Hongfu FM339
Aero road · 5 sizes
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- Bike
- Hongfu FM339 · Aero road · 5 sizes
- Geometry
- bikeinsights.com, fetched 22 Oct 2026
These numbers are second-hand, from Bike Insights. I have not checked them against the maker's own table. Bike Insights cites hongfu-bikes.com. - Seat angle convention
- Calculated from Bike Insights' table
- Cockpit
- Generic stem and bar, assumed
- Solved with
- cover 10 mm (assumed), max spacers 40 mm (assumed), stem clamp centre 20 mm (assumed), so every verdict carries ±10 mm at the bar
- Sheet
- 22 October 2026 · 879 bikes, 79 makes, 4,979 sizes in the catalogue
Geometry, every size, from Bike Insights
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)not published |
|---|---|---|---|---|---|---|---|---|
| 490 | 510.1 | 376.3 | 71.75 | 75.5 | 104 | 407 | 969.5 | |
| 520 | 523 | 381 | 72.5 | 74 | 115 | 407 | 970 | |
| 540 | 539 | 388 | 72.5 | 74 | 135 | 407 | 981 | |
| 560 | 558.7 | 396.5 | 73.5 | 73.5 | 153 | 407 | 989.1 | |
| 580 | 584.6 | 403.8 | 73.5 | 73.5 | 180 | 407 | 1004.1 |
The table runs on to the right: 6 more columns after Reach. Scroll it sideways to read them.
The 540 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.
Frame facts
not read off the maker's page yet: hongfu-bikes.com- Tyre clearance
- not recorded yet
- Bottom bracket
- not recorded yet
- Axles and brakes
- not recorded yet
- UDH
- not recorded yet
- Seatpost
- not recorded yet
- Frame weight
- not recorded yet
Notes on the source
SECOND-HAND NUMBERS: copied from Bike Insights (https://bikeinsights.com/bikes/6200fc8b4728d0001e0e2a59-hongfu-bikes-fm339?version=2020&build=base), not read off the maker's own table. Source: aggregator (Bike Insights)
How I read Bike Insights' table
Bike Insights cites the maker's page: http://www.hongfu-bikes.com/html_products/Road_Frame/Disc_Brake_Road_Frame/2018/0901/510.html. The maker no longer publishes this table, so these numbers have not been checked against it; the seed stores this version as an aggregator source and caps its band (D17, D4 second amendment). Build: Base. Bike Insights files it as Road Bike / Paved Road Bike / Performance Road. Where it measures differently: top_tube_effective is its top_tube_length_center_center. Trail is left null: Bike Insights computes its own and the maker's is not on the page. Not checked against the maker's archived page: web.archive.org blocked this machine on 22 Oct 2026; a later pass should read the capture and upgrade this file to the maker's numbers. The maker's current page for this frame, https://www.hongfu-bikes.com/products/9.html ("2021 Aero disc road frame FM339", fetched 22 Oct 2026, HTTP 200), is live but carries no geometry: one cable-routing render and a short spec (full hidden internal cable design, full carbon, fork axle M15*P1.5/M12-P1.5, frame axle M12, Shimano flat mount disc, sizes 49/52/54/56/58cm, tire 700*28C). The geometry Bike Insights holds came from the older page it cites (Hongfu's earlier site layout), which a later pass could read in the archive.