Bird Forge 2021
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Geometry
| Add to Compare |
| Reach |
| Stack |
| Top Tube (effective) |
| Seat Tube C-T |
| Seat Tube (effective) |
| Head Angle |
| Seat Angle |
| Head Tube |
| Chainstay |
| Wheelbase |
| BB Drop |
| BB Height |
| BB Type |
| Fork Rake / Offset |
| Fork Length (A2C) |
| Seatpost Diameter |
| Wheel Size |
| Front Travel |
| Headset |
| Seat Clamp |
| Data Source |
| Medium | Medium Long | Large | Extra Large (unsagged) | Extra Large | |
|---|---|---|---|---|---|
| Add to Compare | |||||
| Reach | 487 | 391 | 398 | 558 | 452 |
| Stack | 725 | 593 | 571 | 815 | 576 |
| Top Tube (effective) | 709 | 694 | 576 | 714 | 562 |
| Seat Tube C-T | 358 | 400 | 491 | 378 | |
| Seat Tube (effective) | 70 | 75 | 65 | 65 | |
| Head Angle | 74 | 65 | 61 | 52 | 54 |
| Seat Angle | 81 | 68 | 77 | 64 | 88 |
| Head Tube | 102 | 114 | 106 | 126 | 127 |
| Chainstay | 453 | 383 | 505 | 518 | 493 |
| Wheelbase | 1120 | 1303 | 1271 | 1096 | 1099 |
| BB Drop | 98 | 88 | 103 | 63 | 100 |
| BB Height | 256 | 294 | 307 | 333 | 242 |
| BB Type | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded | 73mm BSA Threaded |
| Fork Rake / Offset | 46 | 35 | 37 | 49 | 49 |
| Fork Length (A2C) | 410 | 578 | 547 | 545 | |
| Seatpost Diameter | 29 | 30 | 31 | 26 | 35 |
| Wheel Size | 31 | 30 | 26 | 31 | 31 |
| Front Travel | 132 | 124 | 138 | 143 | 119 |
| Headset | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 | EC34 / EC44 |
| Seat Clamp | 31 | 34 | 41 | 36 | 35 |
| 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/ |
Select 
two sizes then 'Compare'
two sizes then 'Compare'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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