Bird Forge 2021
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Geometry
| Medium | Medium Long | Large | Extra Large (unsagged) | Extra Large | |
|---|---|---|---|---|---|
| Add to Compare | |||||
| Reach | 497 | 554 | 405 | 554 | 491 |
| Stack | 643 | 769 | 590 | 576 | 617 |
| Top Tube (effective) | 570 | 724 | 646 | 759 | 586 |
| Seat Tube C-T | 421 | 343 | 491 | 455 | |
| Seat Tube (effective) | 76 | 82 | 76 | 79 | |
| Head Angle | 61 | 63 | 74 | 63 | 72 |
| Seat Angle | 85 | 75 | 63 | 74 | 77 |
| Head Tube | 88 | 108 | 109 | 129 | 141 |
| Chainstay | 505 | 364 | 444 | 429 | 387 |
| Wheelbase | 1173 | 1438 | 1084 | 1452 | 1341 |
| BB Drop | 90 | 103 | 86 | 60 | 90 |
| BB Height | 246 | 265 | 312 | 298 | 303 |
| BB Type | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded |
| Fork Rake / Offset | 35 | 49 | 39 | 46 | 40 |
| Fork Length (A2C) | 444 | 413 | 524 | 475 | |
| Seatpost Diameter | 30 | 31 | 28 | 27 | 25 |
| Wheel Size | 28 | 30 | 24 | 34 | 27 |
| Front Travel | 136 | 135 | 133 | 139 | 166 |
| Headset | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 |
| Seat Clamp | 35 | 36 | 31 | 34 | 39 |
| 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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