2025 Specialized · RD
2025 Specialized Aethos 2 geometry
Full frame geometry for the 2025 Specialized Aethos 2, size by size — stack, reach, angles and tube lengths.
Does this bike fit you?
Get sized in minutes — no tape measure, no appointment.
Geometry by size
| Size | Stack (mm) | Reach (mm) | Seat angle (°) | Head angle (°) | Head tube (mm) | Top tube (mm) | Seat tube (mm) | Standover (mm) | BB drop (mm) | Front centre (mm) | Chainstay (mm) | Wheelbase (mm) | Fork rake (mm) | Trail (mm) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 49 | 522 | 373 | 75.5 | 71.4 | 114 | 508 | 450 | 719 | 76.5 | 581 | 410 | 978 | 50 | 62 |
| 52 | 538 | 377 | 74.5 | 72.1 | 128 | 526 | 470 | 737 | 76.5 | 584 | 410 | 981 | 50 | 58 |
| 54 | 559 | 384 | 74 | 72.5 | 150 | 544 | 490 | 759 | 75 | 594 | 410 | 992 | 50 | 55 |
| 56 | 580 | 391 | 74 | 73 | 169 | 557 | 510 | 779 | 75 | 599 | 410 | 998 | 47 | 55 |
| 58 | 606 | 398 | 74 | 73 | 198 | 572 | 535 | 805 | 73.5 | 614 | 410 | 1013 | 47 | 55 |
| 61 | 627 | 404 | 74 | 73.5 | 218 | 584 | 570 | 834 | 73.5 | 621 | 410 | 1020 | 47 | 52 |
All measurements in millimetres unless marked (°) for angles.