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.
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 Most makers do not publish it, so I assume 10 mm and add 6 mm to the band beside every answer.
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 hands sit than your saddle. On a riser bar I count the bar's rise, so the drop is that much less than it is to the clamp.
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.
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.
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.
Close Escape closes it. The measuring guide has the pictures. Open the measuring guide
Colnago V3
Road · 8 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
- Colnago V3 · Road · 8 sizes
- Geometry
- 139650070.fs1.hubspotusercontent-eu1.net, fetched 20 Oct 2026, read off the maker's chart, re-checked, no differences
- Seat angle convention
- Calculated from Colnago's 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 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)not published | Standover (mm)not published |
|---|---|---|---|---|---|---|---|---|
| 42s | 514 | 368 | 70.6 | 75.5 | 113 | 408 | ||
| 45s | 520 | 375 | 71 | 75 | 114 | 408 | ||
| 48s | 525 | 380 | 71.5 | 74.5 | 117 | 408 | ||
| 50s | 542 | 382 | 71.6 | 74 | 132 | 410 | ||
| 52s | 560 | 384 | 71.9 | 73.57 | 151 | 410 | ||
| 54s | 578 | 390 | 72.5 | 73.1 | 168 | 414 | ||
| 56s | 586 | 400 | 72.9 | 73 | 175 | 414 | ||
| 58s | 604 | 408 | 73.1 | 73 | 193 | 414 |
The table runs on to the right: 6 more columns after Reach. Scroll it sideways to read them.
The 52s 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. A dashed tube is a number the maker left out (est.).
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: 139650070.fs1.hubspotusercontent-eu1.net- 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
In the maker's words
Kept whole, as I read it off 139650070.fs1.hubspotusercontent-eu1.net.No cockpit is named in the chart; the V3 has no current product page.
Cockpit and seatpost, in the maker's words · 14 words
No cockpit is named in the chart; the V3 has no current product page.
OFFICIAL SOURCE: Colnago's geometry chart https://139650070.fs1.hubspotusercontent-eu1.net/hubfs/139650070/Geometrie%20schede/V3-SIZES%20(1).pdf (hosted by Colnago, no current product page). Source: image_table in a pdf (official Colnago geometry chart "V3-SIZES (1).pdf", hosted by Colnago: the PDF holds the chart as a picture with no text layer, so every number was read by eye at full resolution; image and PDF NOT stored; fetched 2026-10-20
How I read the maker's table
Column mapping: fork (fork length, axle to crown) not in the schema; Sc -> seat_tube_angle; A (BB centre to front axle) -> front_centre; C -> chainstay; Hs -> head_tube_length; Ss -> head_tube_angle; bbdrop -> bb_drop; O (top tube, drawn horizontal from the head tube top to the seat tube line) -> top_tube_effective; Stack; Reach. Size labels as printed (42s, 45s, 48s, 50s, 52s, 54s, 56s, 58s). DRAWING (read only for its letters and datums, not stored): Stack and Reach are drawn from the BB centre to the top of the head tube (no headset cover named, so stack_datum is null); O is drawn horizontal from the head tube top to the seat tube line; the size is drawn along the seat tube from the BB centre to its top. Not published, so null: wheelbase, standover, trail, fork rake, seat tube length, stock stem, stock bar. SOURCE: the chart PDF is hosted by Colnago in the same "Geometrie schede" folder as the current charts and listed in the colnago.com site data, but no current product page links it. Sizes printed 42s to 58s. The 52s seat angle is printed "73,57" (recorded as 73.57, as printed). The chart prints no seat tube length, rake, trail or wheelbase. model_year 2019 is the Bike Insights version; the maker prints none.
Source: image_table in a pdf (official Colnago geometry chart "V3-SIZES (1).pdf", hosted by Colnago: the PDF holds the chart as a picture with no text layer, so every number was read by eye at full resolution; image and PDF NOT stored; fetched 2026-10-20, HTTP 200)