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 Most makers do not publish it, so I assume 15 mm and add 6 mm to the band, which on its own is enough to hold an answer at "probably" rather than "fits".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 LCR017-D
Road · 6 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 LCR017-D · 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) |
|---|---|---|---|---|---|---|---|---|
| 46 / 460 | 502.6 | 371 | 71 | 74.5 | 105 | 410 | 971.4 | 733.9 |
| 49 / 490 | 505.4 | 385.1 | 71 | 74.5 | 108 | 410 | 986.6 | 753.6 |
| 52 / 520 | 521.2 | 390.8 | 72 | 74 | 121 | 410 | 988.7 | 772 |
| 54 / 540 | 541.9 | 390.8 | 72.5 | 73.6 | 141 | 410 | 990.8 | 793.1 |
| 56 / 560 | 562.7 | 396.4 | 73 | 73.3 | 161 | 410 | 998.2 | 813 |
| 58 / 580 | 582.9 | 402.1 | 73.3 | 73 | 181 | 410 | 1006.9 | 831.3 |
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 (Toray T1000 + T800 + M40JB), included in the frameset ("Frame + fork + seat post + clamp + headset bearings + spacers + thru-axles + HBR17 integrated handlebar").
Cockpit and seatpost, in the maker's words · 329 words
INTEGRATED one-piece bar/stem: LightCarbon HBR17 (Toray T1000 + T800 + M40JB), included in the frameset ("Frame + fork + seat post + clamp + headset bearings + spacers + thru-axles + HBR17 integrated handlebar"). Widths 360 / 380 / 400 / 420 mm (top, centre to centre); stem lengths 80 / 90 / 100 / 110 / 120 / 130 mm. The frame page lists both ranges without tying a width or length to a frame size and states no per-size default, so stock_stem_length and stock_bar_width are null. HBR17 page (https://www.lightcarbon.com/ultra-light-and-aero-carbon-road-integrated-handlebar_p257.html): stem angle -7 deg; bar reach 75 mm; bar drop 125 mm; "15mm Flare Design": 15 mm flare each side, so drop width is 390 / 410 / 430 / 450 mm for the 360 / 380 / 400 / 420 tops (a bullet elsewhere on the same page says "12 degree flare drop bar"); "8mm lift" at the tops (maker says it "saves you a 10mm spacer" versus a flat bar); steerer 28.6 mm (1 1/8 in); "Stem height spacer 2*5mm + 2*10mm" supplied (maximum spacer stack NOT published; stem clamp height NOT published); clamp torque 6 N.m; weight 295 g +/-4% (360x80), 305 (380x80), 310 (380x100), 315 (400x100), 320 (420x100); package adds computer holder (Garmin / Wahoo / Bryton / Cateye), stem cover, GoPro holder, titanium stem bolts. Headset: straight 1 1/2 in head tube, upper 52 mm / lower 52 mm bearings, included. Seatpost: LightCarbon carbon post, default 20 mm offset with 7x7 mm rail clamp; 0 mm offset with 7x9 mm clamp optional at order time; 160 g +/-10 g; post length not published; seatpost insert length per size 130 / 150 / 170 / 190 / 210 / 230 mm (46-58). A sibling listing (p241, "...Frameset With Stem") sells the same LCR017-D frame with a separate stem instead of the HBR17. HBR17 fit requirement stated by the maker: head tube upper inner diameter 52.1 mm, depth 8.7 mm, fork steerer OD 28.6 mm.
Numbers transcribed from the HTML table on the maker's own page (fetched 2026-08-29, HTTP 200, no login or JS needed). Source: html_table (manufacturer site, HTML table headed "LightCarbon Super Light Road Frame LCR017-D Geometry And Size Chart"; a geometry diagram image sits beside it and was not stored)
How I read the maker's table
the geometry diagram image next to it (/js/htmledit/kindeditor/attached/20240227/20240227162028_64274.jpg, path dated 2024-02-27) was not stored or used. STACK/REACH DATUM: the table says only "STACK" and "REACH" with no datum wording; ASSUMED to be bottom bracket centre to top of head tube (the HBR17 is a separate part and not part of stack). SIZE NAMES: the spec table names sizes 46, 49, 52, 54, 56, 58 (cm) and the geometry columns are headed 460 / 490 / 520 / 540 / 560 / 580, but the published seat tube lengths are 460 / 480 / 500 / 522 / 542 / 560, so the column header is a nominal size, not the seat tube; size_label carries both. Column mapping: top_tube_effective = "TOP TUBE LENGTH, HORIZONTAL"; standover = "BIKE STANDOVER HEIGHT(700C*32C)"; fork_offset = "FORK RAKE/OFFSET"; front_centre = "FRONT CENTER"; trail = "TRAIL" (published by the maker, not derived). Published but outside the schema: BB height 278 mm all sizes; fork length (full) 368 mm all sizes; seatpost insert length 130 / 150 / 170 / 190 / 210 / 230 mm; rider height reference 156-165 / 166-172 / 173-179 / 180-186 / 187-193 / 194-199 cm ("for reference only"). MODEL YEAR: not stated anywhere on the page (site copyright 2026; geometry image path dated 2024-02-27), so null. Frame: Toray T700 + T800 + T1000, claimed weight +/-30 g of 850 (46) / 850 (49) / 870 (52) / 890 (54) / 910 (56) / 945 (58) g, UCI approved, T47 threaded BB (68 mm, P1.0), flat mount 140 / 160, 12x100 / 12x142 thru axles, UDH, max tyre 700x32C, fork 390 g +/-15 g, ISO 4210, 2 year warranty. Category recorded as climbing road as requested (sub-900 g frame, 32 mm clearance).