Specialized Aethos
Road · 6 sizes
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This is the bike I ride
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- Bike
- Specialized Aethos · 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 | 514 | 375 | 71.75 | 75.5 | 109 | 410 | 973 | 705 |
| 52 | 527 | 380 | 72.5 | 74 | 120 | 410 | 975 | 728 |
| 54 | 544 | 384 | 73 | 74 | 137 | 410 | 978 | 748 |
| 56 | 565 | 395 | 73.5 | 73.5 | 157 | 410 | 991 | 769 |
| 58 | 591 | 402 | 73.5 | 73.5 | 184 | 410 | 1005 | 796 |
| 61 | 612 | 408 | 74 | 73 | 204 | 410 | 1012 | 824 |
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.
Stock stem and bar per size49 80 x 380, 52 90 x 400, 54 100 x 420, 56 100 x 420, 58 110 x 440, 61 110 x 440 (stem length x bar width, mm)
In the maker's words
Kept whole, as I read it off specialized.com.Aethos Comp (first-generation Aethos, still sold): Specialized Pro SL alloy 4-bolt stem and Specialized Shallow Drop 6061 bar (70 mm reach x 125 mm drop, 31.8 mm) in the table's per-size stem lengths 80/90/100/100/110/110 mm and widths 380/400/420/420/440/440 mm; Roval Alpinist carbon seatpost.
Cockpit and seatpost, in the maker's words · 51 words
Aethos Comp (first-generation Aethos, still sold): Specialized Pro SL alloy 4-bolt stem and Specialized Shallow Drop 6061 bar (70 mm reach x 125 mm drop, 31.8 mm) in the table's per-size stem lengths 80/90/100/100/110/110 mm and widths 380/400/420/420/440/440 mm; Roval Alpinist carbon seatpost. Spacer and top-cover heights not on the page.
OFFICIAL SOURCE: Specialized GB page for the Aethos Comp - Shimano 105 Di2 (code 4221546), six sizes 49-61: the ORIGINAL Aethos geometry (stack 514-612, reach 375-408, 47/44 mm fork offsets), which Specialized still sells alongside the new Aethos 2 (specialized-aethos-2.json) whose numbers differ. Source: html table (official Specialized GB product page, "Geometry" accordion, HTML table; fetched 2026-08-29
How I read the maker's table
Front centre, trail and fork length (369 mm) are published. 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)