Bird Forge 2021
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Geometry
| Medium | Medium Long | Large | Extra Large (unsagged) | Extra Large | |
|---|---|---|---|---|---|
| Add to Compare | |||||
| Reach | 416 | 402 | 498 | 422 | 591 |
| Stack | 725 | 628 | 660 | 744 | 735 |
| Top Tube (effective) | 567 | 519 | 740 | 789 | 614 |
| Seat Tube C-T | 399 | 398 | 509 | 505 | |
| Seat Tube (effective) | 78 | 68 | 78 | 87 | |
| Head Angle | 77 | 76 | 67 | 55 | 55 |
| Seat Angle | 86 | 63 | 88 | 65 | 80 |
| Head Tube | 101 | 125 | 116 | 136 | 122 |
| Chainstay | 383 | 451 | 370 | 384 | 505 |
| Wheelbase | 1170 | 1038 | 1362 | 1224 | 1206 |
| BB Drop | 91 | 91 | 75 | 72 | 70 |
| BB Height | 265 | 311 | 317 | 320 | 318 |
| BB Type | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded |
| Fork Rake / Offset | 41 | 35 | 42 | 38 | 37 |
| Fork Length (A2C) | 462 | 518 | 447 | 583 | |
| Seatpost Diameter | 31 | 29 | 25 | 28 | 35 |
| Wheel Size | 33 | 24 | 34 | 24 | 34 |
| Front Travel | 123 | 137 | 126 | 134 | 141 |
| Headset | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 |
| Seat Clamp | 36 | 38 | 41 | 41 | 28 |
| 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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