Stack and reach
How high and how far forward the top of the head tube is, from the bottom bracket. They are the two numbers that decide whether a frame can be set up like yours.
BB, or bottom bracket
The axle your cranks turn on, in the middle of the frame. Every number on this site is measured from it, because it is the one point that sits in the same place on every bike.
Headset cover
The little cap on top of the head tube, under your spacers. Most makers do not publish it, so I assume 15 mm and add 6 mm to the band, which on its own is enough to hold an answer at "probably" rather than "fits".
Stem clamp, and its centre
The collar on the steerer that your stem bolts to. I need the middle of it. Where a maker gives only the height, I assume halfway up and say so on the answer.
Steerer
The tube coming up out of the fork. The cover, the spacers and the stem all sit on it, and it is the thing a mechanic cuts to length.
Bar reach
How far forward the hoods sit from the middle of the bar. Two bars on the same stem can put your hands 20 mm apart, which is why I ask.
Setback
How far your saddle sits behind the bottom bracket.
Drop
How much lower your bar is than your saddle.
Rails, and the rail centre
The two rods under your saddle, and the middle of the straight part of them. That midpoint is the point I use, because it is the one you can find with a tape.
The band
How far out I could be, in millimetres, and why. It is a straight sum of everything I had to assume rather than a clever average, so it errs wide on purpose.
wb, stand, trail
Wheelbase, standover and trail: how long the bike is, how high the top tube is where you straddle it, and how steady the steering feels. I show them against your bike, and I leave them out when the maker does not publish them.
est.
Estimated: a number I worked out rather than read off the maker's table. Anything marked this way can move if the maker publishes the real one.
Close Escape closes it. The measuring guide has the pictures. Open the measuring guide
Hongfu FM169-F
Aero road · 5 sizes
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This is the bike I ride
No account is needed to read the table. Report a wrong number · Correct this bike
- Bike
- Hongfu FM169-F · Aero road · 5 sizes
- Geometry
- hongfu-bikes.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)not published |
|---|---|---|---|---|---|---|---|---|
| 470 (47 cm) | 493.5 | 362.8 | 69.5 | 73.5 | 100 | 415 | 978.7 | |
| 500 (50 cm) | 512.1 | 376.3 | 72 | 73.5 | 110 | 415 | 976.2 | |
| 530 (53 cm) | 533 | 391.1 | 72.8 | 73.5 | 130 | 415 | 987.3 | |
| 560 (56 cm) | 551.1 | 396.8 | 73.3 | 73.5 | 147 | 415 | 997.5 | |
| 580 (58 cm) | 569.9 | 403.2 | 73.3 | 73.5 | 165 | 415 | 1009.6 |
The table runs on to the right: 6 more columns after Reach. Scroll it sideways to read them.
The 530 (53 cm) 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 hongfu-bikes.com.NOT published.
Cockpit and seatpost, in the maker's words · 139 words
NOT published. The maker's page (HongFu Sports Equipment / Shenzhen Hongfu Sports Goods Co., Ltd) describes the frame only: 'NEW DISC BRAKE AERO ROAD FRAME FM169-F, Item HF-FM169-F, 2022 AERO disc brake road frame new design, Material Toray T800, Available sizes 47/50/53/56/58cm, BB BB86/BSA, Maximum tire 700*28C, Rear axle 142*12mm, Front axle 100*12mm, Brake: Fork 140/160MM mount, Frame 140/160mm'. Title calls it 'Full internal cabel routing disc brake road frame' but no handlebar, stem, headset, spacer or top-cap details are given, and whether a bar/stem is included is not stated (integrated_cockpit left null). Seatpost: the geometry drawing shows a proprietary aero-profile seatpost with a wedge clamp at the top tube / seat tube junction; seatpost length and offset are NOT published. Fork: full-carbon disc fork, length (I in the drawing) 368 mm axle-to-crown, offset (K) 45 mm, all sizes.
Geometry read by eye from the maker's own drawing image http://www.hongfu-bikes.com/upload/image/20220413/1649821869683858.jpg (840x639 JPEG embedded in the product overview, captioned 'FM169-F-几何图' = FM169-F geometry drawing. Source: image_table
How I read the maker's table
table upscaled 3x to read). STACK DATUM: D is drawn from the BB centre vertically to the horizontal through the top of the head tube, C horizontally from the BB vertical to the head tube top centre - the usual stack/reach convention. H = front centre was confirmed rather than assumed: sqrt(H^2 - drop^2) + sqrt(RC^2 - drop^2) reproduces the published wheelbase to within 0.1 mm on every size, and reach + stack / tan(STA) reproduces B to within 0.1 mm on every size, so the table is internally consistent as read. Size names: the table uses 470/500/530/560/580 and the text says 47/50/53/56/58cm; the size_label carries both. Standover and trail are NOT published (left null; do not import derived values). Weight per size (frame, published): 47cm 1069+-40 g, 50cm 1072+-40 g, 53cm 1087+-40 g, 56cm 1107+-40 g, 58cm 1127+-40 g. Model year: the description opens '2022 AERO disc brake road frame new design' and the page was published 2022-04-13; the og:url on the page points at /products/roadbike/19.html and the article link at /case/19.html, all the same record. The road bike category listing on the maker's site (https://www.hongfu-bikes.com/products/roadbike/) has only this one FM169-F entry. No aggregator was consulted.