2017 Bird Bikes Zero TR Base
- Category
- Hardtail Trail MTB
- Design
- Flat Bar, Hardtail (Front suspension)
- Frame
- Aluminum
- Suspension
- 130mm fork travel
- Features
- Disc brake
Average stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Average stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Average stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Somewhat aggressive stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Somewhat aggressive stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry |
Geometry
XS | S | M | L | XL | |
Stack | 610mm | 610mm | 619mm | 619mm | 628mm |
Reach | 400mm | 425mm | 447mm | 472mm | 495mm |
Stack to Reach Ratio | 1.53:1 | 1.44:1 | 1.38:1 | 1.31:1 | 1.27:1 |
Seat Tube Length, Unknown | 380mm | 410mm | 440mm | 470mm | 500mm |
Top Tube Length, Effective/Horizontal Unknown | 575mm | 600mm | 625mm | 650mm | 675mm |
Top Tube Slope | 25.9deg | 21.9deg | 19deg | 15.5deg | 13.1deg |
Head Tube Angle | 66.2deg | 66.2deg | 66.2deg | 66.2deg | 66.2deg |
Seat Tube Angle | 74deg | 74deg | 74deg | 74deg | 74deg |
Head Tube Length | 110mm | 110mm | 120mm | 120mm | 130mm |
Bottom Bracket Drop | 58mm | 58mm | 58mm | 58mm | 58mm |
Bottom Bracket Height | 295mm | 295mm | 295mm | 295mm | 295mm |
Chainstay Length | 430mm | 430mm | 430mm | 435mm | 440mm |
Chainstay Length Horizontal | 426.1mm | 426.1mm | 426.1mm | 431.1mm | 436.2mm |
Front-Center | 699.3mm | 724.3mm | 750.2mm | 775.1mm | 803.9mm |
Front-Center Horizontal | 696.9mm | 721.9mm | 747.9mm | 772.9mm | 801.8mm |
Wheelbase | 1123mm | 1148mm | 1174mm | 1204mm | 1238mm |
Fork Offset/Rake | 42mm | 42mm | 42mm | 42mm | 42mm |
Fork Length, Unknown | 522mm | 522mm | 522mm | 522mm | 522mm |
Trail | 109.8mm very high | 109.8mm very high | 109.8mm very high | 109.8mm very high | 109.8mm very high |
Mechanical Trail | 100.4mm | 100.4mm | 100.4mm | 100.4mm | 100.4mm |
Wheel Flop | 40.5mm | 40.5mm | 40.5mm | 40.5mm | 40.5mm |
Standover Height | 631mm | 658mm | 685mm | 711mm | 738mm |
Tire to Pedal Spindle | 176.4mm 170 mm cranks | 201.3mm 170 mm cranks | 227.2mm 170 mm cranks | 252.1mm 170 mm cranks | 281mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 125mm 170 mm cranks | 125mm 170 mm cranks | 125mm 170 mm cranks | 125mm 170 mm cranks | 125mm 170 mm cranks |
Base Build
XS | S | M | L | XL | |
Wheel Size | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD |
Tire Width | 2.4in | 2.4in | 2.4in | 2.4in | 2.4in |
Tire Outer Diameter | 705.9mm | 705.9mm | 705.9mm | 705.9mm | 705.9mm |
Bike Length with Tires | 1828.9mm | 1853.9mm | 1879.9mm | 1909.9mm | 1943.9mm |
Stack and Reach vs. Category Trend
Very Upright
Somewhat Upright
Average
Somewhat Aggressive
Very Aggressive
The Bike Insights Upright/Aggressive scale is based on analysis of a bike’s proportions relative to similar sized bikes in the same category.
Learn more about the Upright/Aggressive ScaleCategory Trend
Hardtail Trail MTBSource:https://www.bird.bike/wp-content/uploads/2018/11/Zero-TR-Technical-Data-Sheet-V1.0.svg