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 Most makers do not publish it, so I assume 15 mm and add 6 mm to the band, which on its own is enough to hold an answer at "probably" rather than "fits".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
Dengfu R01 Ultralight
Road · 7 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
- Dengfu R01 Ultralight · Road · 7 sizes
- Geometry
- dengfubike.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 |
|---|---|---|---|---|---|---|---|---|
| 48cm | 508 | 374 | 71 | 74.5 | 110 | 405 | 972 | |
| 50cm | 517 | 381 | 72 | 74.5 | 115 | 405 | 973 | |
| 52cm | 523.5 | 384 | 72.5 | 74 | 120 | 405 | 975 | |
| 54cm | 541 | 385 | 73 | 73.5 | 136 | 405 | 975 | |
| 56cm | 578 | 394.5 | 73 | 73.5 | 155 | 405 | 990 | |
| 58cm | 579 | 398 | 73.5 | 73 | 175 | 405 | 995 | |
| 60cm | 598 | 401.5 | 73.5 | 72.5 | 195 | 405 | 1004 |
The table runs on to the right: 6 more columns after Reach. Scroll it sideways to read them.
The 54cm 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 size48cm 80 x 400, 50cm 90 x 400, 52cm 100 x 420, 54cm 100 x 420, 56cm 100 x 420, 58cm 110 x 440, 60cm 120 x 440 (stem length x bar width, mm)
In the maker's words
Kept whole, as I read it off dengfubike.com.CONVENTIONAL two-piece cockpit (round steerer, no integrated bar).
Cockpit and seatpost, in the maker's words · 262 words
CONVENTIONAL two-piece cockpit (round steerer, no integrated bar). The frameset "Include" line reads "frame, fork, seatpost, seat clamp, headset" - no handlebar or stem is included. The geometry table carries two cockpit rows, HB (handlebar width) 400 / 400 / 420 / 420 / 420 / 440 / 440 and STEM (length) 80 / 90 / 100 / 100 / 100 / 110 / 120 for 48 / 50 / 52 / 54 / 56 / 58 / 60 cm, footnoted by the maker: "*The size of the HANDLEBAR (HB) and STEM is optional according to your requirement. If need, please note when placing the order." - so they are the maker's size-matched defaults for a bar and stem added to the order, not a fixed spec. No bar reach/drop, stem angle, stem clamp height, spacer heights or maximum spacer stack are published for the frameset. The complete-bike listing (https://www.dengfubike.com/products/r01) fits an aluminium handlebar and stem on the Sensah Empire build and a "TORAY T700 carbon fiber" handlebar and stem on the Ultegra R8000 and Dura-Ace Di2 R9150 builds, with no dimensions stated; cranks are 170 mm on the Sensah build and 172.5 mm on the Shimano builds. Headset: head tube "Tapered, 1 1/8"-1 1/2"", headset included (the complete bike names it NECO); bearing sizes and top cover height not published. Seatpost: "TORAY T800 carbon fiber, 27.2mm diameter, 350mm", round; offset/setback not published. Seat clamp included. Fork: full carbon, fork length (axle to crown, table row E) 370 mm on every size; fork offset not published. Rim brake only, max tyre 700x25C.
TABLE AS PUBLISHED: columns SIZE 48cm / 50cm / 52cm / 54cm / 56cm / 58cm / 60cm. Source: html_table (maker's own Shopify store, GEOMETRY tab is a real HTML table; the letter legend was read from the geometry diagram image
How I read the maker's table
rows A, REACH, STACK, B, C, D, E, F, H, I, J, FC, WB, HB, STEM. The same table (every cell identical) appears on three maker pages: the frameset page (source_url), the dedicated page https://www.dengfubike.com/pages/r01-geometry and the complete-bike page https://www.dengfubike.com/products/r01. LEGEND: the letters are defined only by the geometry diagram image (no text legend anywhere on the site). STACK DATUM: the diagram draws STACK vertically from the BB centre to a horizontal line at the TOP OF THE HEAD TUBE (frame, no headset cap), and REACH horizontally from the BB centre vertical to the same point - the standard datum. SIZE NAMES: 48cm to 60cm are nominal labels; they match neither A (465-585), B (420-540) nor C (515-590), so they are recorded as labels only. Degrees: the site prints the angle cells with the ordinal symbol (e.g. "72.5º"); numbers only are recorded. Standover, fork offset and trail are not published - null. CONSISTENCY: FC, J and H reproduce WB on every size to within 0.5 mm (e.g. 48cm sqrt(577^2-69^2)+sqrt(405^2-69^2) = 972.0). PROBABLE MAKER TYPO, kept as published: 56cm STACK is printed 578, only 1 mm below the 58cm value (579) and 37 mm above the 54cm value (541), while the head tube grows 19 mm from 54 to 56 at 73 deg (about +18 mm stack) and 20 mm from 56 to 58 at 73.5 deg (about +19 mm); the frame's own reach, head tube and front centre steps are consistent with a 56cm stack of about 558-559, so 578 looks like a 5/7 digit slip. 578 is stored because it is what the maker publishes; treat the 56cm stack with care until Dengfu corrects it. CATEGORY: the maker's own navigation files the R01 under Road > Climb (collection carbon-climb-road-bikes, members R01, R02, R02 DISC) and the R01 highlights page headline is "HILL CLIMBING GEOMETRY ... The slightly slack seat tube angle and short wheel wheelbase provide excellent control during hill climbing." FRAME FACTS (spec table): Toray T800 carbon, frame weight (no fork) 850 +/- 45 g, rim brake, internal cable routing, Di2 compatible, brazed-on front derailleur mount, BB options BSA / BB30 / PF30, max tyre 700x25C, finish UD matt or glossy, USD 550, and the maker's line "Ultralight version and regular version in random shipping." MODEL YEAR: the table is undated; the frameset product record was created 2019-07-29 (Shopify created_at), the geometry image is versioned 2019-08-29 (v=1567042861), the complete-bike record dates from 2019-06-06; the listing was live and unchanged on 2026-08-29, so model_year is null with 2019 as the first-published year.
Source: html_table (maker's own Shopify store, GEOMETRY tab is a real HTML table; the letter legend was read from the geometry diagram image https://cdn.shopify.com/s/files/1/0245/4929/4185/files/R01_GEOMETRY_2048x1148_887b17d4-d2c2-42fa-b546-b5b131a7beff_2048x2048.png on the same page, image NOT stored)
