Specialized Aethos 2025 geometry
Size chart for fitting. If this bike already feels right, find others with a similar riding position (size 49). Category: road-race.
| Size | Stack | Reach | Head tube angle | Seat tube angle | Chainstay | Wheelbase | BB drop |
|---|---|---|---|---|---|---|---|
| 49 | 514 mm | 369 mm | 71.8° | 75.5° | 410 mm | 973 mm | 74 mm |
| 52 | 527 mm | 374 mm | 72.5° | 74.0° | 410 mm | 976 mm | 74 mm |
| 54 | 544 mm | 379 mm | 73.0° | 74.0° | 410 mm | 980 mm | 72 mm |
| 56 | 565 mm | 387 mm | 73.5° | 73.5° | 410 mm | 991 mm | 72 mm |
| 58 | 591 mm | 396 mm | 73.5° | 73.5° | 410 mm | 1006 mm | 72 mm |
| 61 | 612 mm | 403 mm | 74.0° | 73.0° | 410 mm | 1014 mm | 72 mm |
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Size guidance
Stack and reach describe the frame's cockpit envelope better than traditional seat-tube sizing. If you know your preferred stack/reach from a bike that already fits, search within a few millimeters first, then check head angle and chainstay for handling feel. See the glossary for stack, reach, and HTA.