Serk A10 The Purist
Road · 5 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
- Serk A10 The Purist · Road · 5 sizes
- Geometry
- serk.cc, fetched 28 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.The table runs on to the right: 6 more columns after Reach. Scroll it sideways to read them.
The M 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 serk.cc.NOT an integrated cockpit: the A10 uses a standard external stem and round bar with semi-integrated cable routing (maker: "Cables are hidden from the inlet ports near the head tube before exiting under the bottom bracket where they are exposed but hidden under the bike"; cable ports can be swapped for Di2 ports, and a port-free frame for wireless SRAM can be made on request).
Cockpit and seatpost, in the maker's words · 245 words
NOT an integrated cockpit: the A10 uses a standard external stem and round bar with semi-integrated cable routing (maker: "Cables are hidden from the inlet ports near the head tube before exiting under the bottom bracket where they are exposed but hidden under the bike"; cable ports can be swapped for Di2 ports, and a port-free frame for wireless SRAM can be made on request). Complete Ultegra build spec on the page lists "Handlebars : Fizik R5" and "Stem : Fizik R5" - no stem length, stem angle, bar width, bar reach or bar drop stated, and no per-size stem/bar table, so stock_stem_length and stock_bar_width are null. Frameset (RMB 14,200 / US$2200, in stock at time of collection) "Includes Serk Headset 40 Semi-integrated, seatpost clamp" and "Fork : Serk Carbon Road"; headset stack height, top cap height and maximum spacer stack are NOT published (maker only says you can "add in some spacers to achieve a more upright position"). Seatpost: "Seatpost : Serk Carbon 27.2mm" on the Ultegra build (round 27.2 mm post; offset/setback not published; frame takes any standard 27.2 mm post - maker stresses "Everything on our bike is standard size and commonly available"). Brakes: "Rim Brake / Quick Release" (rim-brake frame and fork, QR axles - not disc). Tyre clearance: "30mm measured tyres". BB: "T47 BB 68mm". Complete Ultegra build (RMB 23,500 / US$3599): R8000 rim-brake group 50/34 with 11-28, Shimano RS-11 wheels, Vittoria Rubino Pro 25c tyres, Prologo Scratch M5 saddle.
SOURCE: the maker's own product page https://www.serk.cc/a10/ (Serk Cycling, Beijing. Source: html_table
How I read the maker's table
also linked from https://www.serk.cc/titanium/ as "A10 - The Purist / Classic Rim Road Bike"). Geometry is a real HTML table (13 rows: Reach, Stack, then lettered rows A-J) with a labelled diagram https://www.serk.cc/wp-content/uploads/2019/07/geo.png (393x312 px, uploaded 2019-07). No aggregator was consulted. DIAGRAM CONVENTIONS (read from geo.png): Stack is the vertical distance from the horizontal line through the bottom bracket centre to the top of the head tube; Reach is the horizontal distance from the BB centre to the top of the head tube (standard stack/reach datum). A "Seat Tube Length" is dimensioned along the seat tube from the BB centre to the top of the seat tube (appears centre-to-top; not stated in words). B "Top Tube Length" is drawn as a HORIZONTAL dimension from the head tube top to the seat tube axis, so it is recorded as top_tube_effective (the maker does not use the word effective). C head tube length along the head tube. D "Seat Tube Angle" is drawn at the BB between the straight seat tube and the horizontal - i.e. E head tube angle, F BB drop, G chainstay, H wheelbase (axle to axle), I fork offset, J trail - all as labelled by the maker. NOT PUBLISHED: standover, front centre, fork length, frame weight, rider height guide (none on the A10 page or the titanium range page) - all null. SIZE NAMING: five sizes XS / S / M / L / XL; the seat tube lengths 470/490/510/530/550 mm are the closest thing to a numeric size. Table is undated; the page says "Our 2022 A10 now has clearance for larger tyres - 30mm measured", so model_year is set to 2022 (the current revision of the frame; the geometry diagram file dates from 2019 and may pre-date that revision - treat model_year as the revision year, not a proven geometry year). Page first published 2020-05-22, last modified 2025-10-22, live on 2026-08-28. Material: titanium 3Al/2.5V. Values are exactly as printed (trail to one decimal). Angles stored as numbers (degrees).
