2025 Author Guru Base 540
Build
700C/29 in × 38 mm
Insights
Somewhat aggressive stack and reach vs trend of all-road/gravel bikes
Stack and Reach vs. Category Trend
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Geometry
| Stack | 603mm |
| Reach | 406mm |
| Stack to Reach Ratio | 1.49:1 |
| Seat Tube Length, C-T | 540mm |
| Top Tube Length, Effective/Horizontal HT Top | 585mm |
| Top Tube Slope | 8.7deg |
| Head Tube Angle | 71deg |
| Seat Tube Angle | 73.5deg |
| Head Tube Length | 170mm |
| Bottom Bracket Drop | 74mm |
| Bottom Bracket Height | 275mm |
| Chainstay Length | 435mm |
| Chainstay Length Horizontal | 428.7mm |
| Front-Center | 644.6mm |
| Front-Center Horizontal | 640.3mm |
| Wheelbase | 1069mm |
| Fork Offset/Rake | 47.9mm |
| Fork Length (Axle-To-Crown) | 408mm |
| Trail | 69.5mm high |
| Mechanical Trail | 65.7mm |
| Wheel Flop | 21.4mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 125.6mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 105mm |
Base Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 38mm |
| Tire Outer Diameter | 698mm |
| Bike Length with Tires | 1767mm |
| Suspension Type | Rigid, non-suspension corrected |
| Bar Type | Drop Bar |
| Frame Material | Carbon/Composite |
| Fork Material | Carbon/Composite |
| Brake Type | Disc |
Source:http