2022 Bird Bikes Forge 140mm Fork

Design
Flat Bar, Hardtail (Front suspension)
Frame
Steel
Suspension
140mm fork travel, 30% sag
Features
Disc brake
Somewhat upright stack and reachvs category
Somewhat upright stack and reachvs category
Somewhat upright stack and reachvs category
Somewhat upright stack and reachvs category

Geometry

Medium
Medium Long
Large
Extra Large
Stack
654mm
663mm
672mm
681mm
Reach
449mm
473mm
496mm
518mm
Stack to Reach Ratio
1.46:1
1.4:1
1.35:1
1.31:1
Seat Tube Length, C-T
395mm
420mm
445mm
470mm
Top Tube Length, Effective/Horizontal HT Top
605mm
630mm
655mm
680mm
Head Tube Angle
65.8deg
65.8deg
65.8deg
65.8deg
Effective Seat Tube Angle, ETT HT Top
76.8deg
76.8deg
76.8deg
76.8deg
Seat Tube Exit Angle
75deg
75deg
75deg
75deg
Head Tube Length
100mm
110mm
120mm
130mm
Bottom Bracket Drop
87mm
87mm
87mm
87mm
Bottom Bracket Height
290mm
290mm
290mm
290mm
Chainstay Length
430mm
430mm
435mm
435mm
Chainstay Length Horizontal
421.1mm
421.1mm
426.2mm
426.2mm
Front-Center
766.8mm
793.7mm
820.4mm
847.3mm
Front-Center Horizontal
761.9mm
788.9mm
815.8mm
842.8mm
Wheelbase
1183mm
1210mm
1242mm
1269mm
Fork Offset/Rake
42mm
42mm
42mm
42mm
Fork Length (Axle-To-Crown)
509mm
509mm
509mm
509mm
Trail
123.4mm
very high
123.4mm
very high
123.4mm
very high
123.4mm
very high
Mechanical Trail
112.6mm
112.6mm
112.6mm
112.6mm
Wheel Flop
46.1mm
46.1mm
46.1mm
46.1mm
Tire to Pedal Spindle
219.8mm
170 mm cranks
246.6mm
170 mm cranks
273.4mm
170 mm cranks
300.2mm
170 mm cranks
Pedal Spindle to Ground Clearance
120mm
170 mm cranks
120mm
170 mm cranks
120mm
170 mm cranks
120mm
170 mm cranks

140mm Fork Build

Medium
Medium Long
Large
Extra Large
Wheel Size
700C/29 in
622 mm BSD
700C/29 in
622 mm BSD
700C/29 in
622 mm BSD
700C/29 in
622 mm BSD
Tire Width
2.6in
2.6in
2.6in
2.6in
Tire Width Max
2.6in
2.6in
2.6in
2.6in
Tire Outer Diameter
754.1mm
754.1mm
754.1mm
754.1mm
Bike Length with Tires
1937.1mm
1964.1mm
1996.1mm
2023.1mm

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
Source:https://www.bird.bike/wp-content/uploads/2022/03/Forge-Full-1.png