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 Most makers do not publish it, so I assume 15 mm and add 6 mm to the band, which on its own is enough to hold an answer at "probably" rather than "fits".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
Velobuild GF-005
Gravel · 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
- Velobuild GF-005 · Gravel · 5 sizes · integrated cockpit
- Geometry
- velobuild.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.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 velobuild.com.The frameset (USD 479 on the page, 2026-08-29) is ordered with a cockpit chosen in the order form.
Cockpit and seatpost, in the maker's words · 337 words
The frameset (USD 479 on the page, 2026-08-29) is ordered with a cockpit chosen in the order form. The maker's description block (HANDLEBAR: full carbon, 380 g) lists the integrated one-piece bar/stem as 400/90, 400/100, 420/100, 420/110, 440/110, 440/120 mm (width/stem length), or "Separate bar and stem" with bar 400 / 420 / 440 mm and stem 80 / 90 / 100 / 110 / 120 mm. The live order form offers more integrated combinations than the description: "Integrated bar size" 380/90, 380/100, 400/90, 400/100, 420/100, 420/110, 440/110, 440/120, 380/110, 420/90, 400/110 mm or "Separate Bar Stem"; "Bar Size" 400 / 420 / 440 mm (or "Integrated Bar"); "Stem Size" 80 / 90 / 100 / 110 / 120 mm (or "Integrated Bar"). No size-to-cockpit default is published, so stock_stem_length and stock_bar_width are null. NOT published on the page: stem angle, bar reach, bar drop, bar flare, stem/clamp stack height, spacer heights, maximum spacer stack, headset top cap height. Headset bearings: 1-1/2 x 7 mm lower and upper (the maker's wording; the frame is "full integrated cable routing" through the headset, and the page carries a note about a "New C Ring with Chip to Solve Headsets Play"). Fork: full carbon, 420 g, offset 50 mm, steerer tube length 300 mm, flat mount, thru axle M12 x 1.5 x 130 mm, max rotor 180 mm, max tyre 700C x 50C. Seatpost: full carbon, 230 g without metal parts, 400 mm long, aero profile, "single bolt pivot precise adjustment", ordered as "0 Setback" or "20mm Setback"; saddle clamp 7 x 7 mm rail, with a 7 x 9 mm clamp for carbon rails included; seat clamp integrated in the frame. Frame: full carbon, 1020 g (size M, clear coat, without metal parts), T47 threaded bottom bracket (ID 46 mm, width 86.5 mm), flat mount, rear thru axle M12 x 1.5 x 163 mm, max rotor 160 mm, max tyre 700C x 50C, UDH rear hanger (page heading), Di2 and eTap compatible, finish matte or glossy plus paint options.
SOURCE: maker's own product page (VeloBuild, ueeshop storefront), fetched 2026-08-29 with HTTP 200 (214,783 bytes). Source: image_table (maker's page publishes the geometry only as a picture
How I read the maker's table
The page has no HTML geometry table; the Description tab is a run of images and the geometry is one of them (GEOMETRY.jpg, CDN path dated 2025-03-09). The page's JSON-LD gives productID / sku / mpn "GF-005", brand "VeloBuild", price USD 479. MODEL YEAR: 2025 is the maker's own naming (page title "2025 VeloBuild Carbon Fiber Racing Gravel Bike Frame", URL slug the same, product image CDN paths dated 2025-04-23); the page is still live and selling on 2026-08-29 with a customer review dated 2026-08-13. TABLE LAYOUT: one row per size (XS, S, M, L, XL), columns lettered A-K on the diagram: A "BB center to top of" (header cut short; the diagram's A runs along the seat tube from the BB centre to the top of the seat tube) -> seat_tube_length; B "Effective top tube" -> top_tube_effective; C "BB offset" printed as -75 for every size -> bb_drop recorded as 75 (the minus sign is the maker's convention for a BB below the axle line, i.e. a drop); D "Chainstay length" -> chainstay; E "Seat angle" (degrees) -> seat_tube_angle; F "Head angle" (degrees) -> head_tube_angle; G "WB length" -> wheelbase; H "Head tube" -> head_tube_length; I "Fork offset" -> fork_offset (50 mm every size, matching the fork spec); J "Reach" -> reach; K "Stack" -> stack. All lengths in mm as printed. STACK DATUM: per the diagram, K (stack) is the vertical and J (reach) the horizontal distance from the BB centre to the top centre of the head tube; no headset cap or cover is included in the drawing. NOT PUBLISHED (null): standover, front centre, trail, stock stem length, stock bar width. Sizing guide: none on the page (the size selector is just XS/S/M/L/XL). Frame-size sanity: stack-to-reach 1.43 / 1.40 / 1.41 / 1.42 / 1.43; wheelbase minus chainstay gives an implied front centre of 581 / 602 / 618 / 639 / 660 (derived, so not stored).
Source: image_table (maker's page publishes the geometry only as a picture: https://ueeshop.ly200-cdn.com/u_file/UPBA/UPBA916/2503/09/photo/GEOMETRY.jpg, 950x860 px, titled "GEOMETRY AERO GRAVEL BIKE FRAMESET", diagram plus table; numbers read by eye from the image at 2x zoom, image not stored)
