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 Most makers do not publish it, so I assume 15 mm and add 6 mm to the band, which on its own is enough to hold an answer at "probably" rather than "fits".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
Trifox X11
All-road · 4 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
- Trifox X11 · All-road · 4 sizes · integrated cockpit
- Geometry
- trifoxbike.com, fetched 29 Aug 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
- 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)not published |
|---|---|---|---|---|---|---|---|---|
| XS (510mm) | 510 | 368 | 72 | 74 | 116.9 | 415 | 979 | |
| S (530mm) | 534 | 377 | 72 | 74 | 142.1 | 415 | 996 | |
| M (550mm) | 558 | 386 | 73 | 73 | 161 | 415 | 1000 | |
| L (580mm) | 580 | 398 | 73 | 73 | 184.7 | 415 | 1017 |
The table runs on to the right: 6 more columns after Reach. Scroll it sideways to read them.
The M (550mm) 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.
Stock stem and bar per sizeXS (510mm) 90 x 400, S (530mm) 90 x 400, M (550mm) 90 x 400, L (580mm) 90 x 400 (stem length x bar width, mm)
In the maker's words
Kept whole, as I read it off trifoxbike.com.INTEGRATED one-piece bar/stem: "Carbon Integrated Drop Handlebar DHX11" is included in the frameset (Package Content: 1 x Carbon Road Bike Frame X11, 1 x Carbon Fork FX11, 1 x Carbon Seatpost SX11, 1 x T47 Bottom Bracket, 1 x Carbon Integrated Drop Handlebar DHX11, 1 x Headset, 1 x Rear UDH Derailleur Hanger HX11).
Cockpit and seatpost, in the maker's words · 246 words
INTEGRATED one-piece bar/stem: "Carbon Integrated Drop Handlebar DHX11" is included in the frameset (Package Content: 1 x Carbon Road Bike Frame X11, 1 x Carbon Fork FX11, 1 x Carbon Seatpost SX11, 1 x T47 Bottom Bracket, 1 x Carbon Integrated Drop Handlebar DHX11, 1 x Headset, 1 x Rear UDH Derailleur Hanger HX11). The only DHX11 size the maker states is in the weight table: "Integrated Drop Bar - 90*400mm" 312 g, read as 90 mm stem x 400 mm bar. The product page has just two selectors (Painting: Starry Blue / Bare Carbon; Size: XS/S/M/L), so there is NO bar or stem size choice at order time and no per-size bar spec; stem angle, bar reach, bar drop, clamp/stack height, spacer heights and max spacer stack are NOT published. The DHX11 is not sold separately (absent from the site's Drop Bars category on 2026-08-29); Trifox's separate DHB1000 fully-internal integrated bar (360/380/400 mm cockpits) does not say it fits the X11, so nothing is assumed from it. One owner review on the page notes "the integrated handlebar limits stem length adjustments". Headset: "Headset Size: Ø52 x 7mm" (maker's wording; headset included). Seatpost: "Carbon Seatpost SX11" included, 238 g, "Seatpost insertion length 7cm to 12cm"; the photos show a proprietary aero-profile post with a rearward-kicked head, but offset/setback, length and clamp diameter are NOT published. Fork: "Carbon Fork FX11", 398 g, full length 375.6 mm, rake 50 mm, 12x100 thru axle, flat mount, rotors 140-160 mm.
Table is the HTML "Product Geometry" table on the maker's page, rows A-N keyed to the diagram https://img.trifoxbike.com/media/upload/2/ww/2wwzt8o8d2n70yi1768637647.jpg (read, not stored). Source: html_table (maker's own store page, "Product Geometry" HTML table keyed A-N to a geometry diagram image)
How I read the maker's table
STACK DATUM: G (Stack) is drawn as the vertical from the bottom bracket centre to the level of the top of the head tube, and I (Reach) as the horizontal from the BB vertical to the top-centre of the head tube - the usual frame stack/reach datum, no headset cap or spacers included. SIZE NAMES: XS(510mm) / S(530mm) / M(550mm) / L(580mm) - the mm in the label is a nominal size, it matches neither the seat tube length F (400/431/463/481) nor the horizontal top tube H (513/530/557/574). Column mapping: head_tube_angle = A; seat_tube_angle = B; chainstay = C (Chainstay Length); bb_drop = D; wheelbase = E; seat_tube_length = F (Seat Tube Lenght [sic], BB centre to top of seat tube per diagram); stack = G; top_tube_effective = H (Top Tube Lenght Horizontal); reach = I; head_tube_length = J (published to 0.1 mm: 116.9/142.1/161/184.7); fork_offset = L (Fork Rake/Offset); front_centre = M (Front Center, drawn BB centre to front axle). Standover and trail are NOT published (null). Sanity check: front centre (as a BB-to-axle length) projected horizontally plus chainstay projected horizontally reproduces the published wheelbase within 1 mm on every size. stock_stem_length 90 and stock_bar_width 400 are the single DHX11 size the maker prints (weight table "Integrated Drop Bar - 90*400mm"), size-independent and not selectable - the page does not say in words that every size ships that bar, so treat it as the maker's only stated bar size rather than a per-size spec. SPEC (Parameter table): Type "Road Bike Frame"; Style "Full Internal Cable Routing Bike Frameset"; Material T800 Carbon Fiber; Color Starry Blue / Bare Carbon; Headset Size Ø52 x 7mm; Bottom Bracket T47 (a T47 BB is in the box); Max Tire 700 * 32C; Thru Axles Rear 142mm x Ø12, Front 100mm x Ø12; Disc Rotor 140mm-160mm; Warranty 2 Years; UDH hanger HX11; frame-only weights +/-20 g: XS 965 g, S 985 g, M 1005 g, L 1035 g; fork 398 g, seatpost 238 g, bar 312 g, hanger 30 g, rear axle 42 g, front axle 34 g. Price USD 729.99 (sale, list 989.99) on 2026-08-29, SKU X11BCXS510. MODEL YEAR: the maker states none; the page's images were uploaded 2026-01-17 (upload timestamps in the file names), the product image 2026-01-19, and the earliest customer review is dated 2026-01-28, so the X11 went on sale in January 2026 - model_year left null because it is unstated, but 2026 is the safe reading. The maker's 2026-08-18 news article on the X9 describes the X11 as the existing lightweight road frame the X9 improves on.