2017 Bird Bikes Zero TR Base

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 Scale
Category Trend
Hardtail Trail MTB
Source:https://www.bird.bike/wp-content/uploads/2018/11/Zero-TR-Technical-Data-Sheet-V1.0.svg