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 Most makers do not publish it, so I assume 15 mm and add 6 mm to the band, which on its own is enough to hold an answer at "probably" rather than "fits".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 VB-R-268
Aero road · 5 sizes
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- Bike
- Velobuild VB-R-268 · Aero road · 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 frame is sold with a choice of cockpit picked in the order form: "Integrated bar size" (one-piece carbon bar/stem, width/stem length) 380/90, 380/100, 400/90, 400/100, 420/100, 420/110, 440/110, 440/120 mm, or "Separate Bar Stem" with Bar Size 400 / 420 / 440 mm and Stem Length 90 / 100 / 110 / 120 mm.
Cockpit and seatpost, in the maker's words · 231 words
The frame is sold with a choice of cockpit picked in the order form: "Integrated bar size" (one-piece carbon bar/stem, width/stem length) 380/90, 380/100, 400/90, 400/100, 420/100, 420/110, 440/110, 440/120 mm, or "Separate Bar Stem" with Bar Size 400 / 420 / 440 mm and Stem Length 90 / 100 / 110 / 120 mm. The maker's spec-sheet image (SPECDETAIL268.jpg, HANDLEBAR block) lists the integrated bar as 400/90, 400/100, 420/100, 420/110, 440/110, 440/120 mm (no 380 width) and the separate bar and stem as bar 400/420/440 mm, stem 80/90/100/110/120 mm (an 80 mm stem the live order form does not offer); handlebar full carbon, 380 g, clamp torque 5.0 Nm. No per-size default bar or stem is stated, so stock_stem_length and stock_bar_width are null. Stem angle, bar reach, bar drop, bar clamp height, headset top cap height and maximum spacer stack are NOT published. Headset bearings: 1-1/2 x 7 mm upper and lower (spec sheet; the detail image says "Headsets Up & Lower 1-1/2"). Fork steerer tube length 300 mm, fork offset 45 mm, fork 410 g. Seatpost: proprietary aero (D-shape style) carbon post, length 350 mm, ZERO setback (only offset offered), single bolt pivot clamp, 7x7 mm rail clamp with a 7x9 mm carbon-rail clamp included, torque 8.0 Nm, 230 g without metal parts (page header says seat post 180 g). Seat clamp integrated into the frame, torque 5.0 Nm.
SOURCE: maker's own product page (VeloBuild Ltd, Shenzhen. Source: image_table (maker's page publishes the geometry only as a picture
How I read the maker's table
ueeshop storefront), fetched 2026-08-29 with HTTP 200. The page has no HTML geometry table; the Description tab is a run of images and the geometry is one of them (268-GEOMETRY-2.jpg, 950x820, CDN path dated 2023-12-28). Numbers were read from the image at 3x zoom and every cell checked twice. TABLE LAYOUT: header "SIZE IN(mm)", columns XS S M L XL, rows A-M lettered on a diagram: A "BB CENTER TO TOP OF SEATTUBE" -> seat_tube_length; B "EFFECTUVE TIO TUBE HORIZONTA" (sic, effective top tube horizontal) -> top_tube_effective; C "BB OFFSET" printed as -72 on every size -> recorded as bb_drop 72 (positive = BB below the axle line, matching the other files; the maker's minus sign is its sign convention, not a rise); D "CHAINSTAY LENGTH"; E "SEAT ANGLE"; F "HEAD ANGLE"; G "FRONT CENTER" -> front_centre; H "HEAD TUBE LENGTH"; I "FORK OFFSET"; J "REACH"; K "STACK"; M "STANDOVER HEIGHT" (there is no row L). STACK DATUM: not stated in words; the diagram draws K vertically from the BB centre to the top of the head tube and J horizontally from the BB centre to the same point, i.e. the usual BB-centre to head-tube-top convention; no headset cap is included. NOT PUBLISHED (null): wheelbase, trail, per-size stock bar and stem. Angles are printed with a degree sign (71.75 deg for XS is as printed). SIZE NAMES: XS/S/M/L/XL only; the maker gives no rider-height guide on this page. FRAME FACTS from the spec-sheet image (SPECDETAIL268.jpg, CDN path dated 2025-08-11, so the sheet post-dates the 2024 launch): full carbon, T800 mixed T1000 (page header), EPS + latex moulding, frame 1000 g size M clear coat without metal parts (page header says frame M 950 g), integrated seat clamp, flat mount brakes, press fit BB86 (ID 41 mm, width 86.5 mm), Di2 and eTap (electronic only) compatible, full integrated cable routing, Mavic Speed Release thru axles front and rear, max tyre 700c x 32c, max rotor 160 mm. Finish options glossy or matte, UD carbon or custom paint. MODEL YEAR 2024 from the page title ("VeloBuild 2024 VB-R-268"); the geometry image itself is undated. Reprints NOT used for numbers.
Source: image_table (maker's page publishes the geometry only as a picture: https://ueeshop.ly200-cdn.com/u_file/UPBA/UPBA916/2312/28/photo/268-GEOMETRY-2.jpg, titled "GEOMETRY R-268 ROAD FRAMESET DISC BRAKE"; numbers read by eye from the image, image not stored)
