Bird Forge 2021
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Geometry
| Medium | Medium Long | Large | Extra Large (unsagged) | Extra Large | |
|---|---|---|---|---|---|
| Add to Compare | |||||
| Reach | 451 | 542 | 546 | 513 | 483 |
| Stack | 748 | 575 | 658 | 599 | 656 |
| Top Tube (effective) | 656 | 686 | 557 | 581 | 662 |
| Seat Tube C-T | 347 | 490 | 368 | 522 | |
| Seat Tube (effective) | 74 | 69 | 76 | 74 | |
| Head Angle | 66 | 62 | 69 | 65 | 77 |
| Seat Angle | 75 | 76 | 70 | 83 | 75 |
| Head Tube | 107 | 111 | 101 | 113 | 112 |
| Chainstay | 427 | 410 | 478 | 413 | 398 |
| Wheelbase | 1118 | 1407 | 1471 | 1419 | 1373 |
| BB Drop | 73 | 84 | 85 | 79 | 84 |
| BB Height | 255 | 304 | 332 | 334 | 321 |
| BB Type | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded |
| Fork Rake / Offset | 46 | 39 | 50 | 46 | 44 |
| Fork Length (A2C) | 409 | 569 | 537 | 508 | |
| Seatpost Diameter | 28 | 34 | 30 | 25 | 35 |
| Wheel Size | 29 | 27 | 28 | 23 | 28 |
| Front Travel | 151 | 160 | 136 | 145 | 158 |
| Headset | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 |
| Seat Clamp | 28 | 33 | 28 | 29 | 40 |
| 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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