2025 Radon Bikes Spire Disc Carbon M
Build
700C/29 in × 28 mm
Insights
Average stack and reach vs trend of performance road bikes
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 542mm |
| Reach | 388mm |
| Stack to Reach Ratio | 1.4:1 |
| Seat Tube Length, Unknown | 510mm |
| Top Tube Length, Effective/Horizontal Unknown | 548mm |
| Top Tube Slope | 5.7deg |
| Head Tube Angle | 73deg |
| Seat Tube Angle | 73.5deg |
| Head Tube Length | 140mm |
| Bottom Bracket Drop | 69mm |
| Bottom Bracket Height | 270mm |
| Chainstay Length | 408mm |
| Chainstay Length Horizontal | 402.1mm |
| Front-Center | 583mm |
| Front-Center Horizontal | 578.9mm |
| Wheelbase | 981mm |
| Fork Offset/Rake | 44.2mm |
| Trail | 57.4mm mid/neutral |
| Mechanical Trail | 54.9mm |
| Wheel Flop | 16mm |
| Standover Height | 787mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 74mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 100mm |
Disc Carbon Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 28mm |
| Tire Outer Diameter | 678mm |
| Bike Length with Tires | 1659mm |
| Suspension Type | Rigid, non-suspension corrected |
| Bar Type | Drop Bar |
| Frame Material | Carbon/Composite |
| Fork Material | Carbon/Composite |
| Brake Type | Disc |
Source:https://www.radon-bikes.de/roadbike-gravel/carbon/