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 Most makers do not publish it, so I assume 15 mm and add 6 mm to the band, which on its own is enough to hold an answer at "probably" rather than "fits".
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 bar is than your saddle.
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 LCR018-D
Endurance road · 6 sizes
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This is the bike I ride
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- Bike
- LightCarbon LCR018-D · Endurance road · 6 sizes · integrated cockpit
- Geometry
- lightcarbon.com, fetched 29 Aug 2026, re-checked, no differences
- Cockpit
- HBR17, the maker's spec
- Solved with
- cover 15 mm (assumed), max spacers 40 mm (assumed), stem clamp centre 20 mm (assumed), so every verdict carries ±10 mm at the bar
- Sheet
- 6 September 2026 · 210 bikes, 43 makes, 1,262 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 / 470 | 519.6 | 365 | 70.9 | 75 | 107 | 415 | 983.3 | 713.5 |
| 50 / 500 | 538.1 | 371 | 71.3 | 74.5 | 125 | 415 | 992 | 740.5 |
| 52 / 520 | 552 | 377 | 72 | 74 | 137 | 415 | 992.2 | 758.6 |
| 54 / 540 | 569 | 383 | 72 | 73.7 | 157 | 415 | 1004.8 | 779.4 |
| 56 / 560 | 586.8 | 389 | 72.6 | 73.5 | 172 | 415 | 1006.3 | 797 |
| 58 / 580 | 605.8 | 396 | 72.6 | 73.2 | 194 | 415 | 1020.3 | 812.5 |
The table runs on to the right: 6 more columns after Reach. Scroll it sideways to read them.
The 54 / 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
What each size is solved on unless you choose another bar on the sheet.LightCarbon HBR17Stockstem -7 · reach 75 · drop 125 · lengths 80-130 · widths 360-420
In the maker's words
Kept whole, as I read it off lightcarbon.com.INTEGRATED one-piece bar/stem: LightCarbon HBR17 (frameset includes "Frame + fork + seat post + clamp + headset bearings + spacers + thru-axles + HBR17 integrated handlebar"; bar and stem size are chosen at order, no per-frame-size default is published, so stock_stem_length and stock_bar_width are null).
Cockpit and seatpost, in the maker's words · 376 words
INTEGRATED one-piece bar/stem: LightCarbon HBR17 (frameset includes "Frame + fork + seat post + clamp + headset bearings + spacers + thru-axles + HBR17 integrated handlebar"; bar and stem size are chosen at order, no per-frame-size default is published, so stock_stem_length and stock_bar_width are null). HBR17 spec from https://www.lightcarbon.com/ultra-light-and-aero-carbon-road-integrated-handlebar_p257.html: widths 360 / 380 / 400 / 420 mm measured top centre-to-centre, with 15 mm flare per side so the drops measure 390 / 410 / 430 / 450 mm; stem lengths 80 / 90 / 100 / 110 / 120 / 130 mm; stem angle -7 deg; reach 75 mm; drop 125 mm; 8 mm "lift" built into the tops (maker says it replaces a 10 mm spacer); steerer 28.6 mm (1 1/8 in); supplied spacers 2 x 5 mm + 2 x 10 mm (so 30 mm max from the kit; no separate max-spacer statement); clamp torque 6 Nm; weight 295 g +/-4% (360x80) to 320 g +/-4% (420x100); full internal routing; computer mount for Garmin / Bryton / Wahoo / Cateye plus GoPro holder included. Head tube: straight 1 1/2 in, headset upper 52 mm / lower 52 mm; HBR17 needs a 52.1 mm ID x 8.7 mm deep head tube top and it sits on a C-ring over the upper bearing. Seatpost: frame-specific carbon post (hollowed head, Di2 battery sits inside on a rubber plug, dust cover from below), 0 mm offset (default supplied) or 15 mm offset optional, 180 g +/-10 g, clamp fits 7x7 mm alloy and 7x9 mm carbon rails, external seat clamp 8-10 Nm; post length and section shape NOT published. Seatpost insert length per size from the geometry chart: 160 / 160 / 160 / 170 / 200 / 200 mm (470 to 580). Fork: LightCarbon aero carbon, 430 g +/-4%, full length 378 mm all sizes, offset 51 mm (sizes 47-54) and 47 mm (56-58), 12x100 TA. Frame: Toray T800 + T1100 + M40J, 1040 / 1070 / 1100 / 1130 / 1160 / 1190 g +/-4% by size, T47 threaded BB (P1.0, 85.5 mm shell), 12x142 TA with UDH, flat mount 140 or 160 mm, max tyre 700x38C measured, downtube storage box, max chainring Shimano 54-40 (2x) / 42T (1x), SRAM 56-43 (2x) / 54T (1x).
Source is the maker's own product page (lightcarbon.com, English site), section "LightCarbon Aero Endurance Carbon Road Frame LCR018-D Geometry And Size Chart", published as a real HTML table (a JPG copy of the chart, /js/htmledit/kindeditor/attached/20260820/20260820133957_68167.jpg, sits above it. Source: html_table
How I read the maker's table
the HTML table was used and no image was stored). Numbers are copied exactly as printed including decimals. SIZE NAMES: chart columns are 470 / 500 / 520 / 540 / 560 / 580; the spec table calls the same sizes 47 / 50 / 52 / 54 / 56 / 58 cm; size_label carries both. STACK / REACH DATUM: not stated on the page; assumed the usual BB centre to head tube top centre. top_tube_effective = "TOP TUBE LENGTH, HORIZONTAL". standover = "BIKE STANDOVER HEIGHT (700C*32C)", i.e. measured with 32 mm tyres. trail and front_centre ARE published by the maker (rows "TRAIL" and "FRONT CENTER"). Size 560 wheelbase is printed "1006.3+mm" on the page; the stray plus sign is dropped and 1006.3 recorded. Extra rows not in the schema: BB HEIGHT 274 / 274 / 274 / 276 / 276 / 278 mm; FORK LENGTH, FULL 378 mm all sizes; SEATPOST INSERT LENGTH 160 / 160 / 160 / 170 / 200 / 200 mm; BODY HEIGHT (reference) 156-165 / 166-172 / 173-179 / 180-186 / 187-193 / 194-199 cm, marked "for reference only, may vary due to different body proportions". The design-highlights text gives trail 61-68 mm, BB drop 74-78 mm, HT angle 71-72.6 deg and stack/reach ratio about 1.45-1.50, consistent with the table (computed S/R 1.42 / 1.45 / 1.46 / 1.49 / 1.51 / 1.53). MODEL YEAR: none stated anywhere on the page and the maker's news list has no launch post; page images were uploaded Dec 2025 to Feb 2026 and the chart image Aug 2026, so it is a current 2026 listing but model_year is left null rather than guessed. Category: maker calls it "Aero Endurance All-Road"; recorded as endurance road (38C clearance, 415 chainstays, 74-78 drop).