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 Most makers do not publish it, so I assume 10 mm and add 6 mm to the band beside every answer.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
Orro Gold STC
Endurance road · 5 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
- Orro Gold STC · Endurance road · 5 sizes
- Geometry
- orrobikes.com, fetched 22 Oct 2026, read off the maker's chart, re-checked, no differences
- Seat angle convention
- Calculated from Orro'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. A dashed tube is a number the maker left out (est.).
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 from the maker's words, not a table: orrobikes.com- Tyre clearance
- not recorded yet
- Bottom bracket
- not recorded yet
- Axles and brakes
- not recorded yet
- UDH
- not recorded yet
- Seatpost
- proprietary
- Frame weight
- not recorded yet
In the maker's words
Kept whole, as I read it off orrobikes.com.ORRO Gold STC 2025 build on the page: Vision SMR alloy integrated stem with Vision Metron 4D handlebar, ORRO carbon aero seatpost; the chart prints no stem or bar sizes, so stock fields are null.
Cockpit and seatpost, in the maker's words · 35 words
ORRO Gold STC 2025 build on the page: Vision SMR alloy integrated stem with Vision Metron 4D handlebar, ORRO carbon aero seatpost; the chart prints no stem or bar sizes, so stock fields are null.
OFFICIAL SOURCE: Orro Bikes' own site (orrobikes.com). Source: image_table (official Orro product page "2025 Gold STC 105 Di2 Tailormade", the size chart image "Gold-Size-Chart-2024.jpg" read at full resolution; fetched 2026-10-22
How I read the maker's table
The product page "2025 Gold STC 105 Di2 Tailormade" (frame ORRO Gold STC Disc, fork ORRO Gold STC Superlight 2.0) links two images of one table: "Gold-Size-Chart-2024.jpg" (recorded) and "2024-Gold-STC-Geo-Chart.jpg" (the same numbers laid out for phones; the re-check). Planet X's "Orro Gold Geometry" page links the same 2024 chart. Five sizes XS to XL. Not printed: BB drop, fork offset, standover, front centre, trail, stem and bar (null); stack datum not stated (null). Model year: the chart is named 2024 and the page sells the 2025 bike; the listing on the fetch date, so model_year is null. Bike Insights holds a single M size for its Gold STC 2024 that matches this M, and a single L for its Gold STC 2022 (stack 582, reach 395, head angle 73) that is an earlier Gold STC frame (not written: one size only).
Source: image_table (official Orro product page "2025 Gold STC 105 Di2 Tailormade", the size chart image "Gold-Size-Chart-2024.jpg" read at full resolution; fetched 2026-10-22, HTTP 200)