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 Most makers do not publish it, so I assume 15 mm and add 6 mm to the band, which on its own is enough to hold an answer at "probably" rather than "fits".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 Er:One
Aero road · carbon · 6 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 Er:One · Aero road · carbon · 6 sizes · integrated cockpit · seatpost offsets 0 / 15 mm
- Geometry
- quickprousa.com, fetched 28 Aug 2026, not yet re-checked
- Cockpit
- Zephyr SSL integrated, -8, the maker's spec
- Solved with
- cover 15 mm (assumed), max spacers 40 mm (published), stem clamp centre 18.5 mm (assumed), so every verdict carries ±10 mm at the bar
- Price
- USD 2,099-2,299 frameset at Panda Podium, 28 Aug 2026
- 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 / 430 | 505 | 380 | 70 | 75 | 105 | 408 | 985 | 746 |
| S / 460 | 521 | 381 | 71 | 74.5 | 118 | 408 | 985 | 762 |
| M / 490 | 538 | 386 | 72 | 74 | 132 | 408 | 987 | 779 |
| L / 520 | 556 | 393 | 73 | 73.5 | 148 | 408 | 991 | 797 |
| XL / 550 | 572 | 406 | 73 | 73.5 | 165 | 408 | 1008 | 813 |
| XXL / 584 | 593 | 415 | 73.5 | 73 | 185 | 408 | 1019 | 846 |
The table runs on to the right: 6 more columns after Reach. Scroll it sideways to read them.
The L / 520 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
What each size is solved on unless you choose another bar on the sheet.QuickPro Zephyr SSL integrated, -8Stockstem -8 · reach 75 · lengths 70-140
Stock stem and bar per sizeXS / 430 100 x 400, S / 460 100 x 400, M / 490 100 x 400, L / 520 100 x 400, XL / 550 100 x 400, XXL / 584 100 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: Quick Pro ZEPHYR SSL (T1100 carbon; frameset "includes" it on quickproaus.com/products/er-one; on quickprousa.com the ER:ONE FRAME ships Frame/Fork/Headset/Axles/Carbon Seatpost and the bar is chosen in the configurator).
Cockpit and seatpost, in the maker's words · 312 words
INTEGRATED one-piece bar/stem: Quick Pro ZEPHYR SSL (T1100 carbon; frameset "includes" it on quickproaus.com/products/er-one; on quickprousa.com the ER:ONE FRAME ships Frame/Fork/Headset/Axles/Carbon Seatpost and the bar is chosen in the configurator). Bar widths (A, hood-to-hood): 340 / 360 / 380 / 400 / 420 mm; outer width (B): 366.5 / 386.5 / 406.5 / 426.5 / 446.5 mm. Stem lengths in the ER:ONE configurator (US and AU): 70 / 80 / 90 / 100 / 110 / 120 / 130 / 140 mm, any width x any length selectable; US configurator labels defaults "Handlebar Length (default 400mm)" and "Stem Length (default 100mm)" (size independent). The standalone Zephyr SSL listing on quickprousa.com/products/zephyr-handlebar-1 offers 70-130 only; Panda Podium (distributor) says availability by width: 340 = 70-110, 360/380/400 = 80-140, 420 = 90-140. Stem angle -8 deg (all sizes); stem height 37 mm; bar reach 75 mm; bar drop 125 mm; "expansion angle" (flare) 6.1 deg; steerer inner diameter 28.6 mm; weight 288 g +/-3% (380x90 incl. paint). Alternatives: ZEPHYR SL (T1000, 339 g, same widths, stems 70-130) and AELOUS SSL (380/400/420 x 70/80/90/100). Spacers: "Spacers Package 40mm" sold separately (USD 19, image shows five split two-piece spacers; individual spacer heights and max spacer stack NOT published). Headset cover / top cap height NOT published ("Zephyr Handlebar Top Cap" USD 39). Headset: Ti-Parts (distributor) lists "52mm upper / 52mm lower" - not confirmed on brand site. Seatpost: carbon aero (D-shape) seatpost; length 35 cm or 40 cm; offset Zero or -15 mm (ER:ONE specific "SEATPOST - ER:ONE -15mm SETBACK"; Ti-Parts reprint lists "Straight or 20mm offset" which matches the GR:ONE post, not the ER:ONE). Fork: Wide (aero) or Narrow (-25 g). Model year: chart is undated on the brand sites; US product record created 2025-10-24, AU record created 2026-03-05, both live 2026-08-28; Bike Insights labels the same table "2025"; geometrygeeks has a "2025" entry citing quick-bikes.com.cn/product/26.html.
The table above is taken from the brand's own regional sites: https://www.quickprousa.com/products/er-one-frame ("QUICK PRO USA", table rows A-K plus STR/Reach/Stack) and it is IDENTICAL on https://quickproaus.com/products/er-one (QuickPro Australia, with geometry diagram https://quickproaus.com/cdn/shop/files/geometry-diagram.png). Source: html_table (brand regional site, "Size & Fit" table + geometry diagram image)
How I read the maker's table
Reprints checked: Ti-Parts (https://tipartstitanium.com/products/quick-pro-er-one-aero-road-bike-frameset, 5 sizes, same numbers, diagram https://cdn.shopify.com/s/files/1/0760/3503/1340/files/QuickProEROneGeometry.jpg), Panda Podium (https://www.pandapodium.cc/product/quick-pro-erone-aero-road-bike-frameset/, carries both a newer 6-size table identical to the brand table and an older 5-size table where XS wheelbase is 988 not 985 and sizes map to "equivalent" 49/52/54/56/58 cm), Bike Insights 2025 (same 6 sizes; it also lists DERIVED front centre 587.2/587.2/589.2/593.2/610.1/621 and trail 75.5/69.1/62.8/56.6/56.6/53.5 - computed by Bike Insights, not published by the brand, so left null). Geometrygeeks pages (quick-pro-erone-2025, quick-pro-er-one-2024) serve scrambled anti-scrape numbers to non-JS clients - do NOT use their values. Sizing guide (quickproaus.com): XS 155-165 cm, S 163-173, M 170-180, L 178-188, XL 185-196, XXL 193-203; Panda Podium height chart (5 sizes, image) roughly XS <160-166, S 166-172, M 172-178, L 178-184, XL 184-190. Frame: T1100 + M65 carbon monocoque, 840 g claimed (size M), T47 68 mm BB, flat mount, 12x100/12x142 thru axles, UDH, UCI approved.
