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 Most makers do not publish it, so I assume 10 mm and add 6 mm to the band beside every answer.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 Y1Rs
Road · 5 sizes
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This is the bike I ride
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- Bike
- Colnago Y1Rs · Road · 5 sizes · integrated cockpit
- Geometry
- colnago.com, fetched 20 Oct 2026, re-checked, no differences
- 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.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. 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: colnago.com- 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 colnago.com.The page lists "Handlebar: Colnago CC.Y1 integrated Cockpit - regular geometry." and "Stem: CCY1 integrated cockpit".
Cockpit and seatpost, in the maker's words · 72 words
The page lists "Handlebar: Colnago CC.Y1 integrated Cockpit - regular geometry." and "Stem: CCY1 integrated cockpit". Colnago CC.Y1 (https://a.storyblok.com/f/263970/x/d1b052dc76/colnago_ccy1_tech.pdf, the page's handlebar size guide): an integrated cockpit sold as stem/hood width "95/377 95/397 105/377 105/397 115/377 115/397 125/377 125/397 135/377 135/397", i.e. stem lengths 95/105/115/125/135 mm; bar reach 79 mm; drop 130 mm; hood widths 377/397 mm, drop widths 400/420 mm (the chart's "Drop width (flare)"). The chart prints no stem angle.
OFFICIAL SOURCE: Colnago's Y1Rs page (https://www.colnago.com/en-us/premium-bikes/y1rs-road-bike/technical-specifications) and the geometry chart it links, https://a.storyblok.com/f/263970/x/cc0b8e2ff1/scheda-a4-colnago-y1rs.pdf. Source: pdf (official Colnago geometry chart "scheda-a4-colnago-y1rs.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: Ss -> head_tube_angle; Sc -> seat_tube_angle; Reach; Stack; "Fork lenght" (as printed; fork length) not in the schema; Rake -> fork_offset; "Trail (28-622 tyre)" -> trail; Hs -> head_tube_length; C -> chainstay; A (BB centre to front axle) -> front_centre; BB drop -> bb_drop. Size labels as printed (XS, S, M, L, XL). 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, seat tube length, top tube, stock stem, stock bar. THE PAGE AGAINST THE CHART: the page's own size tabs print 50 of these cells; every one agrees with the chart. Trail is printed for a 28-622 tyre (tyre_width_mm 28). Fork rake varies by size (55, 49.5, 45, 42.5, 42.5). Seatpost "Carbon seatpost, 0 or 15 offset mm," as printed (posts [0, 15] on every size). Model year is not printed (null).
Source: pdf (official Colnago geometry chart "scheda-a4-colnago-y1rs.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)