Bird Forge 2021
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Geometry
| Medium | Medium Long | Large | Extra Large (unsagged) | Extra Large | |
|---|---|---|---|---|---|
| Add to Compare | |||||
| Reach | 480 | 483 | 570 | 430 | 465 |
| Stack | 619 | 567 | 789 | 752 | 604 |
| Top Tube (effective) | 520 | 658 | 619 | 568 | 645 |
| Seat Tube C-T | 352 | 383 | 409 | 408 | |
| Seat Tube (effective) | 85 | 89 | 81 | 73 | |
| Head Angle | 59 | 63 | 72 | 59 | 68 |
| Seat Angle | 63 | 88 | 78 | 62 | 66 |
| Head Tube | 107 | 96 | 117 | 128 | 146 |
| Chainstay | 351 | 500 | 403 | 515 | 417 |
| Wheelbase | 1341 | 1291 | 1262 | 1436 | 1074 |
| BB Drop | 95 | 94 | 100 | 63 | 80 |
| BB Height | 305 | 250 | 321 | 321 | 302 |
| BB Type | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded |
| Fork Rake / Offset | 50 | 36 | 34 | 38 | 38 |
| Fork Length (A2C) | 454 | 586 | 550 | 520 | |
| Seatpost Diameter | 35 | 34 | 28 | 34 | 31 |
| Wheel Size | 34 | 30 | 30 | 31 | 33 |
| Front Travel | 125 | 128 | 162 | 166 | 117 |
| Headset | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 |
| Seat Clamp | 32 | 37 | 41 | 33 | 40 |
| Data Source | Manufacturer + https://madscientistmtb.com/sagged-hardtail-geometry-calculator/ | Manufacturer + https://madscientistmtb.com/sagged-hardtail-geometry-calculator/ | Manufacturer + https://madscientistmtb.com/sagged-hardtail-geometry-calculator/ | Manufacturer + https://madscientistmtb.com/sagged-hardtail-geometry-calculator/ | Manufacturer + https://madscientistmtb.com/sagged-hardtail-geometry-calculator/ |
Note: Sagged 30% with 140mm Fork
Standard measurements are in millimeters and degrees. The site attempts to recognize and convert other units back to standard - results may vary.
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