Specialized Roubaix SL8
Endurance road · 7 sizes
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- Bike
- Specialized Roubaix SL8 · Endurance road · 7 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) |
|---|---|---|---|---|---|---|---|---|
| 44 | 543 | 353 | 69.3 | 75 | 90 | 418 | 994 | 686 |
| 49 | 549 | 363 | 70.8 | 74 | 90 | 418 | 992 | 719 |
| 52 | 566 | 370 | 71.5 | 74 | 105 | 418 | 988 | 747 |
| 54 | 585 | 381 | 72.3 | 74 | 122 | 420 | 1005 | 766 |
| 56 | 605 | 389 | 73 | 73.5 | 140 | 420 | 1012 | 787 |
| 58 | 630 | 397 | 73 | 73.5 | 168 | 423 | 1031 | 809 |
| 61 | 665 | 403 | 73.5 | 73.5 | 202 | 423 | 1042 | 847 |
The table runs on to the right: 6 more columns after Reach. Scroll it sideways to read them.
The 54 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 size44 70 x 360, 49 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.S-Works Roubaix SL8: S-Works Future Stem with integrated computer mount and S-Works Carbon Hover bar (125 mm drop, 75 mm reach, Hover rise) in the table's per-size stem lengths 70/80/90/100/100/110/110 mm and widths 360/380/400/420/420/440/440 mm; Future Shock 3 suspension stem unit in the head tube (the stack is measured with the Future Shock cartridge); S-Works Pave seatpost, 380 mm (44-56) / 450 mm (58-61).
Cockpit and seatpost, in the maker's words · 72 words
S-Works Roubaix SL8: S-Works Future Stem with integrated computer mount and S-Works Carbon Hover bar (125 mm drop, 75 mm reach, Hover rise) in the table's per-size stem lengths 70/80/90/100/100/110/110 mm and widths 360/380/400/420/420/440/440 mm; Future Shock 3 suspension stem unit in the head tube (the stack is measured with the Future Shock cartridge); S-Works Pave seatpost, 380 mm (44-56) / 450 mm (58-61). Spacer and top-cover heights not on the page.
OFFICIAL SOURCE: Specialized GB page for the S-Works Roubaix SL8 - Shimano Dura-Ace Di2 (code 4221816), seven sizes 44-61. Source: html table (official Specialized GB product page, "Geometry" accordion, HTML table; fetched 2026-08-29
How I read the maker's table
The stack values include the Future Shock 3 unit as Specialized publishes them; head angle printed to a tenth (69.3, 70.8, 72.3). Front centre, trail and fork length (375 mm) published. ODDITY AS PRINTED: wheelbase falls from 994 (44) to 992 (49) to 988 (52) then rises to 1005 (54). 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)