Bird Forge 2021
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Geometry
| Medium | Medium Long | Large | Extra Large (unsagged) | Extra Large | |
|---|---|---|---|---|---|
| Add to Compare | |||||
| Reach | 512 | 562 | 499 | 566 | 567 |
| Stack | 692 | 621 | 581 | 670 | 766 |
| Top Tube (effective) | 589 | 550 | 638 | 673 | 741 |
| Seat Tube C-T | 335 | 403 | 363 | 517 | |
| Seat Tube (effective) | 69 | 70 | 68 | 91 | |
| Head Angle | 65 | 56 | 75 | 52 | 67 |
| Seat Angle | 80 | 73 | 71 | 83 | 61 |
| Head Tube | 111 | 90 | 123 | 115 | 129 |
| Chainstay | 411 | 436 | 517 | 416 | 489 |
| Wheelbase | 1070 | 1450 | 1003 | 1248 | 1104 |
| BB Drop | 86 | 95 | 100 | 65 | 74 |
| BB Height | 282 | 241 | 269 | 258 | 233 |
| BB Type | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded |
| Fork Rake / Offset | 39 | 39 | 39 | 38 | 41 |
| Fork Length (A2C) | 421 | 579 | 421 | 545 | |
| Seatpost Diameter | 25 | 26 | 33 | 36 | 31 |
| Wheel Size | 32 | 23 | 32 | 23 | 25 |
| Front Travel | 142 | 135 | 152 | 154 | 122 |
| Headset | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 |
| Seat Clamp | 28 | 39 | 35 | 29 | 37 |
| 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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