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 Most makers do not publish it, so I assume 15 mm and add 6 mm to the band, which on its own is enough to hold an answer at "probably" rather than "fits".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
QuickPro TT:One
Time trial · 5 sizes
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
- QuickPro TT:One · Time trial · 5 sizes · integrated cockpit
- Geometry
- quickprousa.com, fetched 28 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) |
|---|---|---|---|---|---|---|---|---|
| XXS / 455 | 481 | 375 | 71 | 75 | 80 | 410 | 968 | 717 |
| XS / 498 | 486 | 378 | 71 | 75 | 85 | 410 | 973 | 722 |
| S / 555 | 495 | 390 | 72 | 75 | 90 | 410 | 980 | 731 |
| M / 560 | 497 | 405 | 72 | 75 | 95 | 410 | 996 | 733 |
| L / 565 | 503 | 420 | 72 | 75 | 100 | 410 | 1013 | 739 |
The table runs on to the right: 6 more columns after Reach. Scroll it sideways to read them.
The S / 555 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.
In the maker's words
Kept whole, as I read it off quickprousa.com.INTEGRATED TT cockpit: the frameset ships as Frame / Fork / TT Handlebar / Seatpost / Accessories (US product description) and the spec box lists Handlebar: "TT:ONE".
Cockpit and seatpost, in the maker's words · 301 words
INTEGRATED TT cockpit: the frameset ships as Frame / Fork / TT Handlebar / Seatpost / Accessories (US product description) and the spec box lists Handlebar: "TT:ONE". The TT:ONE Handlebar is a one-piece aero base bar with integrated stem, clip-on style extensions and armrest pads (Key Features image caption: "Aero performance design with complete adjustability, for the most efficient rider position"; AU page: "Fully adjustable extended aero cockpit. Comfortable rider positioning for all."). NOT published anywhere on the brand sites: base bar width, extension length or shape, armrest width or stack options, stem length, stem angle, spacer stack or max spacer height - the US frame page has no size or cockpit selector at all (colour only; "We confirm your order and size" after checkout) and the AU page offers only Size XXS/XS/S/M/L. No standalone TT:ONE handlebar product is sold on quickprousa.com (the separate "TR:ONE COCKPIT" USD 599 / 799 with base bar is the TR:ONE triathlon bike's part and is not stated to fit the TT:ONE). Head tube / headset: "HT 52x52mm" (upper and lower bearing 52 mm); "Headset Bearing (Pair)" USD 39 has a TTONE variant. Seatpost: included with the frameset, but type, length and offset are NOT published; the generic "SADDLE CLAMP - ZERO SETBACK SEATPOST" (USD 19) and "Spacers Package 40mm" (USD 19) are listed without any TT:ONE compatibility statement. Complete bikes (US): TT:ONE DURA-ACE Di2 USD 8,499, TT:ONE RED USD 8,699, TT:ONE RIVAL AXS 2x12 USD 6,499 (listed 2026-08-10); complete-bike spec adds Wheels "RORE TT/TR 88 TT/TR Disc Aero Pro" (88 mm front, disc rear), Inner Tube 700x28c, Saddle "SAMASSI 3D Carbon Bow Saddle", Brakes flat mount disc; "TT complete bike will be shipped unassembled". Frameset USD 2,999 (US) / AUD 4,199 (AU). Colours: Ink Shadow (raw carbon, clear coat), Dark Dyeing Yellow, Wave & Orange.
SOURCE: table read from the brand's US regional site https://www.quickprousa.com/products/tt-one-frame ("Size & Fit" accordion, HTML table, columns XXS / 455, XS / 498, S / 555, M / 560, L / 565. Source: html_table (brand regional site, "Size & Fit" table rows A-K plus Reach/Stack, with geometry diagram image
How I read the maker's table
rows A. Size / ST Length, B. Virtual TT, C. ST Angle, D. HT Angle, E. HT Length, F. RC Length, G. Wheel Base, H. Fork Rake, I. BB Drop, J. Fork Length, K. Standover, Reach, Stack). IDENTICAL numbers on https://quickproaus.com/products/tt-one (QuickPro Australia, HTML table with fuller labels: A Frame Size / Seat Tube Length, B Effective Top Tube Length, C Seat Tube Angle, D Head Tube Angle, E HT Length, F RC Length, G Wheelbase, H Fork Offset / Rake, I Bottom Bracket Drop, J Fork Length, K Standover Height; its first column header reads "XSS / 455", a typo for XXS) and on the US complete-bike pages (tt-one-red). The Chinese parent site (quick-bikes.com.cn) was not reachable on 2026-08-28 (WAF captcha / 504 on the ER:ONE attempt earlier the same day) so the regional store tables are the official source used. DIAGRAM (US page image "Geometry TT:ONE", letters A-K): STACK is drawn as the vertical from the bottom bracket centre to the top of the head tube and REACH as the horizontal from the BB centre to the same point (standard BB-to-head-tube-top datum); B is drawn as a horizontal top tube line (virtual / effective top tube); C is the seat tube angle drawn at the BB against the horizontal along the seat tube line; K standover is the vertical from the ground to the top tube; I is BB drop; J fork length axle to crown. FIELD MAPPING: seat_tube_length = A (frame size is named by its seat tube length in mm); top_tube_effective = B ("Virtual TT"); chainstay = F ("RC Length", rear centre); fork_offset = H ("Fork Rake"); standover = K. Fork length (J) = 365 mm on all sizes is not in the schema. front_centre and trail are not published (null). stock_stem_length and stock_bar_width are null because the TT:ONE cockpit is a one-piece TT bar with no published stem length or base-bar width. MODEL YEAR: the brand pages carry no year; 2026 is the catalogue year this collection is filed under (frame listed on the US store 2025-10-30, AU store 2026-03-05, both live and unchanged on 2026-08-28). SIZING GUIDE (US image https://cdn.shopify.com/s/files/1/0677/7749/5105/files/TT_Sizing_Guide.png and AU text, rider height): XXS 4'10"-5'02" / 147-157 cm; XS 5'01"-5'06" / 155-168 cm; S 5'05"-5'10" / 165-178 cm; M 5'09"-6'02" / 175-188 cm; L 6'01"-6'06" / 185-198 cm ("general fit guide only"). FRAME: high-strength high-modulus carbon; frame 1089 g +/-5%, fork 399 g +/-5% (no size stated); T47-68 mm threaded BB; 12x100 / 12x142 thru axles; max tyre 700x32c; flat mount disc; fully internal cabling.
Source: html_table (brand regional site, "Size & Fit" table rows A-K plus Reach/Stack, with geometry diagram image https://cdn.shopify.com/s/files/1/0677/7749/5105/files/Screenshot_2025-10-30_at_12.28.37_PM.png)
