2021 Bird Bikes Zero 29 Base Extra Large
Build
700C/29 in × 2.5 in
Insights
Somewhat upright stack and reach vs trend of hardtail trail mtb bikes
Design deviates from other sizes of Bird Bikes Zero 29
Stack and Reach vs. Category Trend
View all sizes
Geometry
| Stack | 664mm |
| Reach | 504mm |
| Stack to Reach Ratio | 1.32:1 |
| Seat Tube Length, C-T | 470mm |
| Top Tube Length, Effective/Horizontal HT Top | 681mm |
| Head Tube Angle | 63.9deg |
| Effective Seat Tube Angle, ETT HT Top | 73.6deg |
| Head Tube Length | 140mm |
| Bottom Bracket Drop | 67.8mm |
| Bottom Bracket Height | 306.7mm |
| Chainstay Length | 440mm |
| Chainstay Length Horizontal | 434.7mm |
| Front-Center | 828mm |
| Front-Center Horizontal | 825.3mm |
| Wheelbase | 1260mm |
| Fork Offset/Rake | 42mm |
| Fork Length, Unknown | 541mm |
| Trail | 136.7mm very high |
| Mechanical Trail | 122.8mm |
| Wheel Flop | 54mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 283.5mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 136.7mm |
Base Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 2.5in |
| Tire Outer Diameter | 749mm |
| Bike Length with Tires | 2009mm |
| Suspension Type | Hardtail (Front suspension) |
| Bar Type | Flat Bar |
| Fork Travel | 130mm |
| Suspension Sag | 30% |
| Frame Material | Aluminum |
| Fork Material | Unknown |
| Brake Type | Unknown |
Source:https://www.bird.bike/wp-content/uploads/2021/09/Zero-29-Mk2-Tech-Sheet.svg