68mm
Bottom Bracket Height	278mm	279mm	279mm	280mm	281mm	281mm
Chainstay Length	435mm	435mm	435mm	435mm	435mm	435mm
Chainstay Length Horizontal	429.2mm	429.3mm	429.3mm	429.5mm	429.7mm	429.7mm
Front-Center	595.1mm	600.8mm	611.7mm	626.3mm	636mm	644.9mm
Front-Center Horizontal	590.8mm	596.7mm	607.7mm	622.5mm	632.4mm	641.4mm
Wheelbase	1020mm	1026mm	1037mm	1052mm	1062mm	1071mm
Fork Offset/Rake	45mm	45mm	45mm	45mm	45mm	45mm
Fork Length (Axle-To-Crown)	408mm	408mm	408mm	408mm	408mm	408mm
Trail	79.1mm high	75.9mm high	72.6mm high	72.6mm high	69.3mm high	66.1mm high
Mechanical Trail	74.4mm	71.5mm	68.6mm	68.6mm	65.7mm	62.9mm
Wheel Flop	25.4mm	23.9mm	22.3mm	22.3mm	20.9mm	19.4mm
Tire to Pedal Spindle	76.1mm 170 mm cranks	81.8mm 170 mm cranks	92.7mm 170 mm cranks	107.3mm 170 mm cranks	117mm 170 mm cranks	125.9mm 170 mm cranks
Pedal Spindle to Ground Clearance	108mm 170 mm cranks	109mm 170 mm cranks	109mm 170 mm cranks	110mm 170 mm cranks	111mm 170 mm cranks	111mm 170 mm cranks

	480	500	520	540	560	580
Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	38mm	38mm	38mm	38mm	38mm	38mm
Tire Outer Diameter	698mm	698mm	698mm	698mm	698mm	698mm
Bike Length with Tires	1718mm	1724mm	1735mm	1750mm	1760mm	1769mm

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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Geometry