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 Most makers do not publish it, so I assume 15 mm and add 6 mm to the band, which on its own is enough to hold an answer at "probably" rather than "fits".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 GR:One
Gravel · 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 GR:One · Gravel · 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) |
|---|---|---|---|---|---|---|---|---|
| XS / 426 | 524 | 370 | 70.5 | 74.2 | 95 | 425 | 1006 | 723 |
| S / 456 | 543 | 379 | 71 | 74 | 113 | 425 | 1016 | 742 |
| M / 486 | 561 | 388 | 71 | 73.6 | 132 | 425 | 1032 | 760 |
| L / 516 | 580 | 398 | 71 | 73.3 | 152 | 425 | 1048 | 779 |
| XL / 546 | 599 | 405 | 71 | 73.8 | 172 | 425 | 1062 | 798 |
The table runs on to the right: 6 more columns after Reach. Scroll it sideways to read them.
The M / 486 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 / 426 100 x 400, S / 456 100 x 400, M / 486 100 x 400, L / 516 100 x 400, XL / 546 100 x 400 (stem length x bar width, mm)
In the maker's words
Kept whole, as I read it off quickprousa.com.INTEGRATED one-piece bar/stem: CANWIN AELOUS SSL (CANWIN is the brand's accessory label; the US frame page lists "Handlebar: CANWIN AELOUS (Outward Expansion)" i.e.
Cockpit and seatpost, in the maker's words · 342 words
INTEGRATED one-piece bar/stem: CANWIN AELOUS SSL (CANWIN is the brand's accessory label; the US frame page lists "Handlebar: CANWIN AELOUS (Outward Expansion)" i.e. flared drops; the AU page calls it "Lightweight integrated handlebar"). NOTE the US GR:ONE FRAME (USD 2,099) ships Frame / Fork / Headset / Axles / Carbon Seatpost only - the bar is chosen separately ("Add a handlebar to complete your frameset" on the Quick Ship listing); AU complete bikes include it. Bar widths (top/hoods -> drop/bottom width): 380 mm (bottom 440 mm), 400 mm (bottom 460 mm), 420 mm (bottom 480 mm); the GR:ONE build configurator on quickprousa.com also lists 440 mm (bottom 500 mm). Default width 400 mm ("Handle Bar Length (default 400mm)"), size independent. Stem lengths: 70 / 80 / 90 / 100 mm, default 100 mm ("Stem Length (default 100mm)"), size independent; the standalone AELOUS SSL Handlebar listing (quickprousa.com/products/aelous-handlebar-1, USD 380, Raw Carbon Black) offers 380/400/420 x 70/80/90/100 only. Bar reach, bar drop, flare angle, stem angle, stem/clamp height and bar weight are NOT published on the brand sites (product photos show a stem printed "WIDTH 400mm LENGTH 80mm" only). Headset: 52 x 52 mm ("HT 52x52 mm" on the US page; fully internal routing). Spacers: "Spacers Package 40mm" (USD 19) sold separately - individual spacer heights and max spacer stack NOT published; headset cover / top cap height NOT published. Seatpost: carbon seatpost included with the frame, 169 g +/-5%; lengths 35 cm (default) or 40 cm; offset -20 mm setback (default in the GR:ONE configurator, sold separately as "SEATPOST -GR:ONE -20mm SETBACK", USD 179, 35/40 cm) or zero setback ("Zero Setback (ARONE Seatpost)", the AR:ONE/GR:ONE zero-offset post, USD 179, 35/40 cm). Crank length options in the build configurator: 165 / 170 mm (default 170), plus 172.5 mm on the AU builds. Fork: one fork only (400 mm axle-to-crown, 459 g +/-5%); no wide/narrow option on the GR:ONE (that is an ER:ONE option). Complete builds offered (US): GRX Di2 1x12, GRX Di2 2x12, GRX mechanical 2x12, SRAM RIVAL / FORCE / RED XPLR 1x13.
SOURCE: the brand's own US regional store, "Size & Fit" HTML table on https://www.quickprousa.com/products/gr-one-frame (QUICK PRO USA, product record created 2025-10-24, updated 2026-08-28). Source: html_table
How I read the maker's table
IDENTICAL table (rows lettered A-K plus Reach/Stack) on the brand's AU store https://quickproaus.com/products/gr-one-grx-di2-1x12 with geometry diagram https://quickproaus.com/cdn/shop/files/gr-one-geometry.png. The Chinese parent site (quick-bikes.com.cn) was not attempted this time - it returned WAF captcha / 504 on every attempt during the ER:ONE collection. COLUMN MAPPING (brand label -> field): "Size / ST Length (mm)" -> seat_tube_length and size label; "Virtual TT (mm)" -> top_tube_effective (horizontal top tube, letter B in the diagram); "ST Angle" -> seat_tube_angle; "HT Angle" -> head_tube_angle; "HT Length" -> head_tube_length; "RC Length (mm)" (rear centre, letter F, drawn BB centre to rear axle) -> chainstay; "Wheel Base" -> wheelbase; "Fork Rake" -> fork_offset; "BB Drop" -> bb_drop; "Standover" -> standover (letter K, drawn vertically from the ground to the top tube). "Fork Length (mm)" 400 all sizes (axle to crown, letter J) is published but has no schema field. STACK DATUM: the AU diagram draws Stack vertically and Reach horizontally from the bottom bracket centre to the top of the head tube (standard convention); the brand states no datum in words. SEAT ANGLE CONVENTION: labelled only "ST Angle (deg)" - the brand does not say effective or actual; the diagram draws angle C at the seat tube centreline where it meets the BB, which reads as the actual tube angle, but the frame has a near-straight seat tube so effective and actual should be close. Values are as published even where odd: XL is steeper (73.8) than L (73.3). Front centre and trail are NOT published (left null). stock_stem_length 100 and stock_bar_width 400 are the size-independent configurator defaults ("default 100mm" / "default 400mm"), not a per-size spec - the AELOUS stem range is 70-100 mm. Stack-to-reach: 1.42 / 1.43 / 1.45 / 1.46 / 1.48. SIZE NAMES: the store uses XS/S/M/L/XL with the seat tube length as the numeric size (426/456/486/516/546); the sizing guide uses XS/SM/MD/LG/XL. SIZING GUIDE (brand image https://cdn.shopify.com/s/files/1/0677/7749/5105/files/GR_Sizing_Guide.png and AU text): XS 5ft0-5ft4 / 152-163 cm; SM 5ft3-5ft8 / 160-173 cm; MD 5ft7-6ft0 / 170-183 cm; LG 5ft11-6ft3 / 180-190 cm; XL 6ft2-6ft6 / 188-198 cm ("Sizing may vary based on rider proportions, build, flexibility, and riding style"). FRAME FACTS (US page): high-strength high-modulus carbon monocoque ("Monolith One Piece Construction"), frame 919 g +/-5% (size M), fork 459 g +/-5%, seatpost 169 g +/-5% (AU page says "Frameset weight of 879g"), head tube 52x52 mm, BB T47-68 mm threaded, thru-axles F 100x12 / R 142x12 mm, max tire 700x45c. Category: the store files it under "GRAVEL - RACE" ("All Terrain Racing Gravel"). MODEL YEAR: the chart is undated on the brand sites; US product record created 2025-10-24, AU GR:ONE records created 2026-03-03; sizing guide image versioned Feb 2026, AU geometry diagram versioned Aug 2026; no year is claimed, so model_year is null.
