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 Most makers do not publish it, so I assume 10 mm and add 6 mm to the band beside every answer.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
Cannondale Topstone CAAD
Gravel · 6 sizes
The Topstone CAAD on cannondale.com
Sign in and add the bike you ride, and this table will say what each size needs for your position.
Sign in
This is the bike I ride
No account is needed to read the table. Report a wrong number · Correct this bike
- Bike
- Cannondale Topstone CAAD · Gravel · 6 sizes
- Geometry
- cannondale.com, fetched 20 Oct 2026, read off the maker's chart, 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.| Size | Stack (mm) | Reach (mm) | Head angle (deg) | Seat angle (deg) | Head tube (mm) | Chainstay (mm) | Wheelbase (mm) | Standover (mm) |
|---|---|---|---|---|---|---|---|---|
| 47 | 535 | 365 | 69.9 | 73.1 | 87 | 435 | 1018 | 705 |
| 51 | 560 | 373 | 70.7 | 73.1 | 110 | 435 | 1028 | 737 |
| 54 | 579 | 378 | 70.7 | 73.1 | 133 | 435 | 1041 | 767 |
| 56 | 597 | 383 | 70.7 | 73.1 | 152 | 435 | 1052 | 797 |
| 58 | 615 | 389 | 70.7 | 73.1 | 174 | 435 | 1066 | 828 |
| 61 | 645 | 397 | 70.7 | 73.1 | 206 | 435 | 1084 | 861 |
The table runs on to the right: 6 more columns after Reach. Scroll it sideways to read them.
The 56 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.
Stock stem and bar per size47 70 x 400, 51 70 x 400, 54 80 x 420, 56 90 x 420, 58 90 x 420, 61 100 x 440 (stem length x bar width, mm)
Frame facts
read from the maker's words, not a table: cannondale.com- Tyre clearance
- not recorded yet
- Bottom bracket
- not recorded yet
- Axles and brakes
- not recorded yet
- UDH
- not recorded yet
- Seatpost
- 27.2 mm round
- Frame weight
- not recorded yet
In the maker's words
Kept whole, as I read it off cannondale.com.Two-piece cockpit on the Topstone CAAD 1 GRX 2x: handlebar "Cannondale 3, butted 6061 Alloy, 16 deg flare, 120mm drop: 400mm (47-51cm), 420mm (54-58cm), 440mm (61cm)"; stem "Cannondale C1 Conceal, Alloy, 31.8, -6 deg: 70mm (47-51m), 80mm (54cm), 90mm (56-58cm), 100mm (61cm)" ("47-51m" sic).
Cockpit and seatpost, in the maker's words · 63 words
Two-piece cockpit on the Topstone CAAD 1 GRX 2x: handlebar "Cannondale 3, butted 6061 Alloy, 16 deg flare, 120mm drop: 400mm (47-51cm), 420mm (54-58cm), 440mm (61cm)"; stem "Cannondale C1 Conceal, Alloy, 31.8, -6 deg: 70mm (47-51m), 80mm (54cm), 90mm (56-58cm), 100mm (61cm)" ("47-51m" sic). Fork "1-1/8" to 1.5" steerer" (round, not the Delta steerer). Seatpost "Cannondale 3, 6061 Alloy, 27.2x350mm" (offset not printed).
OFFICIAL SOURCE: Cannondale GB product page for the Topstone CAAD 1 GRX 2x (SalsifyId 1070-COLL2027, ModelYear 2027 in the product data feed. Source: image_table (official Cannondale GB product page, "Geometry" section is a single image
How I read the maker's table
the image file is named cy26 and sits in the my27 folder). The data feed carries Geometry null for every variant, so the image is the only table. The GB range also sells the Topstone CAAD 2/3 CUES 1x, the EQ, the Lefty build and a flat-bar build on the same frame; the flat-bar build is not a drop-bar bike and is not the reason for this file. SIZE LABELS: the table header prints 47.0/51.0/54.0/56.0/58.0/61.0; the shop's size selector says 47/51/54/56/58/61, which is what size_label holds. UNITS: lengths printed in centimetres to one decimal; every length here is the printed value x 10, angles as printed. The diagram draws a Q (axle to crown) but the table has no Q row. STACK DATUM: O is drawn to a horizontal through the top of the head tube where G starts. tyre_width_mm 45 is the Topstone CAAD 1's stock tyre ("WTB Vulpine TCS Light, 700x45c"), not a table number. stock_stem_length and stock_bar_width are that build's stem and bar per frame size.
Source: image_table (official Cannondale GB product page, "Geometry" section is a single image: https://www.cannondale.com/-/media/images/my27/bikes/road/gravel/topstone-caad/pdp/cy26_topstonecaad_geotable.ashx, 2000x2992 px, diagram + table headed "Topstone CAAD"; numbers read from the image by the collector, image NOT stored)