Bird Forge 2021
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Geometry
| Medium | Medium Long | Large | Extra Large (unsagged) | Extra Large | |
|---|---|---|---|---|---|
| Add to Compare | |||||
| Reach | 428 | 514 | 565 | 403 | 504 |
| Stack | 778 | 634 | 613 | 809 | 643 |
| Top Tube (effective) | 560 | 682 | 779 | 675 | 810 |
| Seat Tube C-T | 332 | 364 | 367 | 480 | |
| Seat Tube (effective) | 75 | 91 | 68 | 66 | |
| Head Angle | 54 | 67 | 76 | 52 | 64 |
| Seat Angle | 68 | 64 | 84 | 85 | 79 |
| Head Tube | 111 | 113 | 128 | 126 | 104 |
| Chainstay | 490 | 475 | 451 | 376 | 516 |
| Wheelbase | 1093 | 1109 | 1313 | 1244 | 1411 |
| BB Drop | 77 | 100 | 92 | 73 | 76 |
| BB Height | 341 | 325 | 297 | 332 | 247 |
| BB Type | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded |
| Fork Rake / Offset | 34 | 36 | 39 | 46 | 35 |
| Fork Length (A2C) | 474 | 432 | 430 | 589 | |
| Seatpost Diameter | 34 | 36 | 30 | 27 | 36 |
| Wheel Size | 25 | 23 | 32 | 30 | 30 |
| Front Travel | 161 | 147 | 125 | 138 | 121 |
| Headset | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 |
| Seat Clamp | 37 | 40 | 40 | 29 | 38 |
| 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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