Bird Forge 2021
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Geometry
| Medium | Medium Long | Large | Extra Large (unsagged) | Extra Large | |
|---|---|---|---|---|---|
| Add to Compare | |||||
| Reach | 512 | 463 | 470 | 490 | 522 |
| Stack | 583 | 618 | 671 | 777 | 640 |
| Top Tube (effective) | 554 | 753 | 651 | 565 | 760 |
| Seat Tube C-T | 325 | 379 | 455 | 484 | |
| Seat Tube (effective) | 86 | 67 | 61 | 74 | |
| Head Angle | 67 | 68 | 54 | 69 | 54 |
| Seat Angle | 65 | 85 | 75 | 67 | 72 |
| Head Tube | 96 | 131 | 115 | 141 | 108 |
| Chainstay | 371 | 375 | 349 | 515 | 416 |
| Wheelbase | 974 | 1101 | 1174 | 1118 | 1389 |
| BB Drop | 87 | 89 | 82 | 66 | 78 |
| BB Height | 313 | 324 | 257 | 348 | 309 |
| BB Type | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded |
| Fork Rake / Offset | 38 | 48 | 37 | 39 | 43 |
| Fork Length (A2C) | 469 | 523 | 474 | 592 | |
| Seatpost Diameter | 36 | 30 | 26 | 34 | 33 |
| Wheel Size | 27 | 33 | 28 | 33 | 33 |
| Front Travel | 154 | 118 | 128 | 167 | 144 |
| Headset | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 |
| Seat Clamp | 39 | 34 | 32 | 34 | 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
Measurements are in millimeters and degrees.
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