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 Most makers do not publish it, so I assume 10 mm and add 6 mm to the band beside every answer.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 LCG071-PRO and LCG074-D
Gravel · 4 sizes
The LCG071-PRO and LCG074-D on lightcarbon.com
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
- LightCarbon LCG071-PRO and LCG074-D · Gravel · 4 sizes · integrated cockpit
- Geometry
- lightcarbon.com, fetched 20 Oct 2026, read off the maker's chart, 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) |
|---|---|---|---|---|---|---|---|---|
| 49 / 490 | 542.6 | 374.1 | 71 | 73.5 | 120 | 430 | 1008.9 | 776.4 |
| 52 / 520 | 563.4 | 377.5 | 71.5 | 73 | 140 | 430 | 1014.5 | 793.4 |
| 55 / 550 | 598.6 | 386 | 72 | 72.5 | 175 | 430 | 1029.6 | 833.4 |
| 58 / 580 | 627.1 | 397.1 | 72 | 72.5 | 205 | 430 | 1049.8 | 863.9 |
The table runs on to the right: 6 more columns after Reach. Scroll it sideways to read them.
The 55 / 550 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.LightCarbon HBR08Vendor-listedstem -7 · reach 82 · drop 125 · clamp 37 · lengths 90-120 · widths 380-440
Frame facts
read from the maker's words, not a table: lightcarbon.com- Tyre clearance
- not recorded yet
- Bottom bracket
- T47
- Axles and brakes
- 12x100 / 12x142, flat mount
- UDH
- yes
- Seatpost
- not recorded yet
- Frame weight
- not recorded yet
In the maker's words
Kept whole, as I read it off lightcarbon.com.The page's own specification table, verbatim: Frame: LightCarbon Gravel Frameset with Downtube Storage And Integrated Handlebar; Material: High modulus Toray T700+T800 carbon fiber; Size: 49, 52, 55, 58 (cm); Fork: LightCarbon specific gravel carbon fork, 495g+-15g; Handlebar HBR08 size: 380/400/420/440mm; Stem length: 90/100/110/120mm; Headtube: Straight 1 1/2'' head tube (upper 52mm lower 52mm); Weight(+-40g): 1110g/49cm 1140g/52cm 1170g/55cm 1200g/58cm *Weight includes downtube lid; Seatpost: Option 1: SP02 (25mm offset, 193+/-10g).
Cockpit and seatpost, in the maker's words · 173 words
The page's own specification table, verbatim: Frame: LightCarbon Gravel Frameset with Downtube Storage And Integrated Handlebar; Material: High modulus Toray T700+T800 carbon fiber; Size: 49, 52, 55, 58 (cm); Fork: LightCarbon specific gravel carbon fork, 495g+-15g; Handlebar HBR08 size: 380/400/420/440mm; Stem length: 90/100/110/120mm; Headtube: Straight 1 1/2'' head tube (upper 52mm lower 52mm); Weight(+-40g): 1110g/49cm 1140g/52cm 1170g/55cm 1200g/58cm *Weight includes downtube lid; Seatpost: Option 1: SP02 (25mm offset, 193+/-10g). Option 2: SP03 (15mm offset, 192+/-10g); Bottom bracket: Threaded T47 *P1.0 (85.5mm width); Max tire clearance: 700*50C or 650B*2.1'' or 29er*1.95''; Max Chainring: 1) If use Shimano crankset, max 2x chainring 54-40T, max 1x chainring 42T (smaller ones are all fine). 2) If use Sram crankset, max 2x chainring 54-41T, max 1x chainring 42T (smaller ones are all fine).; Brake mount type: Flat mount disc brake (disc brake bolts length 38.2mm); Dropout: Front 12*100mm, Rear 12*142mm Thru-axle. UDH hanger; Groupset: Both Mechanical and Di2 groupset compatible (Not compatible with old rear derailleur without B-LINK, eg old 105 5800); Test Standard: ISO4210; Warranty: 2 years.
SOURCE: www.lightcarbon.com is LightCarbon's own site (Xiamen LightCarbon Technology Co., Ltd). Source: html table (maker's own product page, a real HTML geometry table with named rows; parsed from the raw HTML, no image used)
How I read the maker's table
the product page "LightCarbon New Gravel Frameset With Integrated Handlebar" (item no. LCG071-PRO) publishes the geometry as a real HTML table with named rows, parsed from the raw HTML. The same table appears on: p171 (item no. LCG071S-PRO, https://www.lightcarbon.com/new-carbon-gravel-frameset-with-integrated-stem-system_p171.html, 203827 bytes): identical geometry rows; p254 (item no. LCG074-D, https://www.lightcarbon.com/lightcarbon-gravel-frameset-micro-suspension-pivot-design-with-integrated-handlebar_p254.html, 208388 bytes): identical geometry rows; p255 (item no. LCG074S-D, https://www.lightcarbon.com/lightcarbon-gravel-frameset-micro-suspension-pivot-design-with-stem_p255.html, 205988 bytes): identical geometry rows. ROW MAPPING: REACH, STACK, WHEELBASE, CHAINSTAY LENGTH, FRONT CENTER, BB DROP, SEAT TUBE ANGLE, HEAD TUBE ANGLE, SEAT TUBE LENGTH, HEAD TUBE LENGTH, FORK RAKE/OFFSET and TRAIL map one to one; "TOP TUBE LENGTH, HORIZONTAL" is top_tube_effective; "BIKE STANDOVER HEIGHT(700C*53C)" is standover (the tyre the maker measured it with is in the row name). Rows not in the schema, kept here: Seatpost Insert Length 180mm / 220mm / 250mm / 270mm; Bb Height 285mm / 285mm / 285mm / 285mm; Bike Standover Height(650B*2.1") 766.4mm / 783.4mm / 823.4mm / 853.9mm; Fork Length, Full 397mm / 397mm / 397mm / 397mm. Body-height bands are printed per size "for reference only". STACK DATUM: not stated; recorded as the usual head tube top. SIZE LABELS: the geometry table heads its columns 490 / 520 / 550 / 580 and the spec table lists "49, 52, 55, 58 (cm)"; size_label carries both as "cm / mm". The maker prints the SAME geometry table, cell for cell, on four pages: LCG071-PRO (gravel frameset with integrated handlebar, down tube storage), LCG071S-PRO (its integrated-stem version), LCG074-D ("micro suspension pivot design", integrated handlebar) and LCG074S-D (its stem version); they are recorded as one file because there is one table, and both model names are kept. HBR08 integrated gravel handlebar 380/400/420/440 mm with stems 90-120 mm; straight 1 1/2 in head tube (52/52 mm bearings). standover is the 700C x 53C row; the maker also prints a 650B x 2.1 in standover row (766.4 / 783.4 / 823.4 / 853.9 mm), not a schema field. MODEL YEAR: not printed; model_year null. No Panda Podium, Geometry Geeks or 99 Spokes request was made.