2025 Calibre Bikes Bossnut Base XS
Build
650B/27.5 in × 2.4 in
Insights
Average stack and reach vs trend of full-suspension trail mtb bikes
Design deviates from other sizes of Calibre Bikes Bossnut
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 596mm |
| Reach | 420mm |
| Stack to Reach Ratio | 1.42:1 |
| Seat Tube Length, Unknown | 390mm |
| Top Tube Length, Effective/Horizontal Unknown | 547mm |
| Top Tube Slope | 23.2deg |
| Head Tube Angle | 64.5deg |
| Seat Tube Angle | 78deg |
| Effective Seat Tube Angle, ETT HT Top | 72deg |
| Head Tube Length | 110mm |
| Bottom Bracket Drop | 28mm |
| Bottom Bracket Height | 325mm |
| Chainstay Length | 425mm |
| Chainstay Length Horizontal | 424.1mm |
| Front-Center | 732.5mm |
| Front-Center Horizontal | 731.9mm |
| Wheelbase | 1156mm |
| Fork Offset/Rake | 42mm |
| Fork Length, Unknown | 140mm |
| Trail | 121.8mm very high |
| Mechanical Trail | 110mm |
| Wheel Flop | 47.3mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 209.5mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 155mm |
Base Build
| Wheel Size | 650B, 27.5 inch (584mm BSD) |
| Tire Width | 2.4in |
| Tire Outer Diameter | 705.9mm |
| Bike Length with Tires | 1861.9mm |
| Crank Length | 170mm |
| Handlebar Width | 780mm |
| Suspension Type | Full suspension |
| Bar Type | Flat Bar |
| Fork Travel | 140mm |
| Rear Travel | 135mm |
| Suspension Sag | Unknown |
| Frame Material | Aluminum |
| Fork Material | Unknown |
| Brake Type | Disc |
Published Sizing Recommendations
| Height | 5 ft 6 in to 5 ft 9 in |
Source:https://www.pinkbike.com/news/review-calibre-bossnut-2025.html#geometry