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 Most makers do not publish it, so I assume 10 mm and add 6 mm to the band beside every answer.
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 hands sit than your saddle. On a riser bar I count the bar's rise, so the drop is that much less than it is to the clamp.
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
Winspace T1550
Aero road · 5 sizes
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- Bike
- Winspace T1550 · Aero road · 5 sizes
- Geometry
- winspace.cc, from the Internet Archive's copy of 2025, fetched 22 Oct 2026, read off the maker's chart, re-checked, no differences
- Seat angle convention
- Calculated from Winspace's table
- Cockpit
- Generic stem and bar, assumed
- Solved with
- cover 10 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 · 879 bikes, 79 makes, 4,979 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 M 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 off the maker's page: winspace.cc, from the Internet Archive's copy of 2025- Tyre clearance
- 28 mm
- Bottom bracket
- BB86
- Axles and brakes
- not published
- UDH
- not published
- Seatpost
- proprietary aero post, included
- Frame weight
- 880 g, size M
- In the box
- frame, fork, seatpost, headset, Di2 cable stoppers, spare derailleur hanger
In the maker's words
Kept whole, as I read it off winspace.cc, from the Internet Archive's copy of 2025.Sold as a frameset (frame, fork, seatpost, headset, Di2 cable stoppers, spare derailleur hanger).
Cockpit and seatpost, in the maker's words · 95 words
Sold as a frameset (frame, fork, seatpost, headset, Di2 cable stoppers, spare derailleur hanger). Head tube "NO.55R 1.5"/ACR/STD (headset included.)": FSA ACR full-internal routing through a 1-1/2 in upper bearing; the 2023 page warned "The Zero Integrated Bar is NOT compatible with T1550", and Winspace later sold the "Winspace Zero SL Integrated Bar and Stem for T1550" (https://www.winspace.cc/products/winspace-zero-sl-integrated-bar-and-stem-for-t1550). No stem length or bar width per size, so stock_stem_length and stock_bar_width are null. Seatpost: "Proprietary Aero Seat Post (Included.)", setback 8 mm on XS to M and 17 mm on L and XL per the table.
OFFICIAL SOURCE, ARCHIVED: Winspace's own Shopify product page for the first T1550 frameset (the page Winspace kept after the T1550 2nd Gen arrived. Source: image_table (Internet Archive snapshot 2025-08-07 of the maker's product page; the table is the image under the page's "Geometry" heading
How I read the maker's table
winspace-t1550-gen2 is that later frame, a different table) as the Internet Archive captured it on 2025-08-07 (https://web.archive.org/web/20250807174827/https://www.winspace.cc/products/t1550-frameset). The frame is no longer on Winspace's live store (product sitemap fetched 22 Oct 2026); the archive holds the Shopify page from Apr to Nov 2025 and the WordPress page https://www.winspace.cc/product/t1550-frameset/ from May 2023, which says "The disc brake version may be shipped in May; While the rim brake version may be shipped at the end of June" (a 2023 launch). model_year 2025 is the year of the capture used. TABLE (one image, a letter drawing over a table, XS/S/M/L/XL): Seat Tube Length A 410/440/470/510/550; Stack B (drawn vertically from the BB centre to the head tube top); Reach C (horizontal to the head tube top); Top Tube Length D (drawn horizontal, recorded as top_tube_effective); Head Tube Length E; Wheelbase F; Chainstay Length G; BB Drop H; BB Height I 274 every size (not in the schema); Seat Tube Angle J (the XL cell prints "73.5" without its degree sign); Head Tube Angle K; Fork Length L 370 every size (not in the schema); Fork Rake M; Trail(28C) N (maker-published for a 28 mm tyre, kept; tyre_width_mm 28); Seatpost Length O 350/350/350/400/400 and Seatpost Setback P 8/8/8/17/17 (the proprietary aero post the frameset ships with, so each size carries posts [its setback]); Standover Height Q. "*All units are mm unless otherwise stated". The page's text gives sizes "XS (410mm), S (440mm), M (470mm), L (510mm), XL (550mm)". STACK on the XS is 502 and the S 507 (5 mm apart, where the other steps are 10 to 30): as printed, and it closes its own top tube (370 + 502 / tan 75.5 = 499.8 against 500). Bike Insights' T1550 2023 (citing the WordPress page) prints the XS stack 505 and standovers 685/705/750/770/785 against this table's 729/745/767/799/828: the 2023 page carried two geometry images (T1550_Geomtery.jpg and T1550_Geomtery_1.jpg) not yet read, because web.archive.org blocked this machine on 22 Oct 2026; a later pass should read them.
Source: image_table (Internet Archive snapshot 2025-08-07 of the maker's product page; the table is the image under the page's "Geometry" heading, https://cdn.shopify.com/s/files/1/0912/6101/0215/files/7_94095e30-f085-41c2-b1a8-a2693c6d3cb2.jpg?v=1753341158, 1161x2048 px, headed "T1550 Geometry"; read by eye, image NOT stored)
