2017 Bird Bikes Zero TR Base XL
Build
650B/27.5 in × 2.4 in
Insights
Somewhat aggressive stack and reach vs trend of hardtail trail mtb bikes
Design deviates from other sizes of Bird Bikes Zero TR
Suspension sag unknown
Geometry may mis-represent actual riding geometry
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 628mm |
| Reach | 495mm |
| Stack to Reach Ratio | 1.27:1 |
| Seat Tube Length, Unknown | 500mm |
| Top Tube Length, Effective/Horizontal Unknown | 675mm |
| Top Tube Slope | 13.1deg |
| Head Tube Angle | 66.2deg |
| Seat Tube Angle | 74deg |
| Head Tube Length | 130mm |
| Bottom Bracket Drop | 58mm |
| Bottom Bracket Height | 295mm |
| Chainstay Length | 440mm |
| Chainstay Length Horizontal | 436.2mm |
| Front-Center | 803.9mm |
| Front-Center Horizontal | 801.8mm |
| Wheelbase | 1238mm |
| Fork Offset/Rake | 42mm |
| Fork Length, Unknown | 522mm |
| Trail | 109.8mm very high |
| Mechanical Trail | 100.4mm |
| Wheel Flop | 40.5mm |
| Standover Height | 738mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 281mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 125mm |
Base Build
| Wheel Size | 650B, 27.5 inch (584mm BSD) |
| Tire Width | 2.4in |
| Tire Outer Diameter | 705.9mm |
| Bike Length with Tires | 1943.9mm |
| Suspension Type | Hardtail (Front suspension) |
| Bar Type | Flat Bar |
| Fork Travel | 130mm |
| Suspension Sag | Unknown |
| Frame Material | Aluminum |
| Fork Material | Unknown |
| Brake Type | Disc |
Source:https://www.bird.bike/wp-content/uploads/2018/11/Zero-TR-Technical-Data-Sheet-V1.0.svg