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 Most makers do not publish it, so I assume 10 mm and add 6 mm to the band beside every answer.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
XMCS CS-GR01
Gravel · 6 sizes
Sign in and add the bike you ride, and this table will say what each size needs for your position.
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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
- XMCS CS-GR01 · Gravel · 6 sizes
- Geometry
- xmcarbonspeed.com, fetched 22 Oct 2026, read off the maker's chart, re-checked, no differences
- Seat angle convention
- Calculated from XMCS' 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) | Standover (mm)not published |
|---|---|---|---|---|---|---|---|---|
| XS | 538 | 360 | 70 | 74.5 | 120 | 425 | 1007 | |
| S | 554 | 368 | 70.5 | 74 | 135 | 425 | 1016 | |
| M | 574 | 375 | 70.75 | 73.75 | 155 | 425 | 1027 | |
| L | 588 | 382 | 71.75 | 73.5 | 165 | 425 | 1029 | |
| XL | 602 | 390 | 72 | 73 | 180 | 425 | 1039 | |
| XXL | 636 | 398 | 72.25 | 73 | 200 | 425 | 1051 |
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 off the maker's page: xmcarbonspeed.com- Tyre clearance
- 50 mm
- Bottom bracket
- T47 86.5
- Axles and brakes
- 12x100 / 12x142
- UDH
- yes
- Seatpost
- not published
- Frame weight
- not published
In the maker's words
Kept whole, as I read it off xmcarbonspeed.com.Sold as a frameset (frame, fork, seat post); no bar, stem or per-size stem length printed.
Cockpit and seatpost, in the maker's words · 16 words
Sold as a frameset (frame, fork, seat post); no bar, stem or per-size stem length printed.
SOURCE: xmcarbonspeed.com is the company site of Xiamen Carbon Speed Sport Goods Co., Ltd (XMCS), the maker behind the xmcarbonspeed.cc store the other XMCS files cite. Source: image_table (maker's own site xmcarbonspeed.com, Xiamen Carbon Speed Sport Goods Co., Ltd; geometry published only as the image
How I read the maker's table
the page "CS-GR01 Gravel bike frameset" (category Gravel/CX Frame, posted "Time:2024-04-30"; no model year printed, model_year null) is still live and is not on the .cc store. Its geometry is one image (uploaded 2024-05-09). Columns as printed, XS/S/M/L/XL/XXL: A "BB center to top of seattube"; B "Effective top tube horizonta(l)" (top_tube_effective); C "BB offset" -72 every size (recorded as bb_drop 72, the drop printed with a minus sign); D chainstay length 425; E seat angle; F head angle; G front center; H head tube length; I fork offset 55; J reach; K stack; WB; FL fork length 395 (not in the schema). No trail or standover printed. PROBABLE SLIP, kept as printed: the XXL stack 636 equals the XXL front centre 636 in the same row and does not close its own top tube (398 + 636 / tan 73 = 592.4 against the printed 588; a stack of 622 would close, and the step from the XL would then be 20 mm, matching the 20 mm head tube step); every other size closes within 0.5 mm. Spec text: carbon fibre T800, sizes XS/S/M/L/XL/XXL, "Weight: Frame, 1234+/-30g Fork, 450+/-15g Seat post, 184+/-10g" (no size named), finish UD matte or glossy or custom paint, "BB: T47-86.5-24mm", UDH hanger, front 100*12 and rear 142*12, max tire 700*50C. Bike Insights files the CS-GR01 with eleven size rows (XS, S, S2, M, M2 and so on).
Source: image_table (maker's own site xmcarbonspeed.com, Xiamen Carbon Speed Sport Goods Co., Ltd; geometry published only as the image https://www.xmcarbonspeed.com/U_F/U_img/image/20240509/20240509102441464146.png, 850x639 px, a drawing over a lettered table; read by eye, image NOT stored)
