2019 Author Aura 55 Base

Design
Drop Bar, Rigid, non-suspension corrected
Frame
Aluminum
Fork
Carbon/Composite
Features
Rim brake
Somewhat upright stack and reachvs category
Somewhat upright stack and reachvs category
Somewhat upright stack and reachvs category
Somewhat upright stack and reachvs category
Somewhat upright stack and reachvs category

Geometry

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

Base Build

50cm
52cm
54cm
56cm
58cm
Wheel Size
700C/29"
622 mm BSD
700C/29"
622 mm BSD
700C/29"
622 mm BSD
700C/29"
622 mm BSD
700C/29"
622 mm BSD
Tire Width
28mm
28mm
28mm
28mm
28mm
Tire Outer Diameter
678mm
678mm
678mm
678mm
678mm
Bike Length with Tires
1672mm
1678mm
1686mm
1694mm
1702mm
Crank Length
172mm
172mm
175mm
175mm
175mm
Handlebar Width
420mm
420mm
440mm
440mm
440mm
Stem Length
90mm
100mm
110mm
110mm
120mm

Stack and Reach vs. Category Trend

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.

Learn more about the Upright/Aggressive Scale
Category Trend
Performance Road
Source:https://en.author.eu/road/bike-models/author-aura-55-2020-ua42929611#!geometrie-modelu