2025 Author Aura XR 4/5/6/7 Base 540
Build
700C/29 in × 38 mm
Insights
Average stack and reach vs trend of all-road/gravel bikes
Stack and Reach vs. Category Trend
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Geometry
| Stack | 601mm |
| Reach | 392mm |
| Stack to Reach Ratio | 1.53:1 |
| Seat Tube Length, C-T | 540mm |
| Top Tube Length, Effective/Horizontal HT Top | 570mm |
| Top Tube Slope | 8.7deg |
| Head Tube Angle | 71deg |
| Seat Tube Angle | 73.5deg |
| Head Tube Length | 165mm |
| Bottom Bracket Drop | 69mm |
| Bottom Bracket Height | 280mm |
| Chainstay Length | 435mm |
| Chainstay Length Horizontal | 429.5mm |
| Front-Center | 626.3mm |
| Front-Center Horizontal | 622.5mm |
| Wheelbase | 1052mm |
| Fork Offset/Rake | 45mm |
| Fork Length (Axle-To-Crown) | 408mm |
| Trail | 72.6mm high |
| Mechanical Trail | 68.6mm |
| Wheel Flop | 22.3mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 107.3mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 110mm |
Base Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 38mm |
| Tire Outer Diameter | 698mm |
| Bike Length with Tires | 1750mm |
| Suspension Type | Rigid, non-suspension corrected |
| Bar Type | Drop Bar |
| Frame Material | Aluminum |
| Fork Material | Carbon/Composite |
| Brake Type | Disc |
Source:http