Bird Forge 2021
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Geometry
| Medium | Medium Long | Large | Extra Large (unsagged) | Extra Large | |
|---|---|---|---|---|---|
| Add to Compare | |||||
| Reach | 368 | 408 | 486 | 407 | 504 |
| Stack | 780 | 672 | 664 | 745 | 732 |
| Top Tube (effective) | 623 | 701 | 577 | 574 | 783 |
| Seat Tube C-T | 347 | 487 | 503 | 425 | |
| Seat Tube (effective) | 83 | 68 | 75 | 86 | |
| Head Angle | 52 | 52 | 76 | 72 | 72 |
| Seat Angle | 71 | 76 | 64 | 79 | 88 |
| Head Tube | 98 | 101 | 128 | 142 | 151 |
| Chainstay | 475 | 409 | 505 | 397 | 404 |
| Wheelbase | 1389 | 1292 | 1478 | 1101 | 1449 |
| BB Drop | 89 | 89 | 83 | 61 | 78 |
| BB Height | 232 | 244 | 279 | 286 | 261 |
| BB Type | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded |
| Fork Rake / Offset | 33 | 36 | 36 | 49 | 36 |
| Fork Length (A2C) | 538 | 528 | 425 | 557 | |
| Seatpost Diameter | 35 | 35 | 32 | 30 | 31 |
| Wheel Size | 34 | 31 | 24 | 33 | 34 |
| Front Travel | 165 | 141 | 149 | 124 | 114 |
| Headset | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 |
| Seat Clamp | 34 | 32 | 29 | 31 | 32 |
| 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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