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 Most makers do not publish it, so I assume 10 mm and add 6 mm to the band beside every answer.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
LightCarbon LCR020-D
Aero road · 7 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
- LightCarbon LCR020-D · Aero road · 7 sizes
- Geometry
- lightcarbon.com, fetched 22 Oct 2026, re-checked, no differences
- Seat angle convention
- Calculated from LightCarbon'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) | Standover (mm) |
|---|---|---|---|---|---|---|---|---|
| 470 | 501 | 370 | 70.5 | 74.5 | 103 | 410 | 974.3 | 732 |
| 490 | 507 | 375 | 71 | 74.5 | 108 | 410 | 977.2 | 755.5 |
| 520 | 523 | 380 | 72 | 74 | 121 | 410 | 978.5 | 773.6 |
| 540 | 544 | 385 | 72.5 | 73.6 | 141 | 410 | 985.8 | 798.5 |
| 560 | 565 | 395 | 73 | 73.3 | 161 | 410 | 997.3 | 814.6 |
| 580 | 584.8 | 400 | 73.3 | 73 | 181 | 410 | 1005.4 | 830.5 |
| 610 | 602 | 409 | 73.3 | 72.5 | 199 | 410 | 1019.6 | 843.7 |
The table runs on to the right: 6 more columns after Reach. Scroll it sideways to read them.
The 540 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: lightcarbon.com- Tyre clearance
- 35 mm
- Bottom bracket
- T47 85.5
- Axles and brakes
- 12x100 / 12x142, flat mount
- UDH
- yes
- Seatpost
- proprietary, special clamp
- Frame weight
- 1000 g, size 54cm
In the maker's words
Kept whole, as I read it off lightcarbon.com.The catalogue lists "Stem: 80/90/100/110/120/130mm" and "Handlebar: 360/380/400/420mm" for this frame, with an "integrated 52mm/52mm" head tube: LightCarbon's own bar and stem, not named, no stem angle printed.
Cockpit and seatpost, in the maker's words · 34 words
The catalogue lists "Stem: 80/90/100/110/120/130mm" and "Handlebar: 360/380/400/420mm" for this frame, with an "integrated 52mm/52mm" head tube: LightCarbon's own bar and stem, not named, no stem angle printed. No per-size stock bar or stem.
SOURCE: LightCarbon's own "2026-2027 LightCarbon Frame+Component Catalog - V4" (15 pages), a PDF on lightcarbon.com. Source: pdf_table (maker's own 2026-2027 catalogue PDF, page 1, table "LCR020-D"; read from the PDF text layer, checked against a 300 dpi render)
How I read the maker's table
each frame has a half page with a spec list, a dimensioned drawing and a table. No product page for this frame is in lightcarbon.com's sitemap (fetched 22 Oct 2026), so the catalogue is the maker's own publication of it; model_year 2026 is the first year of the catalogue's "2026-2027". Columns as printed (the drawing's red labels say what each measures): SIZE; C-T seat tube length; TT "top tube length, horizontal" (top_tube_effective); REACH and STACK (drawn to the head tube top); WB; RC chainstay; FC front centre; BB DROP; BB HEIGHT (not in the schema); ST seat tube angle; HT head tube angle; STIL (a seat-mast insertion figure at the seat clamp, not in the schema); A head tube length; Standover Height; Offset (fork rake); FL "fork length, full" (not in the schema); TRAIL (maker-published, kept). LCR020-D, "Super Aero Race", "700C Super Aero Racing Road Disc Brake Carbon Frameset": Toray T800+T1100+M40J; sizes "47/49/52/54/56/58/61cm" (the table labels them 470 to 610, kept); weight (+/-4%) 1000g/54cm UD matte; head tube "integrated 52mm/52mm"; seat post "special shape (special clamp)"; stem 80/90/100/110/120/130mm and handlebar 360/380/400/420mm (LightCarbon's own cockpit; no model named); BB T47*P1.0 (85.5mm); dropout TA 12*142mm; fork TA 12*100mm; flat mount 140/160mm; max tire 700C*35C; "Light UDH". BB HEIGHT 280 every size; STIL 130/150/170/190/200/210/220; FL 370; standover printed for a 700x35C tyre (tyre_width_mm 35). Bike Insights files this frame twice (LCR020-D 2026 and 2026 V4).