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.
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 Most makers do not publish it, so I assume 10 mm and add 6 mm to the band beside every answer.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.
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.
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.
Close Escape closes it. The measuring guide has the pictures. Open the measuring guide
LightCarbon LCTT004
Time trial · 4 sizes
The LCTT004 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 LCTT004 · Time trial · 4 sizes · integrated cockpit
- Geometry
- lightcarbon.com, fetched 20 Oct 2026, read off the maker's chart, re-checked, no differences
- 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 |
|---|---|---|---|---|---|---|---|---|
| 48 / 480 | 497.5 | 382.6 | 72.5 | 75 | 71.5 | 395 | 945.7 | |
| 51 / 510 | 510 | 403.1 | 72.5 | 75 | 81.5 | 395 | 966.7 | |
| 54 / 540 | 535.6 | 421.1 | 72.5 | 75 | 100 | 395 | 985.5 | |
| 57 / 570 | 569.5 | 441.1 | 72.5 | 75 | 118 | 395 | 1005.8 |
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. A dashed tube is a number the maker left out (est.).
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.
Stock stem and bar per size48 / 480 100 x 420, 51 / 510 100 x 420, 54 / 540 100 x 420, 57 / 570 100 x 420 (stem length x bar width, mm)
Frame facts
read from the maker's words, not a table: lightcarbon.com- Tyre clearance
- not recorded yet
- Bottom bracket
- BB386
- Axles and brakes
- QR
- UDH
- not recorded yet
- Seatpost
- proprietary
- 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 integrated pro triathlon carbon frameset; Material: High modulus Toray T700 carbon fiber; Size: 48, 51, 54, 57; Fork: LightCarbon specify carbon fork; Headtube: Integrated headtube 42/42mm(FSA NO.8B standard headset); Weight: 1800g/54cm; Seatpost: Specify aero seat post; Bottom bracket: Press fit BB386; Max tire clearance: 700*25c; Integrated handlebar: 420mm width; Integrated stem: 100mm length; Brake type: Lightcarbbon OE brakes; Dropout: Standard 9*100mm and 9*130mm QR; Groupset: Machanical and Di2 compatible; Test Standard: ISO4210; Warranty: 2 years.
Cockpit and seatpost, in the maker's words · 121 words
The page's own specification table, verbatim: Frame: LightCarbon integrated pro triathlon carbon frameset; Material: High modulus Toray T700 carbon fiber; Size: 48, 51, 54, 57; Fork: LightCarbon specify carbon fork; Headtube: Integrated headtube 42/42mm(FSA NO.8B standard headset); Weight: 1800g/54cm; Seatpost: Specify aero seat post; Bottom bracket: Press fit BB386; Max tire clearance: 700*25c; Integrated handlebar: 420mm width; Integrated stem: 100mm length; Brake type: Lightcarbbon OE brakes; Dropout: Standard 9*100mm and 9*130mm QR; Groupset: Machanical and Di2 compatible; Test Standard: ISO4210; Warranty: 2 years. The geometry image's own block gives "HB-Size 420" and "Stem-Size 100" for every size (integrated base bar and stem); recorded as stock_bar_width and stock_stem_length. Seatpost "Special 74-78 deg" (an aero post adjustable over that effective seat angle range).
SOURCE: www.lightcarbon.com is LightCarbon's own site. Source: image_table (the maker's product page shows the geometry as one image in its description, alt text naming the model's geometry
How I read the maker's table
TABLE LEGEND (drawing above the table): A = head tube length (drawn along the head tube top); offset = fork offset; TT = top tube, drawn horizontal (top_tube_effective); HT = head tube angle and ST = seat tube angle (arcs on the drawing); BB = the BB drop drawn as G; RC = chainstay; WB = wheelbase; FC = front centre; STACK and REACH from the BB centre to the head tube top. The drawing also prints the fork length 370, wheel radius R340 and tyre 700C*25C; the table prints no seat tube length. The table's right-hand block reads RD Inner, FD Inner, POST "Special 74-78 deg", H/T INSERT "FSA NO.8B", BB INSERT "BB386 ID:46", Brake "Special", HB-Size 420, Stem-Size 100. TOP TUBE: reach + stack / tan(75) is 1-5 mm longer than the printed top tube on every size; the seat angle check will show it and nothing was changed. SIZE LABELS: the image table heads its rows 480 / 510 / 540 / 570; the page spec table lists the cm sizes; size_label carries both as "cm / mm". NOT PUBLISHED: standover, trail (null). MODEL YEAR: not printed (image uploaded 2023-09-07); model_year null. No Panda Podium, Geometry Geeks or 99 Spokes request was made.
Source: image_table (the maker's product page shows the geometry as one image in its description, alt text naming the model's geometry: https://www.lightcarbon.com/js/htmledit/kindeditor/attached/20230907/20230907174756_92777.jpg, 1060x891 px, drawing + table; the page's HTML size table carries only sizes and body-height bands; numbers read by eye, image NOT stored)
