Bird Forge 2021
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Geometry
| Medium | Medium Long | Large | Extra Large (unsagged) | Extra Large | |
|---|---|---|---|---|---|
| Add to Compare | |||||
| Reach | 391 | 404 | 429 | 521 | 522 |
| Stack | 774 | 577 | 621 | 578 | 745 |
| Top Tube (effective) | 616 | 716 | 755 | 579 | 622 |
| Seat Tube C-T | 451 | 415 | 410 | 517 | |
| Seat Tube (effective) | 68 | 66 | 72 | 90 | |
| Head Angle | 53 | 53 | 62 | 71 | 53 |
| Seat Angle | 85 | 84 | 61 | 64 | 69 |
| Head Tube | 91 | 126 | 125 | 139 | 111 |
| Chainstay | 508 | 487 | 442 | 399 | 361 |
| Wheelbase | 1084 | 1419 | 1328 | 1200 | 1267 |
| BB Drop | 88 | 79 | 94 | 72 | 85 |
| BB Height | 238 | 313 | 242 | 248 | 270 |
| BB Type | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded |
| Fork Rake / Offset | 38 | 36 | 37 | 36 | 39 |
| Fork Length (A2C) | 499 | 585 | 606 | 442 | |
| Seatpost Diameter | 35 | 35 | 26 | 28 | 30 |
| Wheel Size | 30 | 25 | 27 | 32 | 27 |
| Front Travel | 134 | 160 | 142 | 165 | 145 |
| Headset | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 |
| Seat Clamp | 30 | 41 | 41 | 35 | 31 |
| 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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