LightCarbon LCTT25
Time trial · 4 sizes
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- Bike
- LightCarbon LCTT25 · Time trial · 4 sizes · integrated cockpit
- Geometry
- lightcarbon.com, fetched 20 Oct 2026, re-checked, no differences
- Cockpit
- Generic stem and bar, assumed
- 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
- 22 October 2026 · 686 bikes, 74 makes, 3,984 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.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
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 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
- proprietary
- Frame weight
- 1600 g
In the maker's words
Kept whole, as I read it off lightcarbon.com.The page's own specification table, verbatim: Frame: LightCarbon 700C Ultra Aero Triathlon Disc Brake Carbon Frame Set; Material: High modulus T700 + T800 grade carbon fiber; Size: 49/52/54/56cm; Fork: LightCarbon specific aero carbon fork; Headtube: Integrated headtube 42/42mm (FSA NO.8B standard headset); Weight (±4%): frame 1600g/54cm; fork 700g; Seatpost: LightCarbon specific aero seat post; Bottom bracket: Threaded T47 * P1.0 (86.5mm width); Max tire clearance: 700*28C (Width As Measured); Handlebar width: 400mm / 420mm; Stem length: 100mm; Brake type: Disc Brake: Flat Mount, rear 140mm / front 160mm rotor; Dropout: Front 12*100mm TA, Rear 12*142mm TA, UDH hanger; Groupset: Mechanical and Di2 compatible; Test Standard: ISO4210; Warranty: 2 years.
Cockpit and seatpost, in the maker's words · 109 words
The page's own specification table, verbatim: Frame: LightCarbon 700C Ultra Aero Triathlon Disc Brake Carbon Frame Set; Material: High modulus T700 + T800 grade carbon fiber; Size: 49/52/54/56cm; Fork: LightCarbon specific aero carbon fork; Headtube: Integrated headtube 42/42mm (FSA NO.8B standard headset); Weight (±4%): frame 1600g/54cm; fork 700g; Seatpost: LightCarbon specific aero seat post; Bottom bracket: Threaded T47 * P1.0 (86.5mm width); Max tire clearance: 700*28C (Width As Measured); Handlebar width: 400mm / 420mm; Stem length: 100mm; Brake type: Disc Brake: Flat Mount, rear 140mm / front 160mm rotor; Dropout: Front 12*100mm TA, Rear 12*142mm TA, UDH hanger; Groupset: Mechanical and Di2 compatible; 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 Ultra Aero Triathlon Carbon Frame Disc Brake 700C Carbon Fiber TT Bike Frameset" (item no. LCTT25) publishes the geometry as a real HTML table with named rows, parsed from the raw HTML. 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*28C)" is standover (the tyre the maker measured it with is in the row name). Rows not in the schema, kept here: Seatpost Insert Length 200mm / 230mm / 245mm / 260mm; Bb Height 270mm / 270mm / 270mm / 270mm; Fork Length, Full 372mm / 372mm / 372mm / 372mm. 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 / 540 / 560 and the spec table lists "49/52/54/56cm"; size_label carries both as "cm / mm". Triathlon frameset with an integrated 42/42 mm head tube and LightCarbon aero bar (handlebar width 400 or 420 mm, stem 100 mm, per the spec table); the base bar and extension geometry are not published, so no cockpit geometry is recorded. A geometry drawing (alt "LightCarbon Disc Brake Triathlon Carbon Frameset LCTT25 Geometry") sits above the HTML table; the HTML table was used. The maker prints trail 73.8 / 58 / 64.8 / 64.8 mm with head angles 70.5 / 71 / 72.5 / 72.5 deg and one 43 mm offset: 490, 540 and 560 follow the head angle (a steeper head angle gives less trail) but 520 at 71 deg prints 58, less than the 72.5 deg sizes, which looks like a maker slip (about 71 would fit); kept as printed. TOP TUBE: the printed horizontal top tube (507 / 513 / 541 / 570) is 6-17 mm shorter than reach + stack / tan(76) on every size, so the 76 deg seat angle and the top tube are not drawn to the same seat tube line (a triathlon frame often prints an effective angle to a forward saddle position); the seat angle check will flag it and nothing was changed. MODEL YEAR: not printed; model_year null. No Panda Podium, Geometry Geeks or 99 Spokes request was made.