Bird Forge 2021
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Geometry
| Medium | Medium Long | Large | Extra Large (unsagged) | Extra Large | |
|---|---|---|---|---|---|
| Add to Compare | |||||
| Reach | 452 | 541 | 531 | 591 | 441 |
| Stack | 667 | 542 | 784 | 579 | 711 |
| Top Tube (effective) | 545 | 579 | 526 | 760 | 738 |
| Seat Tube C-T | 327 | 403 | 392 | 531 | |
| Seat Tube (effective) | 85 | 65 | 87 | 64 | |
| Head Angle | 57 | 68 | 76 | 64 | 59 |
| Seat Angle | 79 | 76 | 84 | 81 | 80 |
| Head Tube | 92 | 101 | 111 | 117 | 136 |
| Chainstay | 404 | 483 | 514 | 460 | 375 |
| Wheelbase | 1184 | 1291 | 1145 | 1490 | 1500 |
| BB Drop | 73 | 103 | 80 | 59 | 103 |
| BB Height | 238 | 246 | 314 | 241 | 266 |
| BB Type | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded |
| Fork Rake / Offset | 40 | 50 | 37 | 36 | 45 |
| Fork Length (A2C) | 492 | 455 | 591 | 554 | |
| Seatpost Diameter | 29 | 35 | 31 | 28 | 28 |
| Wheel Size | 32 | 31 | 30 | 26 | 25 |
| Front Travel | 124 | 148 | 159 | 118 | 133 |
| Headset | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 |
| Seat Clamp | 34 | 34 | 41 | 35 | 41 |
| 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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