Colnago G5-X Geometry: Compare Reach and Stack Across Five Sizes
Colnago G5-X geometry provides two coordinates that are more informative together than a size number alone. In the 510 column, reach is 392 mm and stack is 573 mm. The same column also lists a 100 mm default stem for the Rival build. That stem length is a different measurement, not an alternative reach figure.
Read Colnago G5-X geometry as paired coordinates
The manufacturer lists reach of 377, 385, 392, 401 and 411 mm across 450, 480, 510, 540 and 570. Stack progresses through 536, 555, 573, 591 and 613 mm. The standalone G5-X chart repeats those pairs under its shorter labels 45, 48, 51, 54 and 57.
Consider the two larger steps. Moving from 510 to 540 adds 9 mm of frame reach and 18 mm of stack. Moving from 540 to 570 adds 10 mm horizontally and 22 mm vertically. The increasing size numbers therefore do not describe equal changes in both directions.
Separate the frame from fitted contact points
The Colnago G5-X Bike — Carbon Blue listing identifies its colour as Carbon Blue. Retain that identity through the Blue listing when comparing a specific bicycle. A stem, handlebar and saddle help determine the finished riding position; the bare frame coordinates do not specify where every rider's hands and hips will end up.
The G5-X chart also keeps chainstay length at 435 mm in all five columns. That shared dimension does not erase the changing front-centre, reach or stack entries. Read a complete candidate column rather than treating one matching dimension as evidence that two frames are equivalent.
Keep the disputed row outside a confident calculation
The webpage gives 75 mm bottom-bracket drop for size 570, whereas the standalone size-guide row 57 gives 77.5 mm. That disagreement remains unresolved. It should not be averaged, silently corrected or used to claim a known difference in pedal clearance.
The older G3-X photograph offers gravel-family context, not a scale drawing. Its separate naming scheme cannot assign a G5-X column. Start with the Colnago collection and company guide, then bring the identified frame and complete cockpit into a fitting discussion.
FAQ
Is the listed stem length frame reach?
No. The table names them separately; 510 has 392 mm reach and a distinct stem entry.
Does every frame have the same stack?
No. The five published values rise from 536 to 613 mm.
Which final-size bottom-bracket drop is confirmed?
The inspected webpage and PDF disagree. Neither figure is treated here as a resolved replacement for the other.
Sources
Manufacturer pages and documents read 5 November 2026: G5-X geometry and build tables (https://www.colnago.com/en-us/products/g5-x-bike); G5-X geometry sheet (https://a.storyblok.com/f/263970/x/124d1510c3/scheda-a4-colnago-g5-x.pdf).
Photograph credits and permissions
Photograph 1
Original title: Colnago G3-X GRX Bike Black Silver
Creator: Glory Cycles; creator profile: https://www.flickr.com/people/glorycycles/
Copyright notice: No separate photograph copyright notice supplied. Embedded Display P3 colour-profile notice: Copyright Apple Inc., 2017.
Original source URI: https://www.flickr.com/photos/glorycycles/49680034286/
License / permission: CC BY 2.0
License / permission URI: https://creativecommons.org/licenses/by/2.0/
Modification notice: Original source-hosted JPEG retained byte for byte by this preparer. Source EXIF identifies an Apple iPhone XR, Software 13.3.1 and CompositeImage value 2. These metadata fields do not establish particular manual editing operations. No XMP packet or extended XMP header was found in the examined complete JPEG bytes or its JPEG metadata segments. No earlier editing history was supplied on the photo page.
Source disclaimer: No endorsement by Glory Cycles or Colnago is implied. No warranties are given; other rights may apply. The photo source identifies a G3-X and dates capture to 6 March 2020. It does not show a G5-X, either Carbon Blue or Carbon Green, and does not establish the configuration, geometry or manufacturing year of a current product.