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 Most makers do not publish it, so I assume 10 mm and add 6 mm to the band beside every answer.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.
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
Colnago C68 Allroad
All-road · 6 sizes
The C68 Allroad on colnago.com
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This is the bike I ride
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- Bike
- Colnago C68 Allroad · All-road · 6 sizes · integrated cockpit
- Geometry
- colnago.com, fetched 20 Oct 2026, 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 |
|---|---|---|---|---|---|---|---|---|
| 430 | 523 | 370 | 70.6 | 75.5 | 117 | 412 | ||
| 460 | 543 | 375 | 71 | 75 | 136 | 412 | ||
| 490 | 563 | 380 | 71.5 | 74.5 | 157 | 415 | ||
| 520 | 583 | 386 | 72 | 74 | 177 | 415 | ||
| 550 | 603 | 393 | 72.5 | 73.5 | 198 | 417 | ||
| 580 | 623 | 400 | 72.5 | 73 | 219 | 417 |
The table runs on to the right: 6 more columns after Reach. Scroll it sideways to read them.
The 520 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.Colnago CC.01Vendor-listedstem -8 · reach 80 · drop 122 · lengths 80-130 · widths 370-430
Stock stem and bar per size430 90 x 390, 460 100 x 390, 490 110 x 390, 520 110 x 410, 550 120 x 430 (stem length x bar width, mm)
Frame facts
read from the maker's words, not a table: colnago.com- Tyre clearance
- 35 mm
- 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 colnago.com.The page lists "Handlebar: Colnago CC.01 integrated Cockpit - regular geometry." and "Stem: CC01 integrated cockpit".
Cockpit and seatpost, in the maker's words · 92 words
The page lists "Handlebar: Colnago CC.01 integrated Cockpit - regular geometry." and "Stem: CC01 integrated cockpit". Colnago CC.01 (https://139650070.fs1.hubspotusercontent-eu1.net/hubfs/139650070/Geometrie%20schede/COLNAGO_CC01_tech.pdf, the page's handlebar size guide): an integrated one-piece cockpit; stem angle -8 deg (drawn as 82 deg between stem and steerer); stem lengths 80/90/100/110/120/130 mm; bar reach 80 mm; drop 122 mm (printed "122,00"); widths 370/390/410/430 mm (the drawing's WIDTH, across the tops); sold as handlebar/stem pairs "370 80, 370 90, 390 90, 410 90, 390 100, 410 100, 390 110, 410 110, 430 110, 390 120, 410 120, 430 120, 410 130".
OFFICIAL SOURCE: Colnago's C68 Allroad page (https://www.colnago.com/en-us/premium-bikes/c68-allroad-bike/technical-specifications) and the geometry chart it links, https://139650070.fs1.hubspotusercontent-eu1.net/hubfs/139650070/Geometrie%20schede/C68%20Allroad%20sloping%20guide%20to%20the%20sizes%20(1).pdf. Source: pdf (official Colnago geometry chart "C68 Allroad sloping guide to the sizes (1).pdf", linked from the model page as its size guide; the table read from the PDF's text layer by script; fetched 2026-10-20
How I read the maker's table
Column mapping: Cf (the size: seat tube from the BB centre along the tube to its top) -> seat_tube_length; Fork (fork length, axle to crown) not in the schema; Rake -> fork_offset; 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 (430, 460, 490, 520, 550, 580). 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. stock_stem_length and stock_bar_width are the page's per-size "Default stem length" and "Default handlebars width" (430 90/390; 460 100/390; 490 110/390; 520 110/410; 550 120/430; 580 None/None). Not published, so null: wheelbase, standover, trail. THE PAGE AGAINST THE CHART: the page's own size tabs print 45 of these cells; 1 differ, and the chart is kept (it is the table the page offers as its size guide): 520 BB drop: page tab "72 mm", chart 74. The chart has six sizes (430 to 580); the page's size tabs show five (430 to 550). The page says the C68 Allroad has "space for tyres up to 35 mm". Model year is not printed (null).
Source: pdf (official Colnago geometry chart "C68 Allroad sloping guide to the sizes (1).pdf", linked from the model page as its size guide; the table read from the PDF's text layer by script; fetched 2026-10-20, HTTP 200)