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 Most makers do not publish it, so I assume 10 mm and add 6 mm to the band beside every answer.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
Cosmosworks Oi!
Gravel · 4 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
- Cosmosworks Oi! · Gravel · 4 sizes
- Geometry
- cosmosebike.com, fetched 21 Oct 2026, re-checked, no differences
- Seat angle convention
- Calculated from Cosmosworks' 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
- 23 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 L 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.
Frame facts
read from the maker's words, not a table: cosmosebike.com- Tyre clearance
- 40 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 cosmosebike.com.Not published on the page (bar and stem not specified).
Cockpit and seatpost, in the maker's words · 20 words
Not published on the page (bar and stem not specified). Stock stem and bar per size are not published (null).
SOURCE: cosmosebike.com is Cosmosworks' own site (Chinese e-bike brand. Source: html table (maker's own site cosmosebike.com, "FIT & GEOMETRY" HTML table with the letter keys drawn on
How I read the maker's table
the Oi! is its non-assisted carbon aero gravel bike, "Toray T800 / T1000 carbon fiber | 15 mounting points | e-bike conversion", 6-7 kg complete, 40 mm tyre clearance). I am taking this to be the "Cosmo" of my list; that match is my guess. Letter keys read from the drawing: Cf seat tube (BB to top of seat tube, seat_tube_length), O top tube (drawn horizontal, top_tube_effective), Hs head tube, Ss deg head angle, Sc deg seat angle, C chainstay, WB, BB Drop, Fork Rake (fork_offset), Fork (length). Rows not in the schema: Recommended Rider Height 159-170cm / 168-176cm / 176-182cm / 182-190cm; Fork Length 400 / 400 / 400 / 400. The top tube closes on reach plus stack over tan of the seat angle to 0.1 mm on every size. STACK DATUM: not stated; head tube top assumed. MODEL YEAR: not printed (null). No Panda Podium, Geometry Geeks or 99 Spokes request was made.
Source: html table (maker's own site cosmosebike.com, "FIT & GEOMETRY" HTML table with the letter keys drawn on https://cosmosebike.com/assets/en/oi-geometry.webp; parsed from the raw HTML)
