Specialized Aethos 2
Road · 6 sizes
Sign in and add the bike you ride, and this table will say what each size needs for your position.
Sign in
This is the bike I ride
No account is needed to read the table. Report a wrong number · Correct this bike
- Bike
- Specialized Aethos 2 · Road · 6 sizes
- Geometry
- specialized.com, fetched 29 Aug 2026, re-checked, no differences
- Cockpit
- Generic stem and bar, assumed
- Solved with
- cover 15 mm (assumed), max spacers 40 mm (assumed), stem clamp centre 20 mm (assumed), so every verdict carries ±10 mm at the bar
- Sheet
- 6 September 2026 · 210 bikes, 43 makes, 1,262 sizes in the catalogue
Geometry, every size, from the maker's table
The tinted row is the size drawn beside it. Press a size to draw it.| Size | Stack (mm) | Reach (mm) | Head angle (deg) | Seat angle (deg) | Head tube (mm) | Chainstay (mm) | Wheelbase (mm) | Standover (mm) |
|---|---|---|---|---|---|---|---|---|
| 49 | 522 | 373 | 71.4 | 75.5 | 114 | 410 | 978 | 719 |
| 52 | 538 | 377 | 72.1 | 74.5 | 128 | 410 | 981 | 737 |
| 54 | 559 | 384 | 72.5 | 74 | 150 | 410 | 992 | 759 |
| 56 | 580 | 391 | 73 | 74 | 169 | 410 | 998 | 779 |
| 58 | 606 | 398 | 73 | 74 | 198 | 410 | 1013 | 805 |
| 61 | 627 | 404 | 73.5 | 74 | 218 | 410 | 1020 | 834 |
The table runs on to the right: 6 more columns after Reach. Scroll it sideways to read them.
The 56 drawn to scale from the table, with no build on it. Stack and reach run from the bottom bracket to the top of the head tube; every size is solved from those two. One square is 100 mm.
The maker's cockpit
No stock cockpit I can name, so every size is solved on a generic stem and bar unless you choose one on the sheet.Generic stem and barAssumedNo bar is listed for this frame.
In the maker's words
Kept whole, as I read it off specialized.com.Aethos 2 Frameset: frame, fork, Roval Alpinist carbon seatpost and alloy 30 mm seat binder; complete bikes use a two-piece Roval Alpinist bar and stem (sizes per build).
Cockpit and seatpost, in the maker's words · 46 words
Aethos 2 Frameset: frame, fork, Roval Alpinist carbon seatpost and alloy 30 mm seat binder; complete bikes use a two-piece Roval Alpinist bar and stem (sizes per build). Seatpost length row 300 mm (49-52) / 360 mm (54-61). Spacer and top-cover heights not on the page.
OFFICIAL SOURCE: Specialized GB page for the Aethos 2 Frameset (code 4221561), six sizes 49-61, the second-generation Aethos (2026 Design and Innovation Award on the page). Source: html table (official Specialized GB product page, "Geometry" accordion, HTML table; fetched 2026-08-29
How I read the maker's table
the first-generation Aethos is in specialized-aethos.json. BB drop printed to a half millimetre (76.5 / 75 / 73.5) and BB height 265.5-268.5 mm as printed. Values are printed with mm and degree suffixes, stripped by script. Stack/reach are to the head tube top per Specialized's geometry drawing. Model year is not printed on the page (null); the page is the current GB listing on the fetch date.
Source: html table (official Specialized GB product page, "Geometry" accordion, HTML table; fetched 2026-08-29, HTTP 200)