The geometry chart below applies to all Specialized Aethos frames from the following:
- Years: 2019, 2020, 2021, 2022, 2023
- Models: S-Works, Pro, Comp, Expert, Base
- Frame material: Carbon
| Frame Size | 49 | 52 | 54 | 56 | 58 | 61 |
|---|---|---|---|---|---|---|
| Suggested Rider Height (cm) | 155 to 163 | 163 to 170 | 170 to 175 | 175 to 180 | 180 to 188 | 188 to 196 |
| Suggested Rider Height (ft) | 5’1″ to 5’4″ | 5’4″ to 5’7″ | 5’7″ to 5’9″ | 5’9″ to 5’11” | 5’11” to 6’2″ | 6’2″ to 6’5″ |
| Stack (mm) | 514 | 527 | 544 | 565 | 591 | 612 |
| Reach (mm) | 375 | 380 | 384 | 395 | 402 | 408 |
| Top Tube, Horizontal (mm) | 508 | 531 | 540 | 562 | 577 | 595 |
| Seat Tube (mm) | 431 | 462 | 481 | 504 | 532 | 567 |
| Seat Tube Angle | 75.5° | 74° | 74° | 73.5° | 73.5° | 73° |
| Head Tube (mm) | 109 | 120 | 137 | 157 | 184 | 204 |
| Head Tube Angle | 71.75° | 72.5° | 73° | 73.5° | 73.5° | 74° |
| BB Height (mm) | 266 | 266 | 268 | 268 | 268 | 268 |
| BB Drop (mm) | 74 | 74 | 72 | 72 | 72 | 72 |
| Fork Trail (mm) | 63 | 58 | 58 | 55 | 55 | 52 |
| Fork Length (mm) | 369 | 369 | 369 | 369 | 369 | 369 |
| Fork Offset (mm) | 47 | 47 | 44 | 44 | 44 | 44 |
| Front Center (mm) | 574 | 577 | 579 | 591 | 606 | 613 |
| Chainstay (mm) | 410 | 410 | 410 | 410 | 410 | 410 |
| Wheelbase (mm) | 973 | 975 | 978 | 991 | 1005 | 1012 |
| Standover Height (mm) | 705 | 728 | 748 | 769 | 796 | 824 |
| Crank Length (mm) | 165 | 170 | 172.5 | 172.5 | 175 | 175 |
| Handlebar Width (mm) | 380 | 400 | 420 | 420 | 440 | 440 |
| Stem Length (mm) | 80 | 90 | 100 | 100 | 110 | 110 |
| Saddle Width (mm) | 155 | 155 | 143 | 143 | 143 | 143 |
| Seatpost Length (mm) | 300 | 300 | 360 | 360 | 360 | 360 |
Source : Specialized
Learn more about what the frame geometry measurements mean here.